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  • 1
    Electronic Resource
    Electronic Resource
    Temperature measurements of a neon Z-pinch plasma (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 2260-2267 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A neon Z-pinch plasma, appropriate for sodium/neon photopumping experiments, is studied in detail using temporally, spatially, and spectrally resolved measurements of Ne VII, Ne VIII, and Ne IX emissions. The neon is imploded with a 1 μs rise time, 150–180 kA peak current pulse. Two successive implosions are identified. The first implosion produces a 1-mm-diam plasma with an electron density of 9×1019 cm−3 and a temperature of 200 eV. The second implosion produces a larger diameter (3.5 mm), less dense (7×1018 cm−3) plasma with a temperature of 100 eV. A 70% Ne IX ground-state population at the second implosion is deduced from the measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354709
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  • 2
    Electronic Resource
    Electronic Resource
    Density measurements of a neon Z-pinch plasma (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 3163-3168 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The absolute intensity of near-ultraviolet emission from a neon Z-pinch plasma is measured with a time-gated, two-dimensional optical multichannel analyzer (OMA). The OMA provides spatial and spectral resolution with a 100 ns gate duration. Spatially resolved continuum emission, Ne viii line emission, and Ne viii line-profile measurements are used to determine the pinch diameter, the density of the neon plasma, and the Ne viii 3p level population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352986
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  • 3
    Electronic Resource
    Electronic Resource
    Neutral atom temperature and flow measurements in the edge region of the Alcator C-mod tokamak (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 1253-1262 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spectral line shifts have been observed in the Dα transition of neutral deuterium in the Alcator C-mod [I. H. Hutchinson, Proceedings of the IEEE 13th Symposium on Fusion Engineering (IEEE, Piscataway, 1990), Vol. 1, p. 13] tokamak and interpreted as Doppler shifts due to a neutral flow of approximately 5×103 m/s. The emission originates from plasma at the inner wall, as indicated by the Zeeman patterns of the transition. The direction of the flow changes when the plasma transitions from a limited to a diverted configuration. In all cases, the flows are directed toward the point of contact with the wall or divertor plate. Narrow spectral profiles have been observed for the Dα transition near the midplane and within the divertor. Temperatures not higher than 0.86 eV are indicated for the divertor measurements. A difference in plasma conditions for separate locations along a single line of sight has been observed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1355025
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  • 4
    Electronic Resource
    Electronic Resource
    Density measurements in the edge, divertor and X-point regions of Alcator C-Mod from Balmer series emission (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 4246-4251 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electron density in the edge, divertor and X-point regions of Alcator C-Mod [Proceedings of the IEEE 13th Symposium on Fusion Engineering (Institute of Electrical and Electronic Engineers, New York, 1990), Vol. 1, p. 13] has been measured using the Stark broadening of high-n (n=8 through 11) transitions of the Balmer series of deuterium. These measurements have been made during typical single null, diverted operation and during gas-puffing through capillaries located within the first wall and divertor. Electron densities up to 1.6×1021 m−3 have been measured in the X-point region and slightly lower densities (5−7×1020 m−3) have been measured in the divertor and edge regions. These results are factors of 2 to 5 larger than the density measurements from the CO2 laser interferometer system in the main chamber (3×1020 m−3) and comparable with probe measurements in the divertor. The ratios of the widths of adjacent lines within the Balmer series have been compared with ratios calculated for the Stark broadening of these lines. These transitions can be used to measure electron densities from 3×1019 to 2×1021 m−3 with a modest resolution spectrograph [(Δλinst=1 A(ring) full width at half maximum)]. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871049
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  • 5
    Electronic Resource
    Electronic Resource
    Extending x-ray streak camera operation to vacuum ultraviolet wavelengths : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 713-715 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A major limitation in the use of x-ray streak cameras at longer wavelengths in the vacuum ultraviolet spectral region is the strong absorption of the radiation in the conductive thin films that are used for transmission photocathode substrates. Reflection photocathodes require off-axis illumination and hence do not couple easily to instruments such as flat-field spectrographs. We are investigating the use and optimization of an open-geometry photocathode structure consisting of a fine-mesh wire screen coated with the photoemissive material. Photons impinge directly onto this coated screen. Photoelectrons emitted from the side surfaces of the wires are accelerated into the streak tube by the applied field penetrating into the plane of the wire screen. Coatings of CsI and CuI are under study. Laser-produced plasmas, as well as discharge sources, are being used for the testing and optimization. A flat-field grazing-incidence spectrograph and a 1 m, normal-incidence spectrograph are used to cover the spectral region from 3 to 200 nm. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146267
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  • 6
    Electronic Resource
    Electronic Resource
    Localization of emission through interpretation of observed Zeeman pattern (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 1664-1670 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Observations of spectral line profiles commonly represent the integration of emission along the line of sight. Depending on the number of views and the symmetries involved, one can use techniques ranging from simple Abel inversion to complex tomographic reconstruction to find the spatial distribution emitters. In tokamak experiments, the spatial dependence of the magnetic field is typically available and can be used to gain important insights into the absence of other spatial information. The Zeeman patterns of spectral lines from neutral atoms and low-Z ions in tokamak plasmas can contain enough information to restrict the location of emission to well defined positions along a given line of sight. Simple modeling of observations with high spectral resolution from Alcator C-Mod plasmas demonstrates the application of this technique to the interpretation of experimental data. This localization of emission is not only of interest to spectroscopists and modelers of tokamak edge and divertor regions, it could be used to aid the operation of other visible-light diagnostics that seek spatial resolution. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150516
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  • 7
    Electronic Resource
    Electronic Resource
    Sodium-fluoride discharge for fast Z-pinch experiments (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 2664-2672 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A capillary-discharge plasma source has been developed to produce a sodium-bearing plasma for fast Z-pinch implosion experiments. Peak currents of 40–50 kA from a 0.5-kJ capacitor bank were driven through a 0.5-mm-diam, few cm long capillary drilled in packed sodium-fluoride powder to form the source. A nozzle was used to collimate plasma ejected from one end of the capillary to produce a 1–2-cm-diam, several cm long cylindrical plasma. Ions with velocities of 2.2–3.4 cm/μs and densities of up to 5×1015 cm−3 were measured with biased charge collectors located at least 5 cm from the nozzle. Measurements of visible light from neutrals near the nozzle exit gave velocities of 1.5–1.7 cm/μs. Indications of axial and radial nonuniformities of the plasma were observed in framing photographs of visible-light emission and in spatially resolved spectral measurements. Neutral-sodium and neutral-fluorine lines were identified in the spectral range from 2300 to 6700 A(ring). Also, impurity lines of carbon, copper, and hydrogen were identified and used to characterize the plasma. Stark broadening of the Balmer alpha line of hydrogen was used to deduce a peak electron density of 8×1016 cm−3 at the exit of a 2-cm-diam nozzle. Electron temperatures of 1.4–1.6 eV at the nozzle exit were inferred from relative intensities of the C i and C ii lines. At this density and temperature, Saha-equilibrium-model calculations indicate that the plasma consists primarily of singly ionized sodium and neutral fluorine. A total mass per unit length (sodium and fluorine) of at least 15 μg/cm is deduced from this analysis of the plasma constituents. This capillary discharge has been used to produce 50–100 GW of sodium K-shell x rays in fast Z-pinch experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342749
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of d-amphetamine upon open field behaviour in two inbred strains of mice (1973)
    Springer
    Cellular and molecular life sciences 29 (1973), S. 625-626 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Chez des souris C57BL/10J, on constate une augmentation de l'activité locomotrice durant tous les 7 jours qui suivent leur injection avec la d-amphétamine. Chez des souris BALB/cJ, cette augmentation n'apparaît pas, sauf légèrement après le quatrième jour. Des facteurs génétiques jouent un rôle important dans la détermination de la réponse comportementale à la d-amphétamine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01926708
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  • 9
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    Implosion of sodium‐bearing capillary‐discharge plasmas for x‐ray laser experiments (1987)
    American Institute of Physics
    Details
    Publication Date: 1987-04-20
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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  • 10
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    Neutral atom temperature and flow measurements in the edge region of the Alcator C-mod tokamak (2001)
    American Institute of Physics
    Details
    Publication Date: 2001-01-01
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics
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