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Abstracts of papers Minneapolis Fall Meeting (1963)

Litchfield, C. C. ; Rakoff, Henry ; Maire, Renȳ ; [weitere]

Wiley

In: Journal of the American Oil Chemists' Society. 1963; 40(9): 9-45. Published 1963 Sep 01. doi: 10.1007/bf02632851.

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Publikationsdatum: 1963-09-01

Print ISSN: 0003-021X

Digitale ISSN: 1558-9331

Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Publiziert von Wiley

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A new macromolecular crystallography Station (9.5) on the SRS wiggler beam line for very rapid Laue and rapidly tunable monochromatic measurements: Commissioning and first results : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)

Thompson, A. W. ; Habash, J. ; Harrop, S. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 63 (1992), S. 1062-1064

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: A new instrument (Station 9.5) has been established on the wiggler line at the Daresbury Synchrotron Radiation Source (SRS). It extends the experimental capability at Daresbury for macromolecular crystallography beyond what is provided for with Stations 7.2 (Ref. 1), 9.6 (Ref. 2), and 9.7 by providing a point focused white beam (from a Pt-coated toroid mirror) and/or a rapidly tunable monochromatic beam (using a water-cooled double-crystal monochromator (Ref. 3). The design principles of the new Station 9.5 have been published (Ref. 4). A CCD detector for the station is being developed (preliminary work is described in Ref. 5, or see the additional poster at this meeting) to allow time slices of part of a diffraction pattern to be measured. Laue patterns are currently recorded on film, but access to an image plate detector will shortly become available. Shutter speeds down to 50 μs are routinely available using a rotating disk shutter (Ref. 6). Fluorescence detectors are available for optimized anomalous dispersion data collection. The experimental bench is long enough to accommodate a camera system, and downstream from it an "on-line'' image plate scanner. Data collected on the instrument in various modes of operation will be described for a variety of macro and small molecule crystal systems.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1143199

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Gyrotron collective Thomson scattering from plasma fluctuations in a Tara axicell (1988)

Machuzak, J. S. ; Woskov, P. P. ; Myer, R. C. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 59 (1988), S. 1562-1564

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: Collective Thomson scattering in the Tara Tandem Mirror axicell at MIT was accomplished with a 137-GHz, ∼0.4-kW, 75-ms pulsed gyrotron. Ion cyclotron waves, ion Bernstein wave harmonics, and other plasma fluctuations possibly due to microinstabilities and magnetohydrodynamic (MHD) activity have been observed during ion cyclotron resonance frequency (ICRF) heating. The observation of ion Bernstein waves may be due to an enhanced ion thermal fluctuation spectrum in an ICRF heated plasma.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1140197

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Vertical high-resolution Bragg x-ray spectrometer for the tokamak fusion test reactor (1986)

Bitter, M. ; Hill, K. W. ; Cohen, S. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 57 (1986), S. 2145-2147

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: A Bragg x-ray spectrometer of high spectral resolution (λ/Δλ=10 000–20 000) which accommodates three crystals and position-sensitive detectors in the Johann configuration has been installed in the diagnostic basement of the tokamak fusion test reactor (TFTR) for the measurement of radial ion temperature profiles. The ion temperature is derived from the Doppler broadening of Kα-resonance lines of metal impurity ions, e.g., Ti, Cr, Fe, and Ni, in the helium-like and hydrogen-like charge states. The x-ray diffraction plane is almost perpendicular to the magnetic axis, but slightly tilted by an angle of 3.8°, which makes it possible to measure poloidal and toroidal plasma rotation velocities of vaitch-theta〉5×103 m/s and vΦ〉1×105 m/s, from the Doppler shift of spectral lines. Results obtained from the observation of TiXXl Kα-line spectra with a 220-silicon crystal of a 2d spacing of 3.8400 A(ring) and a curvature radius of 11.05 m are reported.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1138711

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Analysis of polarizabilities, potentials, and geometries of alkali–halide dimers (1991)

Chauhan, R. S. ; Sharma, S. C. ; Sharma, S. B. ; [weitere]

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 95 (1991), S. 4397-4406

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ISSN: 1089-7690

Quelle: AIP Digital Archive

Thema: Physik , Chemie und Pharmazie

Notizen: An analysis of electronic polarizabilities, interionic potentials, and equilibrium geometries for 20 alkali–halide dimers such as Na2Cl2 is presented. The electronic polarizabilities of ions in dimers have been calculated by taking account of the electrostatic potential due to neighboring ions within the Seitz–Ruffa energy level analysis. The polarizabilities thus obtained for dimers are then used to evaluate the magnitudes of polarization energies and van der Waals dipole–dipole energies. For describing the overlap repulsive potential we have adopted two forms: (i) the revised version of the Born–Mayer potential and (ii) the Harrison form for the overlap repulsive energy. These potentials have been used to obtain the binding energies of monomers as well as dimers, spectroscopic constants of monomers, equilibrium geometries of dimers, and dimerization energies. The results have been discussed and compared with available experimental data.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.461763

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Alpha particle diagnostics using impurity pellet injection (invited) : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)

Fisher, R. K. ; McChesney, J. M. ; Howald, A. W. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 63 (1992), S. 4499-4504

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: We have proposed using impurity pellet injection to measure the energy distribution of the fast confined alpha particles in a reacting plasma [R. K. Fisher et al., Fusion Technol. 13, 536 (1988)]. The ablation cloud surrounding the injected pellet is thick enough that an equilibrium fraction F∞0(E) of the incident alphas should be neutralized as they pass through the cloud. By observing neutrals created in the large spatial region of the cloud which is expected to be dominated by the heliumlike ionization state, e.g., Li+ ions, we can determine the incident alpha distribution dnHe2+/dE from the measured energy distribution of neutral helium atoms dnHe0/dE using dnHe0/dE = dnHe2+/dE⋅F∞0 (E,Li+). Initial experiments were performed on the Texas Experimental Tokamak (TEXT) in which we compared pellet penetration with our impurity pellet ablation model [P. B. Parks et al., Nucl. Fusion 28, 477 (1988)], and measured the spatial distribution of various ionization states in carbon pellet clouds [R. K. Fisher et al., Rev. Sci. Instrum. 61, 3196 (1990)]. Experiments have recently begun on the Tokamak Fusion Test Reactor (TFTR) with the goal of measuring the alpha particle energy distribution during D–T operation in 1993–94. A series of preliminary experiments are planned to test the diagnostic concept. The first experiments will observe neutrals from beam-injected deuterium ions and the high energy 3He tail produced during ion cyclotron (ICH) minority heating on TFTR interacting with the cloud. We will also monitor by line radiation the charge state distributions in lithium, boron, and carbon clouds. Later experiments are planned to measure the energy distribution of the 3.7 MeV alphas created by 3He–D reactions during ICH minority heating. Observations of 3.7 MeV alphas should allow single-particle alpha physics to be studied now and result in a fully tested diagnostic prior to D–T operation of TFTR.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1143705

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Neutron calibration techniques for comparison of tokamak results (1990)

Strachan, J. D. ; Adams, J. M. ; Barnes, Cris W. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 61 (1990), S. 3501-3504

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: A workshop on 1–3 August 1989 reviewed the techniques, uncertainties, and experiences of neutron calibration on PLT, TFTR, JET, Tore Supra, JT-60, JIPPT-IIU, Alcator C-Mod, ATF, FT, ASDEX, Textor, and DIII-D. In the summary session, the workshop participants discussed possible consensus neutron calibration techniques appropriate to D-D plasmas in tokamaks. The application of such techniques would facilitate a more accurate comparison of neutron yields from different devices, and also allow new calibration techniques to relate their precision to a reference value. General agreement was reached on the suitability of two techniques: (1) a 252Cf source calibration of epithermal neutron detectors, and (2) threshold neutron activation of Ni foils placed vertically above or below the plasma. This paper will present details on detector positioning, neutron transport calculations, and interlab normalization needed to accomplish the standardized calibration using a Cf neutron source.

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URL: http://dx.doi.org/10.1063/1.1141558

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Audio-frequency discharge cleaning system for the SINP tokamak using single turn primary (1994)

Ranjan, P. ; Hui, A. K. ; Chowdhury, S. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 65 (1994), S. 135-139

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: Taking advantage of the iron core of the Saha Institute of Nuclear Physics (SINP) tokamak, a single turn primary coil was used to generate low power ohmically excited audio-frequency hydrogen plasma to clean the SINP tokamak vacuum vessel of adsorbed gases. This scheme allowed us to easily use available low voltage power transistors and other existing power supply components to generate audio-frequency voltage. Using this scheme the discharge cleaning system was tested successfully in a short period of 2–3 months. The system has been utilized to carry out initial discharge cleaning of the vessel as well as daily cleaning to achieve full designed parameters of our tokamak.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1144785

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A wavemeter for measuring changes in wavelength of pulsed dye lasers (1994)

Thattey, S. S. ; Dongare, A. S. ; Dasgupta, K. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 65 (1994), S. 2470-2474

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: The performance of a simple wavemeter for measuring changes in wavelength of a pulsed dye laser is described. Details of optics and electronic circuitary used, along with the algorithm for wavelength measurement, are given. Using this instrument wavelength changes of a dye laser could be measured, as well as introduced through a user interface, with an accuracy of 1 ppm.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1144704

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Design of a compact storage ring for industrial research : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)

Nakanishi, T. ; Okuda, S. ; Ikegami, K. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 63 (1992), S. 770-773

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: An 800-MeV compact storage ring is under construction for development of the technology of a compact ring and for research of x-ray lithography and material analysis. Synchrotron radiation with a critical wavelength of 0.65 nm is emitted from a pair of superconducting bending magnets. A straight section of the ring has only one quadrupole magnet to make the smaller ring. An injection efficiency with a single kicker magnet is optimized by computer simulation. The kicker field strength and an injection angle are determined. A beam tracking with a numerical integration method shows this ring has a sufficiently wide dynamic aperture of ||x||(approximately-equal-to)30 mm and ||y||(approximately-equal-to)50 mm at the center of the bending magnet, which has βxmin and βymax. A 1-GeV synchrotron is used as an injector, which has accelerated a beam up to 1 GeV.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1142658

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