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  • 1995-1999  (314,643)
  • 1950-1954  (8)
  • 1930-1934  (3)
  • 1997  (314,643)
Collection
Keywords
Publisher
Language
Years
Year
  • 1
    Unknown
    Proceedings of the Tenth World Conference on Earthquake Engineering : 19-24 July 1992, Madrid, Spain (1992-)
    Rotterdam [u.a.] : Balkema
    Details Availability
    Call number: M 92.0634
    ISBN: 9054100605
    Language: English
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Atmospheric dust and aerosol study : second status report (1977-)
    Garmisch-Partenkirchen : Institut für atmosphärische Umweltforschung der Fraunhofer- Gesellschaft
    Details Availability
    Call number: MOP 44829 / Mitte
    Type of Medium: Monograph available for loan
    Pages: 25 S. , graph. Darst.
    Language: English
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 3
    Monograph available for loan
    Monograph available for loan
    Quake : part two, the aftermath (1900-)
    [Edgecumbe, N.Z.] : A. Muller
    Details Availability
    Call number: M 15.89146
    Description / Table of Contents: An account of the results of the 2 March 1987 earthquake in the eastern Bay of Plenty and the aftermath's effects on the people and places on the Rangitaiki Plains
    Type of Medium: Monograph available for loan
    Pages: 223 S., , Ill.
    Language: English
    Branch Library: GFZ Library
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  • 4
    Monograph available for loan
    Monograph available for loan
    Zuwendungsrecht Zuwendungspraxis : Textsammlung, Kommentar und Rechtsprechungssammlung zum Recht der Zuwendungen und Subventionen der öffentlichen Hand mit Verfahrenshinweisen für die Behörden und Zuwendungsempfänger (1982-)
    Heidelberg : v. Decker
    Details Availability
    Call number: IASS 15.89494
    Type of Medium: Monograph available for loan
    Pages: Losebl.-Ausg.
    Edition: Stand: Oktober 2010
    ISBN: 9783768501828
    URL: Inhaltsverzeichnis
    Language: German
    Branch Library: RIFS Library
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  • 5
    Monograph available for loan
    Monograph available for loan
    Referativnyj žurnal : geologija, geografija (1982-)
    Moskva
    Details Availability
    Call number: MOP 19538/1d-6d
    Type of Medium: Monograph available for loan
    Pages: 111 S.
    ISSN: 0486-2287
    Language: Russian
    Note: In kyrill. Schr.
    Location: MOP - must be ordered
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  • 6
    Monograph available for loan
    Monograph available for loan
    Hans Stille (1876-1966) geologist (1978-)
    Stuttgart : Schweizerbart Science Publishers ; Volume 1, number 1 (1978)-
    Details Availability
    Call number: M 18.91571
    Type of Medium: Monograph available for loan
    Pages: 134 Seiten
    ISSN: 2363-7196
    Series Statement: Global tectonics and metallogeny : special issue Vol. 10/2-4
    Classification:
    Tectonics
    Parallel Title: Erscheint auch als Global tectonics and metallogeny
    Language: English
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 7
    Journal available for loan
    Journal available for loan
    FinanzArchiv : public finance analysis (1884-)
    Tübingen : Mohr Siebeck ; 1.1884 - 48.1931; N.F. 1.1932/33 - 10.1943/44(1945),3; 11.1948/49(1949) -
    Details
    Call number: ZS 22.95039
    Type of Medium: Journal available for loan
    Pages: Online-Ressource
    ISSN: 1614-0974 , 0015-2218 , 0015-2218
    URL: https://www.jstor.org/journal/finaarch
    URL: http://www.bibliothek.uni-regensburg.de/ezeit/?2143985
    URL: https://www.mohrsiebeck.com/zeitschrift/finanzarchiv-fa
    URL: https://www.jstor.org/journal/finaarch
    Language: German , English
    Note: N.F. entfällt ab 57.2000. - Volltext auch als Teil einer Datenbank verfügbar , Ersch. ab 2000 in engl. Sprache mit dt. Hauptsacht.
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    E-BOOK
  • 8
    Monograph available for loan
    Monograph available for loan
    Climatología aeronáutica de España (1948-)
    Madrid : Secc
    Details Availability
    Call number: PIK N 456-17-90913
    Type of Medium: Monograph available for loan
    Pages: 536 Seiten
    Series Statement: Ministerio de Transportes Turismo Y Comunicaciones : Publicación Serie A 114
    Parallel Title: 1,1=6; 2,1=13 von Publicaciones / D / Ministerio del Aire, Subsecretaria de Aviación Civil, Servicio Meteorológico Nacional
    Language: Spanish
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 9
    Monograph available for loan
    Monograph available for loan
    Osnovy učenija o počvennoj vlage : I.: Vodny svojstva počv i peredvizenie počvennoj vlagi (1965-)
    Leningrad : Gidrometeorolog. Izd.
    Details Availability
    Call number: MOP 33767
    Type of Medium: Monograph available for loan
    Pages: 663 S.
    Language: Russian
    Note: In kyrill. Schr., russ.
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 10
    Series available for loan
    Series available for loan
    Das Klima von Potsdam : Ergebnisse 60jähriger Beobachtungen am Meteorologischen Observatorium 1893-1952; [Textband] (1963-)
    Berlin : Reimer
    Associated volumes
    Details Availability
    Call number: AWI A3-20-93434
    In: Meteorologische Abhandlungen / Institut für Meteorologie und Geophysik der Freien Universität Berlin, Band XXXII, Heft 1
    Type of Medium: Series available for loan
    Pages: 121 Seiten , Illustrationen
    Series Statement: Meteorologische Abhandlungen / Institut für Meteorologie und Geophysik der Freien Universität Berlin 32,1
    Language: German
    Note: Zugleich: Dissertation, Freie Unversität Berlin, [ca. 1963] , INHALTSVERZEICHNIS PROBLEMSTELLUNG UND ZIELSETZUNG 1. BEMERKUNGEN ZUM BEOBACHTUNGSGELÄNDE UND ZUM BEOBACHTUNGSMATERIAL 1.1 Das Beobachtungsgelände 1.2 Das Beobachtungsmaterial 2. HOMOGENITÄTSBETRACHTUNGEN 2.1 Temperatur 2.2 Niederschlag 2.3 Wind 2.4 Sonnenschein und Bewölkung 3. TEMPERATURVERHÄLTNISSE 3.1 Monats- und Jahreswerte 3.2 Tageswerte 3.3 Pentadenwerte 3.4 Häufigkeitsbetrachtungen 3.5 Interdiurne Veränderlichkeit 3.6 Der tägliche Gang 3.7 Vorkommen bestimmter Schwellenwerte 3.71 Frost- und Eistage 3.72 Sommer- und Tropentage 4. DER WASSERGEHALT DER LUFT 4.1 Monats- und Jahreswerte 4.2 Tageswerte 4.3 Häufigkeitsbetrachtungen 4.4 Interdiurne Veränderlichkeit 4.5 Der tägliche Gang 5. BEWÖLKUNGSVERHÄLTNISSE 5.1 Monats- und Jahreswerte 5.2 Tageswerte 5.3 Häufigkeitsbetrachtungen 5.4 Der tägliche Gang 5.5 Heitere und trübe Tage 5.6 Nebel 6. SONNENSCHEIN 6.1 Monats- und Jahreswerte 6.2 Tageswerte 6.3 Der tägliche Gang 7. NIEDERSCHLAGSVERHÄLTNISSE 7.1 Monats- und Jahreswerte 7.2 Niederschlagsbereitschaft 7.3 Tageswerte 7.4 Der tägliche Gang 7.5 Häufigkeitsbetrachtungen 7.6 Niederschlags- und Trockenperioden 7.7 Niederschlag und Wind· 7.8 Schneeverhältnisse 7.81 Schneefall und Schneedecke 7.82 Schneehöhe 7.9 Gewitter 8. WINDVERHÄLTNISSE 8.1 Windrichtung 8.2 Windgeschwindigkeit 8.21 Der jährliche Gang 8.22 Häufigkeitsbetrachtungen 8.23 Sturmtage und Windstillen 8.24 Der tägliche Gang 9.ZUSAMMENFASSUNG VERZEICHNIS DER TEXTTABELLEN VERZEICHNIS DER ABBILDUNGEN LITERATURVERZEICHNIS TABELLENANHANG
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  • 11
    Series available for loan
    Series available for loan
    Das Klima von Potsdam : Ergebnisse 60jähriger Beobachtungen am Meteorologischen Observatorium 1893-1952; Tabellenanhang (1963-)
    Berlin : Reimer
    Associated volumes
    Details Availability
    Call number: AWI A3-20-93434-2
    In: Meteorologische Abhandlungen / Institut für Meteorologie und Geophysik der Freien Universität Berlin, Band XXXII, Heft 2
    Type of Medium: Series available for loan
    Pages: 218 Seiten , Illustrationen
    Series Statement: Meteorologische Abhandlungen / Institut für Meteorologie und Geophysik der Freien Universität Berlin 32,2
    Language: German
    Note: Zugleich: Dissertation, Freie Unversität Berlin, [ca. 1963] , INHALTSVERZEICHNIS PROBLEMSTELLUNG UND ZIELSETZUNG 1. BEMERKUNGEN ZUM BEOBACHTUNGSGELÄNDE UND ZUM BEOBACHTUNGSMATERIAL 1.1 Das Beobachtungsgelände 1.2 Das Beobachtungsmaterial 2. HOMOGENITÄTSBETRACHTUNGEN 2.1 Temperatur 2.2 Niederschlag 2.3 Wind 2.4 Sonnenschein und Bewölkung 3. TEMPERATURVERHÄLTNISSE 3.1 Monats- und Jahreswerte 3.2 Tageswerte 3.3 Pentadenwerte 3.4 Häufigkeitsbetrachtungen 3.5 Interdiurne Veränderlichkeit 3.6 Der tägliche Gang 3.7 Vorkommen bestimmter Schwellenwerte 3.71 Frost- und Eistage 3.72 Sommer- und Tropentage 4. DER WASSERGEHALT DER LUFT 4.1 Monats- und Jahreswerte 4.2 Tageswerte 4.3 Häufigkeitsbetrachtungen 4.4 Interdiurne Veränderlichkeit 4.5 Der tägliche Gang 5. BEWÖLKUNGSVERHÄLTNISSE 5.1 Monats- und Jahreswerte 5.2 Tageswerte 5.3 Häufigkeitsbetrachtungen 5.4 Der tägliche Gang 5.5 Heitere und trübe Tage 5.6 Nebel 6. SONNENSCHEIN 6.1 Monats- und Jahreswerte 6.2 Tageswerte 6.3 Der tägliche Gang 7. NIEDERSCHLAGSVERHÄLTNISSE 7.1 Monats- und Jahreswerte 7.2 Niederschlagsbereitschaft 7.3 Tageswerte 7.4 Der tägliche Gang 7.5 Häufigkeitsbetrachtungen 7.6 Niederschlags- und Trockenperioden 7.7 Niederschlag und Wind· 7.8 Schneeverhältnisse 7.81 Schneefall und Schneedecke 7.82 Schneehöhe 7.9 Gewitter 8. WINDVERHÄLTNISSE 8.1 Windrichtung 8.2 Windgeschwindigkeit 8.21 Der jährliche Gang 8.22 Häufigkeitsbetrachtungen 8.23 Sturmtage und Windstillen 8.24 Der tägliche Gang 9.ZUSAMMENFASSUNG VERZEICHNIS DER TEXTTABELLEN VERZEICHNIS DER ABBILDUNGEN LITERATURVERZEICHNIS TABELLENANHANG
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  • 12
    Monograph available for loan
    Monograph available for loan
    Agraratlas über das Gebiet der Deutschen Demokratischen Republik : Bodenarten und Bodenartliche Ertragsbedingungen (1956-)
    Gotha : Haack
    Details Availability
    Call number: (DE-599)GBV03709842X
    Type of Medium: Monograph available for loan
    Language: German
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 13
    Electronic Resource
    Electronic Resource
    A measurement of τ polarization in Z^0 decays (1992-8977)
    Amsterdam : Elsevier
    Physics Letters B 294 (1992), S. 466-478 
    Details
    ISSN: 0370-2693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0370-2693(92)91549-O
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    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    Measurement of the average lifetime of b hadrons (1993-4325)
    Amsterdam : Elsevier
    Physics Letters B 317 (1993), S. 474-484 
    Details
    ISSN: 0370-2693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0370-2693(93)91027-K
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  • 15
    facet.materialart.
    Unknown
    Abhandlungen der Geologischen Bundesanstalt in Wien (1925-2022)
    Wien : [Verlag nicht ermittelbar] ; 22.1910/25(1925),3; 23.1914/31(1929/31),2-3; 24.1927,1-2; 25.1939,1; 26.1948,1; 27.1971-Band 76 (2022)
    Details Availability
    Call number: S 91.1179
    ISSN: 0375-5797 , 0378-0864
    Parallel Title: 35=2 von European Conodont Symposium (ZDB) Guidebook, abstracts / European Conodont Symposium
    Parallel Title: 41=2 von Workshop on Agglutinated Foraminifera (ZDB) Proceedings / Workshop on Agglutinated Foraminifera. Geologische Bundesanstalt
    Parallel Title: 39=3 von International Nannoplankton Association Proceedings of the ... International Nannoplankton Association conference
    Parallel Title: 60=11 von Deutsche Gesellschaft für Geowissenschaften. Fachsektion GeoTop Internationale Jahrestagung der Fachsektion GeoTop der Deutschen Gesellschaft für Geowissenschaften
    Former Title: Vorg. Geologische Reichsanstalt Abhandlungen der Kaiserlich-Königlichen Geologischen Reichsanstalt, Wien
    Subsequent Title: Fortgesetzt durch Abhandlungen
    Language: German
    Branch Library: GFZ Library
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  • 16
    Map available for loan
    Map available for loan
    Rust; 78. 1:50 000 (1993-2010)
    Associated volumes
    Details Availability
    Call number: K 95.0020 / R6
    In: Geologische Karte der Republik Österreich
    Type of Medium: Map available for loan
    Pages: 1 Kt. : mehrfarb. ; 54 x 82 cm, gefaltet 12 x 21 cm + Erl.-H. (192 S., 2010) im Umschlag
    ISBN: 9783853160558
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 17
    facet.materialart.
    Unknown
    UFZ-Bericht (1994-2006)
    Leipzig ; Nachgewiesen 1994 - 2006
    Details Availability
    Call number: SR 90.1139
    ISSN: 0948-9452
    Parallel Title: 1996,5=1; 1996,6=2; 1996,8=3; 1996,9=4; 1996,10=5; 1996,11=6; 1996,12=7; 1996,16=8; 1996,18=9; 1996,20=10; 1997,2=11; 1997,7=12; 1997,16=13; 1997,25=14; 1998,9=15; 1998,14=16; 1998,19=17; 1999,4=19; 1999,18=23; 2000,8=26; 2000,10=27; 2001,18=31; 2002,5=32; 2002,21=33; 2003,2=35; 2003,17=36 von ---〉 Stadtökologische Forschungen
    Parallel Title: 2005,1=1 von ---〉 Basic and applied dryland research
    Subsequent Title: Forts. ---〉 Helmholtz-Zentrum für Umweltforschung 〈Leipzig〉: UFZ-Bericht
    Branch Library: GFZ Library
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  • 18
    Non-book medium
    Non-book medium
    South Africa = Suid-Afrika [Elektronische Ressource] 1:250 000 (1996-2004)
    Associated volumes
    Details Availability
    Call number: NBM 09.0423
    In: South Africa = Suid-Afrika
    Type of Medium: Non-book medium
    Pages: 1 DVD (71 Blätter, Indexblätter : TIF-Bilder)
    Series Statement: South Africa = Suid-Afrika
    Location: Reading room
    Branch Library: GFZ Library
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  • 19
    Series available for loan
    Series available for loan
    Small publications in historical geophysics : No. 1 - 12 (1995-2003)
    [Sund], Aland Islands : Summer Inst. for Historical Geophysics
    Associated volumes
    Details Availability
    Call number: S 97.0296(1-12)
    In: Small publications in historical geophysics
    Type of Medium: Series available for loan
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 20
    Series available for loan
    Series available for loan
    Geologičeskoe izučenie i ispolzovanie nedr : naučno-techničeskij informacionnyj sbornik ; Vypusk 2 (1996-2003)
    Moskva : ZAO "Geoinformmark"
    Details Availability
    Call number: AWI G1-19-92229
    Type of Medium: Series available for loan
    Pages: 61 Seiten , Illustrationen
    ISSN: 0868-4502
    Language: Russian
    Note: In kyrillischer Schrift
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 21
    facet.materialart.
    Unknown
    ANARE research notes (1982-2002)
    Kingston ; 1.1982 - 105.2002; damit Ersch. eingest.
    Details Availability
    Call number: ZSP-124
    ISSN: 0729-6533
    Parallel Title: 48=1987; 69=1988; 88=1992 von Australian upper atmospheric and space physics research in Antarctica
    Parallel Title: 80=1991 von Australian upper atmospheric and magnetospheric physics research in Antarctica
    Parallel Title: 92=1993 von Australian auroral and space physics research in Antarctica
    Parallel Title: 95=1994/95 von Australian atmospheric and space physics research in Antarctica
    Branch Library: GFZ Library
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  • 22
    facet.materialart.
    Unknown
    Stockholm contributions in geology (1957-2002)
    Stockholm : Almquist & Wiksell ; 1.1957/58 - 47.2002; damit Ersch. eingest.
    Details Availability
    Call number: SR 90.1145
    ISSN: 0585-3532
    Series Statement: Acta Universitatis Stockholmiensis
    Branch Library: GFZ Library
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  • 23
    Non-book medium
    Non-book medium
    South Africa = Suid-Afrika [Elektronische Ressource] 1:50 000 (1980-2002)
    Pretoria : Director of Surveys and Mapping
    Associated volumes
    Details Availability
    Call number: NBM 09.0425/6 (3317-3424) ; NBM 09.0425/5 (3030-3229) ; NBM 09.0425/4 (2831-3029) ; NBM 09.0425/3 (2727-2830) ; NBM 09.0425/2 (2531-2726) ; NBM 09.0425/1 (Index, 2221-2530)
    In: South Africa = Suid-Afrika
    Type of Medium: Non-book medium
    Pages: 6 DVD (1875 Blätter, Indexblatt: TIF-Bilder)
    Edition: Versch. Ausg.
    Series Statement: South Africa = Suid-Afrika
    Location: Reading room
    Location: Reading room
    Location: Reading room
    Location: Reading room
    Location: Reading room
    Location: Reading room
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: GFZ Library
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  • 24
    Monograph available for loan
    Monograph available for loan
    Understanding map projections (1994-2002)
    Redlands, California : ESRI
    Associated volumes
    Details Availability
    Call number: 1.10/M 04.0051/1
    In: ArcGis concept guides - bundle
    Type of Medium: Monograph available for loan
    Pages: v, 110 S.
    ISBN: 1589480031
    Series Statement: ArcGIS 8 concept guides - bundle
    Classification:
    Cartography, Geographical Information Systems, GIS
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 25
    Series available for loan
    Series available for loan
    Mitteilungen zur Kieler Polarforschung; Nr. 9 - 16 (1994-2000)
    Associated volumes
    Details Availability
    Call number: ZSP-557(9-16)
    In: Mitteilungen zur Kieler Polarforschung
    Type of Medium: Series available for loan
    Pages: Getr. Zählung
    Branch Library: AWI Library
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  • 26
    facet.materialart.
    Unknown
    Skrifter (1948-2000)
    Oslo : Univ. Press [in Komm.] ; Nr. 90.1948 - 201.2000
    Details Availability
    Call number: ZSP-597
    Parallel Title: 123=1; 131=6; 133=9; 155=11 von Den Norske Antarktisekspedisjonen 〈1956 - 1960〉: Scientific results / den Norske Antarktisekspedisjonen, 1956 - 1960
    Former Title: Vorg. ---〉 Norges Svalbard- og Ishavs-Undersøkelser: Skrifter / Norges Svalbard- og Ishavsundersøkelser
    Subsequent Title: Aufgeg. in: ---〉 Norsk Polarinstitutt 〈Oslo〉: Rapportserie / Norsk Polarinstitutt
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  • 27
    Monograph available for loan
    Monograph available for loan
    Ozone data for the world : catalogue of ozone stations and ozone data; Index (1968-2000)
    Downsview, Ont ; Nachgewiesen Nr. 4.1968 - 33.1998(2000)
    Details Availability
    Call number: MOP Per 590
    Type of Medium: Monograph available for loan
    ISSN: 0030-7777
    Subsequent Title: Forts. ---〉 Ozone data for the world
    Location: MOP - must be ordered
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  • 28
    facet.materialart.
    Unknown
    Meddelelser (1949-2000)
    Oslo ; 68.1949 - 160.2000
    Details Availability
    Call number: ZSP-598
    Parallel Title: 968979-5 106=12 von ---〉oeFridtjof Nansen minneforelesninger
    Parallel Title: 1413132-8 141=3 von ---〉oeEuropean Environment Agency: EEA environmental monograph
    Parallel Title: 1500339-5 140=1993/94; 148=1996/97; 156=1997/98 von ---〉oeReport of the Norwegian Antarctic research expedition
    Former Title: 980569-2 Vorg. ---〉oeNorges Svalbard- og Ishavs-Undersøkelser: Meddelelse
    Subsequent Title: 1140571-5 Aufgeg. in: ---〉oeNorsk Polarinstitutt 〈Oslo〉: Rapportserie
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  • 29
    facet.materialart.
    Unknown
    Proceedings of the ocean drilling program; Scientific results (1988-2000)
    College Station, Tex. ; 101/102.1985(1988) - 168/169-S.1996(2000)
    Details Availability
    Call number: ZSP-607/SR
    ISSN: 0884-5891
    Former Title: Vorg.: Initial reports of the Deep Sea Drilling Project
    Subsequent Title: Internetausg. u. Forts.: ODP proceedings / Scientific results
    Subsequent Title: CD-ROM-Ausg. u. Forts.: Proceedings of the ocean drilling program / Scientific results
    Note: CD-ROM-Suppl. mit teils elektronischen Versionen der jeweil. Druckausgaben und teils zusätzlichen Daten; ungezählte Mikrofiche-Beil. , 97 - 100 nicht ersch.
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  • 30
    Monograph available for loan
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    Contributions to atmospheric physics : a publication of the Deutsche Meteorologische Gesellschaft (1969-1999)
    Braunschweig [u.a.] : Vieweg ; 42.1969 - 72.1999
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    Call number: MOP Per 319
    Type of Medium: Monograph available for loan
    ISSN: 0005-8173 , 0303-4186
    Former Title: Vorg. ---〉 Beiträge zur Physik der Atmosphäre
    Subsequent Title: Forts. ---〉 Meteorologische Zeitschrift
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  • 31
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    Berichte aus dem Fachgebiet Physik (1990-1999)
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    Call number: ZSP-189
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    Annual report (1969-1999)
    Stockholm : Inst. ; 1967/68(1969) - 1998(1999)
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    Call number: MOP Per 603
    Type of Medium: Monograph available for loan
    ISSN: 0349-0068
    Subsequent Title: Forts. ---〉 Internationella Meteorologiska Institutet 〈Stockholm〉: Biennial report
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    ECMWF re-analysis project report series (1997-1999)
    Reading ; 1.1997 - 8.1999; damit Ersch. eingest.
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    Call number: ZSP-253
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    Antarktika : doklady komissii (1961-1998)
    Moskva : Akad. ; [1.]1960(1961) - [10.]1969(1971); 11.1972 - 34.1998
    Details Availability
    Call number: ZSP-138
    ISSN: 0570-2844 , 0134-4781
    Parallel Title: 19=1 von--〉 Soveščanie po Istorii Oledenenija Antarktidy : Soveščanie po Istorii Oledenenija Antarktidy
    Subsequent Title: Forts.--〉 Arktika i Antarktika
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    Monatlicher Witterungsbericht : Amtsblatt des Deutschen Wetterdienstes (1953-1998)
    Offenbach ; 1.1953 - 46.1998
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    Call number: MOP Per 120
    Type of Medium: Monograph available for loan
    ISSN: 0435-7965 , 0373-756X
    Parallel Title: Beil. ---〉 Agrarmeteorologischer Monatsbericht für Baden-Württemberg
    Former Title: Vorg. ---〉 Witterungsbericht
    Former Title: Vorg. ---〉 Monatlicher Witterungsbericht für die Britische Zone
    Former Title: Vorg. ---〉 Witterungsberichte für Nordbaden
    Subsequent Title: Forts. ---〉 [Witterungsreport / Daten]
    Subsequent Title: Forts. ---〉 [Witterungsreport / Jahresausgabe]
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    Berichte aus dem Sonderforschungsbereich 313, Veränderungen der Umwelt - Der Nördliche Nordatlantik (1991-1998)
    Kiel ; 28.1991 - 75.1998; damit Ersch. eingest.
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    Call number: ZSP-167
    ISSN: 0179-1397 , 0942-119X
    Former Title: Vorg. ---〉 Sonderforschungsbereich Sedimentation im Europäischen Nordmeer 〈Kiel〉: Berichte aus dem Sonderforschungsbereich 313 "Sedimentation im europäischen Nordmeer"
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    Wissenschaftliche Mitteilung (1953-1998)
    München : Meteorolog. Inst. der Ludwig-Maximilians-Univ. ; H. 1.1953 - 73.1998; damit Ersch. eingest.
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    Call number: ZS-161 ; MOP Per 737
    Type of Medium: Monograph available for loan
    ISSN: 0463-9707
    Parallel Title: 7=1; 8=2; 10=3; 11=4; 13=5; 14=6; 16=7; 18=8; 20=9 von Meteorologische Station 〈München〉: Aus den Arbeiten der Meteorologischen Station beim Forschungsreaktor München
    Parallel Title: 58=2 von Arbeitskreis Humanbiometeorologie: Treffen / Arbeitskreis Humanbiometeorologie
    Parallel Title: 61=1988 von Fachtagung Umweltmeteorologie: Fachtagung Umweltmeteorologie / Arbeitskreis Umweltmeteorologie, AKUMET, Deutsche Meteorologische Gesellschaft ; Universität München, Meteorologisches Institut
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    Proceedings of the ocean drilling program; Initial reports (1988-1998)
    Washington, DC ; 112.1986(1988) - 175.1997(1998)
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    Call number: ZSP-608/IR
    ISSN: 0884-5883
    Former Title: Vorl.: Proceedings of the ocean drilling program / A
    Subsequent Title: Internetausg. u. Forts.: ODP proceedings / Initial reports
    Subsequent Title: Forts.: Proceedings of the ocean drilling program / Initial reports
    Note: Darin ungezählte CD-ROM-Suppl. mit teils elektron. Versionen der jeweil. Druckausgaben u. teils zusätzlichen Daten; ungezählte Mikrofiche-Beil.
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  • 39
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    CSIRO Division of Atmospheric Research technical paper (1990-1998)
    Melbourne : CSIRO
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    Call number: MOP Per 301/C
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    European Stratospheric Monitoring Stations in the Arctic II : an european contribution to the Network for the Detection of Stratospheric Change (NDSC) 1996-1998 (1996-1998)
    Potsdam
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    Call number: A12-99-0321
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  • 41
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    Meteorologische Abhandlungen; Serie B, Grundlagenmaterial (1975-1998)
    Berlin : Reimer
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    Call number: MOP Per 701/B
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  • 42
    Electronic Resource
    Electronic Resource
    Exact order reduction method in mode conversion problems (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3129-3140 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The exact order reduction method solves the fourth-order system of equations from the Vlasov equations that describe mode conversion by breaking the solution into two steps. The first step is to find the numerical solutions of a pair of second-order equations for the fast waves and slow waves, respectively, which are easily obtained. The second step uses an associated integral equation to obtain the coupling between the fast and slow waves. Potential difficulties due to singularities in the kernel of the integral equations near the axis are resolved by altering the integration path. This allows accurate estimates for mode conversion efficiencies in realistic geometries as the integral equation is solved only in a narrow region near resonance, while the global fast wave solution of the reduced second-order equation covers the entire cross section. The method makes virtually no approximations except that it keeps only the lowest nontrivial order terms in the Larmor radius expansion. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872452
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  • 43
    Electronic Resource
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    Turbulization of nonlinear Langmuir oscillations in a cold plasma (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3200-3203 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown that the electric field of Langmuir oscillations in a cold plasma contains a component, independent of time, setting ions in motion. Using Lagrange variables, one-dimensional dynamics of plasma in respect to the interaction between electron oscillations and ion movement is investigated. As a consequence of this interaction, the crossing of electron trajectories occurs even at small amplitudes at time tc, i.e., one-dimensional turbulence appears in the system. The expression for tc is derived. In time tc ion displacements as well as ion energy are found to depend only on the electron–ion mass relationship. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872460
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  • 44
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    The bootstrap current in a tokamak with electron cyclotron heating (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3211-3216 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The bootstrap current in a non-Maxwellian tokamak plasma with electron cyclotron heating is calculated. The calculation is exact in the limit of highly charged ions, where pitch-angle scattering dominates over quasilinear diffusion, and shows that the current is entirely determined by the pressure of the trapped electrons. If the ion charge is finite, the current is shown to consist of two terms: one driven by collisions, and one driven by the heating and losses. The former is calculated approximately by using a model collision operator, and is found to be determined by the distribution of trapped electrons alone; the latter is discussed qualitatively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872462
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  • 45
    Electronic Resource
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    Anomalous width variations for ion acoustic rarefactive solitary waves in a warm ion plasma with two electron temperatures (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3204-3210 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Anomalous width–amplitude variations were observed in large amplitude rarefactive solitary waves which show increasing width with increasing amplitude, contrasting the usual reciprocal relation between the square of the width and the amplitude, beyond a certain value of the plasma parameters [S. S. Ghosh, K. K. Ghosh, and A. N. Sekar Iyengar, Phys. Plasmas, 3, 3939 (1996)]. For the limiting maximum amplitude, the "increasing width" solitary wave tends to a double layer-like solution. The overall variation was found to depend crucially on the specific parameter space. From a detailed investigation of the above behavior, a plausible physical explanation has been presented for such increases in the width. It is found that the ions' initial kinetic energies and the cold electron concentration within the perturbed region play a significant role in determining the observed width–amplitude variation. This contradicts the investigation of Sayal, Yadav, and Sharma [Phys. Scr. 47, 576 (1993)]. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872461
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  • 46
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    Aspect ratio scaling of toroidal plasma equilibria and the tokamak bootstrap effect (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3254-3261 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The aspect ratio scaling of toroidal plasma equilibria is examined using a parametrization of an exact Solov'ev solution to the Grad–Shafranov equation in Boozer coordinates. The equilibrium analysis suggests that simultaneous enhancements in magnetohydrodynamic (MHD) stability and the bootstrap effect are possible in tight aspect ratio (A→1) tokamaks. The fundamental physical mechanism causing the enhancements is shown to be the natural increase of the MHD safety factor q in tight aspect ratio toroidal geometries. The results of the scaling model suggest that the lowest bootstrap current fractions are obtained in tokamaks with aspect ratios A(approximate)3. It is also shown that a tight aspect ratio bootstrapped tokamak can be a weakly paramagnetic device. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872410
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  • 47
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    Resistive pressure gradient-driven turbulence at stellarator plasma edge (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3282-3292 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High resolution calculations of resistive pressure gradient-driven turbulence for the plasma edge parameters of the Advanced Toroidal Facility (ATF) [J. F. Lyon et al., Fusion Technol. 10, 179 (1986)] electron cyclotron heated discharges give fluctuation levels, consistent with the experimental measurements. This turbulence model is also used to simulate the transition from the low confinement to the high confinement mode. The transition is triggered through the poloidal flow amplification induced by the Reynolds stress. After the transition, the confinement improvement is relatively low (30%–40%), even for unrealistically low poloidal viscosity. In the high confinement mode, the characteristic radial scale length of the poloidal flow in the three-dimensional calculations (separation between the lowest-n resonant surfaces) is different from the single helicity results (radial correlation length of the fluctuations). The simple criterion based on the ratio of shearing rate to the linear growth rate does not quantitatively account for the fluctuation reduction. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872469
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  • 48
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    Extended neoclassical transport theory for incompressible tokamak plasmas (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3320-3322 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Conventional neoclassical transport theory is extended to include the effects of orbit squeezing, and to allow the effective poloidal Mach number UpM=[(V(parallel)/vt)+(VEB/vtBp)] of the order of unity for incompressible tokamak plasmas. Here, V(parallel) is the parallel mass flow, vt is the ion thermal speed, VE is the poloidal E×B drift speed, B is the magnetic field strength, and Bp is the poloidal magnetic field strength. It is found that ion thermal conductivity is reduced from its conventional neoclassical value in both banana and plateau regimes if UpM〉1 and S〉1. Here, S=[1+cI2Φ′′/(Ω0B0)] is the orbit squeezing factor with c the speed of light, I=RBt, R the major radius, Φ the electrostatic potential, B0 the magnetic field strength on the axis, Ω0=eB0/Mc, M the ion mass, e the ion charge, Φ′′=d2Φ/dψ2, and ψ the poloidal flux function. However, there is an irreducible minimum for the ion thermal conductivity in the banana-plateau regime set by the conventional Pfirsch–Schlüter transport. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872472
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    Studies of instability and transport in sheared-slab plasmas with very weak magnetic shear (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3334-3340 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ion temperature gradient (ITG or ηi) driven microinstabilities are studied, using kinetic theory, for tokamak plasmas with very weak (positive or negative) magnetic shear (VWS). The gradient of magnetic shear as well as the effects of parallel and perpendicular velocity shear (v(parallel)′ and vE′) are included in the defining equations. Two eigenmodes: the double (D) and the global (G) are found to coexist. Parametric dependence of these instabilities, and of the corresponding quasilinear transport is systematically analyzed. It is shown that, in VWS plasmas, a parallel velocity shear (PVS) may stabilize or destabilize the modes, depending on the individual as well as the relative signs of PVS and of the gradient of magnetic shear. The quasilinear transport induced by the instabilities may be significantly reduced with PVS in VWS plasmas. The vE′ values required to completely suppress the instabilities are much lower in VWS plasmas than they are in normal plasmas. Possible correlations with tokamak experiments are discussed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872474
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  • 50
    Electronic Resource
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    Effect of a wiggler on two-stream instability (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3380-3381 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In a plasma-filled free electron laser two-stream instability is a serious consideration. The growth rate of the instability could be significantly reduced by coupling it to the electromagnetic modes/quasimodes through the wiggler. The effect is important near wiggler plasma resonance, where plasma frequency equals the product of wiggler wave number and beam velocity. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872478
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    A high-efficiency free-electron laser-peniotron hybrid with a longitudinal wiggler magnetic field (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3390-3393 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Stimulated emission from the interaction of a cold, relativistic beam of electrons gyrating in a combined solenoidal and longitudinally polarized periodic wiggler magnetic field is considered as a source of high-efficiency and short-wavelength radiation. The analysis of electron motion in such a combined field shows the motion covers rich Fourier components. The first Fourier component, with the cyclotron frequency of ωc+kwv(parallel), has relatively large transverse velocity compared with the velocity of the motion. The study of the interaction of this Fourier component with the peniotron electromagnetic mode indicates that a high efficiency of 36% is obtained. Its working mechanism is explained and the influence of the wiggler field on the saturation efficiency is analyzed. The electron bunching in the transverse plane and the evolution of the efficiency with the interaction distance is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872480
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    Fishbone mode excitation in the ion kinetic regime (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2785-2787 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: By solving the dispersion relation in the ion kinetic regime, it is found that the threshold of the plasma beta value for exciting the ion-fishbone mode is lowered. Thus, for most of the present-day tokamaks where the Bussac criterion [Bussac et al., Phys. Rev. Lett. 35, 1638 (1975)] is not satisfied, it will still be possible to excite the ion-fishbone mode. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872445
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  • 53
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    Production of sheared flow during ion cyclotron resonance heating in tokamak plasmas (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2788-2790 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An approach of producing the poloidal ion rotation by using ion cyclotron resonance heating (ICRH) is presented in core tokamak plasmas. The mechanism employed here is inducing a poloidal density inhomogeneity by rf cyclotron heating and then destabilizing the anomalous Stringer spin-up. A criterion for destabilization of the poloidal ion rotation in the presence of a rf wave is given, which depends on the ratio of the characteristic time of inhomogeneous density formation to the ion collision time. The numerical results have shown that the poloidal ion rotation can be destabilized in the present ICRH power level. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872446
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  • 54
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    Rarefactive ion acoustic soliton excitation using a modulated high-frequency sinusoidal wave in a negative ion plasma (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2893-2898 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experiments on the excitation of rarefactive ion acoustic solitons using a fine mesh grid in a negative ion plasma are described. The excitation is novel in that a modulated high-frequency sinusoidal wave voltage signal is applied to the grid. An interpretation of the velocity modulation and bunching of free-streaming ions that pass through the grid to which the signal is applied is given. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872420
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    Description of turbulent transport in tokamaks by invariants (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2907-2919 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In general, turbulent transport drives a plasma toward a state of turbulent equipartition, in which Lagrangian invariants are uniformly distributed. Different invariants decay with different rates, and in tokamaks the frozen-in law of particles in the poloidal magnetic field survives longer than the corresponding law for the toroidal field, assuming that the trapped particles dominate the turbulent transport. Therefore, the plasma profiles depend on the safety factor q(r), and the condition for convection of trapped particles is that the shear dq/dr is positive. There are two ways to suppress this convection and thereby enhance confinement. The first one is to reverse the magnetic shear. The energy of typical trapped particles then increases outward instead of inward, which suppresses instabilities. The second method is to eliminate the trapped ions by poloidal rotation, and thereby create a transport barrier. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872422
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    Studies of transport scaling and reduction under feedback (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2933-2939 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A feedback control system using an ion beam as a remote suppressor has been previously shown to be very effective in suppressing plasma instabilities in the Columbia Linear Machine [G. A. Navratil et al., Plasma Phys. 24, 184 (1982)]. The first experimental measurements for the effect of this feedback system on anomalous particle transport, as determined from the cross-correlation of density and potential fluctuations is presented. It is shown that feedback reduces transport due to a rotational E×B mode by up to a factor of 3 in this experiment. Also, it was found that particle transport scales linearly with fluctuation amplitude and feedback control does not alter this scaling. Last, the experimentally observed scaling of particle transport does not agree with any theoretical predictions. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872425
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    Role of finite parallel wave number in low frequency fluctuations in toroidal current less plasma (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2955-2961 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper we present results related to studies of low frequency electrostatic fluctuations in a toroidal plasma of varying length and without a toroidal current. The toroidal length of plasma is varied from fully toroidal (major radius R=45 cm) to 278, 212 and 142 cm. The characteristics of fluctuations changed, showing the effect of finite system length on the nature of the fluctuations. The major results are (1) a drastic reduction in the amplitude of fluctuations, (2) this reduction is mainly due to the disappearance of coherent peaks at 3 kHz and its harmonics observed in unbounded system, (3) the presence of a broad coherent feature around 10 kHz, only in bad curvature region, at low magnetic field (200 G) and (4) the appearance of a large number of coherent peaks, in one particular system length, at a higher magnetic field (400 G). These results indicate that the Rayleigh–Taylor instability with finite k|| may be excitable in the device. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872428
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    Signatures of deuterium recombination in the DIII-D divertor (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2989-2996 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thomson scattering measurements performed in the divertor of the DIII-D tokamak [Plasma Physics Controlled Nuclear Fusion Research, 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. I, p. 159] during detached operation show that the electron temperatures are typically between 0.8 and 2.0 eV throughout a region which may extend several centimeters above the target plate. At such low temperatures the excitation of recycling deuterium atoms or impurities should be weak. Nevertheless, significant radiation is frequently detected in these locations. It has been suggested that recombination processes, which become important only below about 1.5 eV for deuterium, are responsible for the observed emission. This hypothesis has been investigated by comparing ratios of deuterium lines from attached and detached plasmas with theoretical ratios expected for ionizing or recombining conditions. The analysis of several discharges indicates that the mechanism for production of the emission changes from being collisional excitation of atomic deuterium to a mixture of collisional-radiative recombination and collisional excitation as plasmas evolve from attached to detached states. Localization of D-α emission to low-temperature regions using tangentially viewing camera data together with Thomson scattering results and measurements of deuterium atom temperatures are consistent with these conclusions. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872432
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    High-intensity illumination of an exploding foil (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3006-3011 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In an experiment relevant to the fast ignitor fusion concept, a preformed plasma simulating the corona of a fusion target has been probed with laser intensities exceeding 1018 W/cm2. It is seen that the f number of the probe beam is increased as it propagates through the target plasma—a channeling of the power. The transmission and backscatter of the probe beam have been examined, and the analysis suggests anomalous absorption of laser light in shorter scale length plasmas. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872435
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    Signatures of target performance and mixing in titanium-doped, laser-driven target implosions (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3021-3030 
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    ISSN: 1089-7674
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    Topics: Physics
    Notes: Absorption-spectroscopy measurements using an embedded titanium layer have been performed on laser implosions of spherical shells. Predicted absorption features formed by the titanium layer were observed: absorption lines due to 1s–2p transitions in titanium ions of incomplete L shell, as well as K-edge absorption in cold titanium. Also observed were oscillations due to EXAFS (Extended X-Ray Absorption Fine Structure) above the Ti K edge. The core temperature and shell areal density and temperature are derived from the measurements and are found to fall short of the values predicted by one-dimensional code simulations. This shortfall is attributed to the lack of irradiation symmetry, which leads to hydrodynamic instability and mixing (smoothing by phase plates was not used in this experiment). Signatures of mixing include the emission of the He-α line of Ti+20 due to titanium migrating to the core, as well as the EXAFS spectrum indicating cold titanium close to peak compression.
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    URL: http://dx.doi.org/10.1063/1.872443
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    Particle-in-cell (PIC) simulations of beam instabilities in gyrotrons (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3043-3048 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Extensive simulations are performed to investigate effects of electron cyclotron instabilities on the gyrotron beam quality, using two-dimensional axisymmetric particle-in-cell (PIC) codes. Both electrostatic and electromagnetic models, as well as realistic geometries of the gyrotron, are considered. It is found that a large beam density can lead to an electrostatic-instability-induced energy spread which substantially degrades the gyrotron efficiency. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872439
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    Confinement of a neutral plasma using nested electric potential wells (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2313-2315 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A self-consistent, two-dimensional analysis is presented on confining a region of neutral plasma with a Penning/Malmberg type plasma trap using a nested well configuration. It is found that a neutral plasma region having disparate electron and ion temperatures or having high charge state ions can be confined with static fields. For confining a neutral region comprised of electrons and equal temperature low charge state ions, a quasistatic approach appears promising. © 1997 American Institute of Physics.
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    Linear stability of the collisionless, large Larmor radius Z-pinch (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2322-2330 
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    Topics: Physics
    Notes: The Vlasov fluid model is used to study the m=0 and m=1 internal and free boundary modes in a collisionless, large Larmor radius Z pinch. Two methods (initial value and variational) are employed, and give good agreement. The growth rate can be reduced from its zero Larmor radius value by a factor of up to 10 for m=1, and up to 3 for m=0. Stability thresholds and the role of resonant ions are discussed. © 1997 American Institute of Physics.
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    Impulsive and transient excitation of Bohm–Gross waves in a dissipative plasma (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2336-2347 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Based on the resolution of the partial differential equation describing the external excitation of the Bohm–Gross longitudinal wave, analytical expressions for causal responses of a dissipative macroscopic plasma are derived. Both impulsive and harmonic solutions representing the spatial Green's functions of the radiation problem are given. These exact responses of the plasma, expressed in terms of two-variable Lommel functions, are then used to gain some better understanding of the excitation and dynamics of the well-known thermal wave. Special attention is paid to the resonant excitation case. Intrinsic characteristics of the secular behavior of the radiated signal are illustrated and analyzed. It is shown that the proffered algebraic solutions constitute a generalization of previous results inferred from an asymptotic representation of the Green's functions, or from the familiar steady state harmonic approach. © 1997 American Institute of Physics.
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    Ion acoustic soliton excitation using a modulated high-frequency sinusoidal wave (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2436-2442 
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    Topics: Physics
    Notes: Experiments on the excitation of ion acoustic solitons using a fine mesh grid in a normal two component plasma are described. The excitation is novel in that a modulated high-frequency sinusoidal wave voltage signal is applied to the grid. The carrier frequency of the high-frequency sinusoidal wave is above the ion plasma frequency. An interpretation of the velocity modulation and bunching of free streaming ions that pass through the grid to which the signal is applied is given. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872224
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    Numerical observation of turbulence enhanced growth rates (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2508-2518 
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    Source: AIP Digital Archive
    Topics: Physics
    Notes: An enhancement of the velocity diffusion over the quasilinear value is observed in the regime where the autocorrelation time is much smaller than the linear growth time or resonance broadening time. The diffusion enhancement occurs when the resonance broadening time is small compared with the linear growth time. These simulations are self consistent and have enough modes to be in the continuous spectrum limit. That is, even at the initial amplitudes the intermode spacing is sufficiently small that the resonance overlap parameter is large. A possible mechanism for the enhanced diffusion (spontaneous spectrum discretization) is discussed. © 1997 American Institute of Physics.
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    Radiative and three-body recombination in the Alcator C-Mod divertor (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2555-2566 
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    Source: AIP Digital Archive
    Topics: Physics
    Notes: Significant recombination of the majority ion species has been observed in the divertor region of Alcator C-Mod [I. H. Hutchinson et al., Phys. Plasmas 1, 1511 (1994)] under detached conditions. This determination is made by analysis of the visible spectrum from the divertor, in particular the Balmer series line emission and the observed recombination continuum, including an apparent recombination edge at ∼375 nm. The analysis shows that the electron temperature in the recombining plasma is 0.8–1.5 eV. The measured volume recombination rate is comparable to the rate of ion collection at the divertor plates. The dominant recombination mechanism is three-body recombination into excited states (e+e+D+⇒D0+e), although radiative recombination (e+D+⇒D0+hν) contributes ∼5% to the total rate. Analysis of the Balmer series line intensities (from nupper=3 through 10) shows that the upper levels of these transitions are populated primarily by recombination. Thus the brightnesses of the Balmer series (and Lyman series) are directly related to the recombination rate. © 1997 American Institute of Physics.
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    Comments on "Dispersion relation of a plasma in the periodic magnetic field of a wiggler" [Phys. Plasmas 3, 1773 (1996)] (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2768-2768 
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    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is argued that the equilibrium state of a wiggler background magnetoplasma corresponds to a zero momentum rather than to a plasma acquiring a non-zero velocity. (AIP)
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    Comment on "Dynamic plasma screening effects on semiclassical inelastic electron–ion collisions in dense plasmas" [Phys. Plasmas 4, 21 (1997)] (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2770-2771 
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    Topics: Physics
    Notes: Jung's analysis of dynamics screening appears to be flawed by attempting to patch many-body effects into a single-body theory and a more rigorous foundation is necessary. Jung's result and dynamical screening have been previously analyzed many times.(AIP)
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    Comment on "Explanation for MARFE formation and subsequent evolution into a detached symmetric plasma edge" [Phys. Plasmas 3, 2673 (1996)], "MARFE impurity density limits in tokamaks with poloidal asymmetry and rotation" [Phys. Plasmas 3, 3032 (1996)], and "MARFE suppression by external edge heating" [Phys. Plasmas 4, 134 (1997)] (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2774-2775 
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    Topics: Physics
    Notes: W. M. Stacey presents stability criteria for the thermal instability based on a linear one-dimensional (1D) slab model including the effects of ionization recombination [Phys. Plasmas 3, 2673 (1996)], large radial gradients and rotation [Phys. Plasmas 3, 3032 (1996)] and external edge heating [Phys. Plasmas 4, 134 (1997)]. The second paper is incorrectly presented as a two-dimensional (2D) analysis. The hypothesis for the poloidal asymmetry of the multifaceted asymmetric radiation from the edge (MARFE) is based on a misinterpretation of the linear results and contradicted by our own linear analyses in a 1D cylindrical [Phys. Plasmas 1, 2623 (1994)] and a 2D tokamak model [Plasma Phys. Controlled Fusion 39, 423 (1997)]. The explanation for the evolution into a detached plasma and for MARFE suppression by external edge heating are interesting hypotheses, supported by experimental observations. However, a 1D linear analysis does not offer the basis to support these hypotheses theoretically.© 1997 American Institute of Physics.
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    Enhanced coupling of the fast wave to electrons through mode conversion to the ion hybrid wave (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2031-2043 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An analysis of ion cyclotron resonance heating in a plasma containing two ion species is given. Particular emphasis is placed on the important case of comparable concentrations of the two species. The properties of ion-Bernstein waves in such a plasma are discussed. A summary of the cutoff–resonance (Budden) and cutoff–resonance–cutoff (triplet) configurations is given and an analytic expression obtained for the Budden transmission coefficient (relevant also to the triplet case), which is valid for any concentration ratio of the two-ion species. A formula for the damping coefficient of the ion hybrid wave is obtained and a ray tracing code is used to illustrate the absorption of this mode by electrons close to the two-ion hybrid resonance. The reduced, second-order fast wave equation is solved numerically, illustrating the transition from strong electron heating through mode conversion at the two-ion hybrid resonance to direct electron damping of the fast wave in a high beta plasma.
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    Diamagnetism in a plasma (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2072-2080 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This is an extension of a study of electric currents and force balance orthogonal to a unidirectional magnetic field of induction (B) in a collisionless plasma [K. D. Cole, Phys. Plasmas 3, 2717 (1996)]. All quantities are assumed to vary only in one direction orthogonal to B. Two new concepts are introduced, which are not in conventional plasma physics. First a magnetic polarization effect corresponding to electric polarization is found. This defines a contribution to the magnetic moment per unit volume of −ρmc2E2/B3. Second the conduction current is defined in terms of the curl of the magnetic field intensity H, in accordance with Maxwell. In this scheme, when there is no electric field, (1/4π)(∂H/∂z)B+(∂p⊥/∂z)=0, instead of the conventional equation with B/μ0 in place of H. In both schemes, j×B−(bold del)p⊥=0. Though this makes no difference to the electric current intensity calculated in the two schemes, and no difference to the force balance equation, it makes a significant difference to the relationship between B and p⊥ in many plasma conditions of interest. When the electric field is nonzero, the situation is more complex. It is shown that the new diamagnetism of this paper and the dielectric current of the earlier one are consistent with special relativity. Some applications of the theory are discussed. © 1997 American Institute of Physics.
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    Explosion of soliton in a multicomponent plasma (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2095-2100 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A three-dimensional nonlinear Kadomtsev–Petviashvili (K–P) wave equation is derived to discuss the solitons in multicomponent plasma contaminated with negative ions. A new formalism of the simple wave solution method is developed for finding the soliton behaviors caused by the presence of negative ions in plasmas. It is seen that the nonlinear wave equation leads, in some cases, to an ordinary differential equation and a straight way for solving the soliton propagation in plasmas. The overall observations describe the natures of compressive and rarefactive solitons along with the shock-like wave caused by the interaction of negative ions. Also discussed are the possible controls of the scenarios of soliton behaviors. Moreover it is believed, from present investigations, that the observations of collapses or explosions in solitons could enhance the understanding of the soliton phenomena in laboratory and space plasmas. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872545
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    Statistical theory of resistive drift-wave turbulence and transport (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2116-2133 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Resistive drift-wave turbulence in a slab geometry is studied by statistical closure methods and direct numerical simulations. The two-field Hasegawa–Wakatani (HW) fluid model, which evolves the electrostatic potential and plasma density self-consistently, is a paradigm for understanding the generic nonlinear behavior of multiple-field plasma turbulence. A gyrokinetic derivation of the HW model is sketched. The recently developed Realizable Markovian Closure (RMC) is applied to the HW model; spectral properties, nonlinear energy transfers, and turbulent transport calculations are discussed. The closure results are also compared to direct numerical simulation results; excellent agreement is found. The transport scaling with the adiabaticity parameter, which measures the strength of the parallel electron resistivity, is analytically derived and understood through weak- and strong-turbulence analyses. No evidence is found to support previous suggestions that coherent structures cause a large depression of saturated transport from its quasilinear value in the hydrodynamic regime of the HW model. Instead, the depression of transport is well explained by the spectral balance equation of the (second-order) statistical closure when account is taken of incoherent noise. © 1997 American Institute of Physics.
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    Nonlinear dynamics of a beam-driven magnetic plasma: Streaming or mass motion (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2146-2150 
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    Topics: Physics
    Notes: Explicit results pertaining to nonlinear oscillations in a magnetoactive beam–plasma system that shows transient or streaming phenomena are analytically presented. The nonlinear differential equation is formulated and solved in terms of a modified elliptic integral of motion. The phase-space mappings, and their striking features both in strong streaming and nonstreaming situations, are shown. The new features concerning streaming plasma analysis are illustrated in the form of frequency modulation, especially at the onset of chaos. The diminishing trend of modulated frequency in the strong streaming regions is concluded. The findings may have important implications for magnetospheric and cosmic plasma settings where beam plasma interactions exist. © 1997 American Institute of Physics.
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    The influence of fast ions on the magnetohydrodynamic stability of negative shear profiles (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2181-2187 
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    Topics: Physics
    Notes: The influence of energetic ions on the stability of ideal double kink modes in a tokamak plasma with negative magnetic shear is investigated. It is found that the fast ions play a similar role as for the ordinary m=n=1 internal kink. In particular, phenomena analogous to sawtooth stabilization and fishbone excitation are possible.
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    Frequency dependent effects in helicon plasmas (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2741-2747 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Variations in the plasma parameters of a large volume, helicon source as a function of applied rf power (0–2 kW), driving frequency (8–18 MHz), magnetic field (0–1.4 kG) and fill pressure (2–10 mTorr) have been studied. The transitions between the capacitive, inductive, and resonant helicon mode are consistent with previous experiments. Our data indicate that the transition to the helicon mode occurs at a unique magnetic field, independent of the driving frequency. Based on the helicon wave dispersion relation, from which helicon wavelengths can be calculated, the observed variations in plasma density as a function of driving frequency suggest that the wavelength of the helicon wave is a weak function of driving frequency. Calculation of the electron energies which correspond to the phase velocity of the driving wave (i.e., Landau damping) suggest that either Landau damping cannot be responsible for the efficient ionization of helicon sources, or that the helicon portion of the discharge does not extend over the entire radius of the apparatus. © 1997 American Institute of Physics.
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    Modeling ionization by helicon waves (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2748-2755 
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    Source: AIP Digital Archive
    Topics: Physics
    Notes: The response of the electron distribution function in one dimension to a traveling wave electric field is modeled for parameters relevant to a low-pressure helicon wave plasma source, and the resulting change in the ionization rate calculated. This is done by calculating the trajectories of individual electrons in a given wave field and assuming no collisions to build up the distribution function as the distance from the antenna is increased. The ionization rate is calculated for argon by considering the ionization cross section and electron flux at a specified position and time relative to the left-hand boundary, where the distribution function is assumed to be Maxwellian and the wave travels to the right. The simulation shows pulses in the ionization rate that move away from the antenna at the phase velocity of the wave, demonstrating the effect of resonant electrons trapped in the wave's frame of reference. It is found that the ionization rate is highest when the phase velocity of the wave is between 2 and 3×106 m/s, where the electrons interacting strongly with the wave (i.e., electrons with velocities inside the wave's "trapping width") have initial energies just below the ionization threshold. Results from the model are compared with experimental data and show reasonable qualitative agreement. © 1997 American Institute of Physics.
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    Dynamic plasma screening effects on electron capture process in hydrogenic ion–fully stripped ion collisions in dense plasmas (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2756-2759 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In dense plasmas, dynamic plasma screening effects are investigated on electron capture from hydrogenic ions by past fully stripped ions. The classical Bohr–Lindhard model has been applied to obtain the electron capture probability. The interaction potential in dense plasmas is represented in terms of the longitudinal dielectric function. The classical straight-line trajectory approximation is applied to the motion of the projectile ion in order to visualize the electron capture probability as a function of the impact parameter, projectile energy, and plasma parameters. The electron capture probability including the dynamic plasma screening effect is always greater than that including the static plasma screening effect. When the projectile velocity is smaller than the electron thermal velocity, the dynamic polarization screening effect becomes the static plasma screening effect. When the projectile velocity is greater than the plasma electron thermal velocity, the interaction potential is almost unshielded. The difference between the dynamic and static plasma screening effects is more significant for low energy projectiles. It is found that the static screening formula obtained by the Debye–Hückel model overestimates the plasma screening effects on the electron capture processes in dense plasmas. © 1997 American Institute of Physics.
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    Neoclassical transport in an annular penning trap (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2760-2762 
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    Notes: A modified Penning trap is described with an annular confinement region and a toroidal magnetic field. A non-neutral electron plasma is confined axially by an electrostatic field and, in the radial direction, particles are constrained to lie within a small drift distance of a cylindrical flux surface. Drift orbits of all particles are banana-shaped and collisions cause neoclassical transport. © 1997 American Institute of Physics.
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    Response to "Comments on ‘Dispersion relation of a plasma in the periodic magnetic field of a wiggler' " [Phys. Plasmas 3, 1773 (1996)] (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2769-2769 
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    Topics: Physics
    Notes: It is argued that a wiggler plasma may acquire a non-zero velocity in the equilibrium and that it should be somehow consistent with the conservation of energy. (AIP)
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    Response to "Comment on ‘Dynamic plasma screening effects on semiclassical inelastic electron–ion collisions in dense plasmas' " [Phys. Plasmas 4, 21 (1997)] (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2772-2773 
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    Source: AIP Digital Archive
    Topics: Physics
    Notes: We used a semiclassical technique to calculate the interaction energy between the electron (velocity v) and the target electron by including the dynamic screening effect and effects on atomic transition processes. This differs from previous work. (AIP)
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    Erratum: "Current driven nonlinear Langmuir structures in plasmas" [Phys. Plasmas 4, 230 (1997)] (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2778-2778 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872622
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    Alfvén wave forces, affecting the tokamak edge plasma in the presence of impurities or dust (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3436-3438 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Dust particles appear on the edge of tokamak plasmas as a result of disruptions and plasma interactions with divertor plates, limiters, or blankets, as well as of pellet injections. It is shown that the presence of the dust impurities can lead to an effective decrease of the slow Alfvén wave absorption in the region. These waves are used for heating, current drive, and control of the low-to-high (L–H) confinement transition. Radio-frequency forces can also be strongly changed in the presence of dust particles. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872488
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    Comment on "Two-dimensional solitary kinetic Alfvén waves and dipole vortex structures" [Phys. Plasmas 4, 611 (1997)] (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3445-3446 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872490
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    An electrostatic magnetohydrodynamics theory for resistive-viscous helical instabilities of arc discharges (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2791-2797 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simplified linear analysis for resistive-viscous magnetic helical instabilities of arc discharges in a cylindrical plasma is developed. Based on a set of electrostatic magnetohydrodynamic (MHD) equations, resistive-viscous m=1 modes with an external axial magnetic field are studied. Explicit analytic results are obtained, from which the growth rate and the stability criterion can be shown, and the electrostatic assumption can be justified. In comparison with the previous channel model calculations, this analytic treatment can provide a simplified model for instability estimates, while avoiding artificial assumptions and misorderings in the energy equation. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872411
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    Electric field spikes formed by electron beam–plasma interaction in plasma density gradients (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2805-2812 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the electron beam–plasma interaction at an electric double layer the beam density is much higher than in the classical beam–plasma experiments. The wave propagation takes place along the density gradient that is present at the high potential side of the double layer. Such a case is studied experimentally by injecting the electron beam from a plane cathode, without any grids suppressing the gradient, and by particle simulations. The high frequency field concentrates in a sharp "spike" with a half width of the order of one wavelength. The spike is found to be a standing wave surrounded by regions dominated by propagating waves. It forms at a position where its frequency is close to the local plasma frequency. The spike forms also when the electric field is well below the threshold for modulational instability, and long before a density cavity is formed in the simulations. Particle simulations reveal that, at the spike, there is a backward traveling wave that, when it is strongly damped, accelerates electrons back towards the cathode. In a simulation of a homogeneous plasma without the density gradient no spike is seen, and the wave is purely travelling instead of standing. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872413
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    Frequency dependence of the plasma density for helicon plasmas (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1463-1467 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Variations of plasma density are investigated as a function of frequency of rf power in a helicon plasma source. Abrupt, almost step-like changes in the plasma density are observed during the frequency scans under various conditions of the input rf power, the argon gas pressure, and the magnetic field. It is found that the transition frequencies shift to the lower value region as the input rf power and/or the argon gas pressure is increased, and to the higher value region as the magnetic field is increased. The observed density transitions are compared with semianalytical calculations based on the power balance relation and it has been shown that the results are in good agreement. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872325
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    Dynamics of plasma containing a population of negatively charged heavy vortex elements (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1484-1485 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Due to the presence of a population of heavy, negatively charged vortex elements, plasma becomes birefringent to a low frequency circularly polarized wave of infinitesimally small amplitude. The right circular polarization part remains dispersive whereas the left circular polarization part decays if the rotation associated with the vorticity is anticlockwise as seen by an observer looking antiparallel to the direction of the axis of rotation. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872321
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    Antimatter plasmas and antihydrogen : The 38th annual meeting of the Division of Plasma Physics (DPP) of the American Physical Society (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1528-1543 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recent successes in confining antimatter in the form of positron and antiproton plasmas have created new scientific and technological opportunities. Plasma techniques have been the cornerstone of experimental work in this area, and this is likely to be true for the foreseeable future. Work by a number of groups on trapping antimatter plasmas is summarized, and an overview of the promises and challenges in this field is presented. Topics relating to positron plasmas include the use of positrons to study the unique properties of electron–positron plasmas, the interaction between positrons and ordinary matter, and the laboratory modeling of positron-annihilation processes in interstellar media. The availability of cold, trapped antiprotons and positrons makes possible the production of neutral antimatter in the form of antihydrogen. This is expected to enable precise comparisons of the properties of matter and antimatter, including tests of fundamental symmetries and the measurement of the interaction of antimatter with gravity. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872284
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    Origin of diffusion in Hamiltonian dynamics : The 38th annual meeting of the Division of Plasma Physics (DPP) of the American Physical Society (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1576-1581 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Without invoking any kind of "loss of memory" hypothesis, a diffusion equation is derived for the Hamiltonian dynamics defined by H=p2/2+(K/4π2)∑m=−MM cos(q−mt+cursive-phim), where the cursive-phims are fixed random phases. The key point of the derivation is a property of locality for the waves inducing transport. Using perturbation theory, it is shown that only waves whose phase velocities satisfy |m−p(t)|≤α(K/4π2)2/3, where α is a constant, approximately 5, play a relevant role for the statistical properties of the dynamics. This implies scaling properties for the dynamics, and leads to the understanding of the origin of force decorrelation and of diffusion, and to the prediction of their occurrence in time. Moreover, the convergence of the diffusion coefficient to its quasilinear value when K→∞ is shown, and is interpreted as the consequence of the crossover between two regimes of decorrelation that are of different natures. © 1997 American Institute of Physics.
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    Test particle transport from long-range collisions : The 38th annual meeting of the Division of Plasma Physics (DPP) of the American Physical Society (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1552-1558 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Enhanced cross-magnetic-field diffusion of test particles in pure ion plasmas has been measured. The ion plasma is contained in a Penning-Malmberg trap for weeks near thermodynamic equilibrium, characterized by rigid rotation and uniform density and temperature. Plasma expansion and loss is suppressed by a "rotating wall" technique, i.e., a weak electrostatic potential rotating faster than the plasma. Test particle transport is then measured even though there is zero net transport, in a regime where neutral collisions are negligible. The observed test particle transport is diffusive, i.e., proportional to the gradient of the test particle concentration. The measured diffusion coefficients scale as nT−1/2B−2 over a range of 40 in density, 50 in temperature, and 5 in magnetic field. This diffusion is about ten times greater than predicted by classical collisional theory, which describes velocity-scattering collisions with impact parameters ρ(approximately-less-than)rc. The enhanced transport is thought to be due to non-velocity-scattering "E×B drift" collisions with rc〈ρ(approximately-less-than)λD. Initial estimates of diffusion due to these long-range collisions are three times less than the measurements, and substantial theory questions remain. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872359
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    The stability of advanced operational regimes on the Tokamak Fusion Test Reactor : The 38th annual meeting of the Division of Plasma Physics (DPP) of the American Physical Society (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1589-1595 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The performance of the Tokamak Fusion Test Reactor [D. Meade and the TFTR Group, in Plasma Physics and Controlled Nuclear Fusion Research, Washington, D.C., 1990 (International Atomic Energy Agency, Vienna, 1991), Vol. I, pp. 9–24], as defined by the maximum fusion power production, has been limited, not by confinement, but by stability to pressure-driven modes. Two classes of current profile modification have been investigated to overcome this limit. A new technique has been developed to increase the internal inductance of low-q (q(approximate)4), high-current (Ip〉2MA) plasmas. As was the case at higher edge q, the disruptive β limit has been found to increase roughly linearly with the internal inductance, li. Plasmas with hollow current profiles, i.e., reversed shear, are also predicted and experimentally observed to have increased stability in the negative shear region to ballooning and kink modes. However, performance of these plasmas is still limited by pressure-driven modes in the normal shear region. © 1997 American Institute of Physics.
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    Recent progress in the design of stellarator experiments : The 38th annual meeting of the Division of Plasma Physics (DPP) of the American Physical Society (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1617-1622 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To evaluate stellarators as power plants, a helias configuration was developed by running high performance computer codes written at New York University. A modular coil set was found that had ample spacing for a reactor and took advantage of the concept of quasihelical symmetry. Since that time, the design has been further optimized and a similar stellarator has been discovered that has just two field periods and a plasma with the low aspect ratio 3.5. Its principal advantage is that in a flux coordinate system its magnetic-field structure comes close to having axial symmetry, so transport is predicted to be almost as good as that in a tokamak at high temperatures. Only 16 moderately twisted coils are required to produce the external magnetic field, and the configuration might well be viewed as a steady-state tokamak rather than an alternate concept. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872292
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    Fivefold confinement time increase in the Madison Symmetric Torus using inductive poloidal current drive : The 38th annual meeting of the Division of Plasma Physics (DPP) of the American Physical Society (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1632-1637 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Current profile control is employed in the Madison Symmetric Torus [R. N. Dexter et al., Fusion Technol. 19, 131 (1991)] reversed field pinch to reduce the magnetic fluctuations responsible for anomalous transport. An inductive poloidal electric-field pulse is applied in the sense to flatten the parallel current profile, reducing the dynamo fluctuation amplitude required to sustain the equilibrium. This technique demonstrates a substantial reduction in fluctuation amplitude (as much as 50%), and improvement in energy confinement (from 1 to 5 ms); a record low fluctuation (0.8%) and record high temperature (615 eV) for this device were observed simultaneously during current drive experiments. Plasma beta increases by 50% and the Ohmic input power is three times lower. Particle confinement improves and plasma impurity contamination is reduced. The results of the transient current drive experiments provide motivation for continuing development of steady-state current profile control strategies for the reversed field pinch. © 1997 American Institute of Physics.
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    High β produced by neutral beam injection in the START (Small Tight Aspect Ratio Tokamak) spherical tokamak : The 38th annual meeting of the Division of Plasma Physics (DPP) of the American Physical Society (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1665-1671 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The world's first high-power auxiliary heating experiments in a tight aspect ratio (or spherical) tokamak have been performed on the Small Tight Aspect Ratio Tokomak (START) device [Sykes et al., Nucl. Fusion 32, 694 (1992)] at Culham Laboratory, using the 40 keV, 0.5 MW Neutral Beam Injector loaned by the Oak Ridge National Laboratory. Injection has been mainly of hydrogen into hydrogen or deuterium target plasmas, with a one-day campaign to explore D→D operation. In each case injection provides a combination of higher density operation and effective heating of both ions and electrons. The highest β values achieved to date in START are volume average βT∼11.5% and central beta βO∼50%. Already high, these values are expected to increase further with the use of higher beam power. © 1997 American Institute of Physics.
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    Impurity screening in Ohmic and high confinement (H-mode) plasmas in the Alcator C-Mod tokamak : The 38th annual meeting of the Division of Plasma Physics (DPP) of the American Physical Society (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1681-1689 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of experiments has been carried out to determine the relative screening of the low recycling gaseous impurities, nitrogen and methane, in Alcator C-Mod tokamak [Phys. Plasmas 1, 1511 (1994)] discharges. The impurity density in the core plasma is directly proportional to the rate of impurity injection. Screening was found to vary weakly with plasma density but to be markedly dependent on the poloidal position of injection. Detachment of the plasma results in significantly less screening both in Ohmic and in high confinement (H-mode) discharges, particularly when the gas is injected into the divertor or at the inner vessel wall. Evidence of impurity transport from the scrape-off layer into the divertor using bolometry and visible spectroscopy is presented and modeling of the transport using a two-dimensional Monte Carlo code is described. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872365
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    High performance Joint European Torus (JET) plasmas for deuterium–tritium operation with the MkII divertor : The 38th annual meeting of the Division of Plasma Physics (DPP) of the American Physical Society (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1725-1735 
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    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Planned experiments in the Joint European Torus [Plasma Physics and Controlled Fusion Research, Proceedings, 13th International Conference, Washington, D.C., 1990 (International Atomic Energy Agency, Vienna, 1991), Vol. 1, p. 27] (JET) with deuterium–tritium (D–T) plasmas require high fusion performance for α-particle heating studies and for investigation of isotope dependence in conditions relevant to the International Thermonuclear Experimental Reactor [Plasma Phys. Controlled Fusion 37, A19 (1995)]. In deuterium plasmas, the highest neutron rates have been obtained in the hot-ion high-confinement mode (H mode) which is ultimately limited by magnetohydrodynamic (MHD) phenomena when the pressure gradient approaches ideal ballooning and kink stability limits in the vicinity of the edge transport barrier. Results are reported confirming the MkII divertor's increased closure and pumping in this regime, progress in understanding the MHD-related termination is discussed, and the use of ion cyclotron resonance heating (ICRH) in combination with high-power neutral beams to increase the neutron yield is described. In separate experiments internal transport barriers have been established through careful programming of the current ramp and heating waveforms, and neutron emission comparable with the best hot-ion H-modes achieved. Steady-state H-mode discharges exhibiting edge localized modes (ELMs) in reactor-like configurations and conditions have been demonstrated, including cases in which relevant dimensionless parameter values are preserved, ready also for testing in D–T. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872361
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    Investigation of physical processes limiting plasma density in high confinement mode discharges on DIII-D : The 38th annual meeting of the Division of Plasma Physics (DPP) of the American Physical Society (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1752-1760 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of experiments was conducted on the DIII-D tokamak [J. L. Luxon and L. G. Davis, Fusion Technol. 8, 441 (1985)] to investigate the physical processes which limit density in high confinement mode (H-mode) discharges. The typical H-mode to low confinement mode (L-mode) transition limit at high density near the empirical Greenwald density limit [M. Greenwald et al., Nucl. Fusion 28, 2199 (1988)] was avoided by divertor pumping, which reduced divertor neutral pressure and prevented formation of a high density, intense radiation zone (MARFE) near the X-point. It was determined that the density decay time after pellet injection was independent of density relative to the Greenwald limit and increased nonlinearly with the plasma current. Magnetohydrodynamic (MHD) activity in pellet-fueled plasmas was observed at all power levels, and often caused unacceptable confinement degradation, except when the neutral beam injected (NBI) power was ≤3 MW. Formation of MARFEs on closed field lines was avoided with low safety factor (q) operation but was observed at high q, qualitatively consistent with theory. By using pellet fueling and optimizing discharge parameters to avoid each of these limits, an operational space was accessed in which density ∼1.5×Greenwald limit was achieved for 600 ms, and good H-mode confinement was maintained for 300 ms of the density flat-top. More significantly, the density was successfully increased to the limit where a central radiative collapse was observed, the most fundamental density limit in tokamaks. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872277
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    Spatio-temporal dynamics of the resonantly excited relativistic plasma wave driven by a CO2 laser (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1434-1447 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dynamics of a relativistic plasma wave (RPW) resonantly excited by a two frequency CO2 laser pulse and the effects of this wave on a co-propagating relativistic electron beam were studied through experiments and supporting simulations. The amplitude of the RPW and its harmonics were resolved in time and space with a Thomson scattering diagnostic. In addition, the plasma wave amplitude-length product and temporal duration were independently measured through time and frequency resolved forward scattering. The transverse electric and magnetic fields associated with the RPW were studied by the scattering of a 2 MeV electron beam, and the eventual heating of the plasma after the breakup of the RPW was measured from the x-ray radiation spectrum. The experiments and simulations show that the RPW reaches a peak amplitude of approximately 30%, with the amplitude limited by plasma blowout driven by the radial ponderomotive forces of the plasma wave. © 1997 American Institute of Physics.
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    URL: http://dx.doi.org/10.1063/1.872318
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