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  • 1985-1989  (32)
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  • 1
    Electronic Resource
    Electronic Resource
    Dynamics and spectroscopic manifestations of two-photon bound–bound absorption through a repulsive intermediate state (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 6767-6769 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453416
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Parametric study of electron density profile evolution following injection in TFTR (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1999-1999 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Recent results from tokamak fusion test reactor (TFTR)1 pellet experiments have extended previous results to a larger volume and longer time scales. In this paper, the detailed study of electron density profile response following pellet injection is discussed. In particular, hollow density profiles with relatively long relaxation times (10–100 ms) from inverted gradients are obtained by injection of 2.67-mm-diam pellets, which penetrate to r(approximately-equal-to)a/2. Strongly peaked profiles [ne(0)/n¯e∼3] and central electron density ∼3.9×1020 m−3 are obtained by injection of three pellets, which penetrate to or beyond the magnetic axis. In both cases, the pellet mass is well accounted for by the measured density perturbation. This work was supported by U.S. DOE Contract No. DE-AC02-CHO-3073.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138769
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Study of the detached plasma regime in TFTR using the MIRI far-infrared interferometer (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1999-1999 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Plasmas have been formed in the tokamak fusion test reactor (TFTR) which separate completely from the limiter and are called detached plasmas. The physical evidence for the separation from the limiter is that all the ohmic input power is radiated away at the plasma boundary which can be 10→30 cm inside the limiter. The 10-chord multichannel MIRI interferometer system has been used to diagnose this region and follows the formation of the detached state through a MARFE. MIRI indicates that a plasma ∼0.5→1×1013 cm−3 occurs in the region between the luminous boundary and the limiter. This work was supported by U.S. DOE Contract No. DE-AC02-76-CHO-3073.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138770
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Measurements of Faraday rotation in TFTR plasmas (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1994-1996 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Recent results of simultaneous measurements of line electron density and poloidal field-induced Faraday rotation on the multichannel far infrared (FIR) interferometer/polarimeter on tokamak fusion test reactor (TFTR) are presented. The procedures and results of the calibration are described in detail. The effects of various errors in the measurement, as well as the problem of cross-coupling laser beams, are studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138764
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Tokamak ion temperature determination via cw far-infrared laser scattering (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 922-924 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A successful proof-of-principle experimental determination of ion temperature in a tokamak plasma via cw far-infrared (FIR) collective laser scattering from ion Bernstein waves is reported. The Bernstein waves are excited via mode conversion of an externally launched fast Alfven wave at the second-harmonic cyclotron layer. A fit of the experimentally determined ion Bernstein wave dispersion to the temperature-dependent theoretical dispersion yields the local ion temperature. Partial ion temperature profiles (chord averaged) have been obtained with temperature values consistent with charge exchange measurements. Single-shot measurements should be available in the near future with the use of the multichannel scattering systems and high-power laser sources developed at UCLA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138043
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Development and application of multichannel collective scattering systems (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1055-1056 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The numerous applications of cw collective Thomson scattering in fusion plasmas are greatly enhanced by the addition of a multichannel capability. This permits the determination of the dispersive properties (ω vs k) of waves on a single tokamak discharge. This paper describes the development, calibration, and application of such systems in the far-infrared spectral region. The measurement of the wave dispersion of externally excited ion Bernstein waves leads to the determination of ion temperature in a tokamak plasma. In addition, the study of naturally occurring microturbulence has produced a series of unique observations which has both motivated theoretical effort and clarified the role of density fluctuations in anomalous transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138267
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Zn diffusion enhancement of interdiffusion in a GaInAsP-InP heterostructure (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1768-1770 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of concurrent Zn diffusion on the interdiffusion in a Gax In1−x Asy P1−y -InP heterostructure (x=0.28, y=0.61) was investigated using Auger electron spectroscopy and secondary-ion mass spectrometry. The measured profiles showed that the Zn diffusion (600 °C, 1–4 h) predominantly enhanced the cation (In-Ga) interdiffusion. The result could not be interpreted by the Zn-vacancy complex model. Under conditions of a group V overpressure, our results suggest that cation interstitials may control both the rate of Zn diffusion and the mixing of the group III sublattices in the InP-based alloy system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102213
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Saturation of the light-induced defect density in hydrogenated amorphous silicon (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 2658-2660 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report new experimental results on the saturation of the light-induced defect density in hydrogenated (and fluorinated) amorphous silicon. The films were illuminated near room temperature up to 5000 h with bandpass filtered red light at a carrier generation rate G of 5×1020 cm−3 s−1, or up to 20 h with Kr+ laser light (λ=647.1 nm) at G=3×1022 cm−3 s−1. The bulk defect densities Ns saturate in both cases in the vicinity of 1017 cm−3. The saturation values are almost independent either of G or of temperature in the range from room temperature to about 70 °C. The illumination time to reach saturation is approximately proportional to 1/G2. These results are discussed within the framework of existing models for the light-induced defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101965
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Impurity diffusion enhancement of interdiffusion in an InGaPAs-GaAs heterostructure (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 1048-1052 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of concurrent diffusion of Zn and Si on the interdiffusion on the cation and anion sublattices was studied in InxGa1−xPyAs1−y-GaAs heterostructures (with x and y≈0.05). The heterostructures are grown by liquid phase epitaxy and the diffusion sources are equilibrium ternary tie triangle sources. The extent of interdiffusion on both group III and V atoms is observed by depth profiling In and P, respectively, with secondary ion-mass spectrometry. The Zn diffusion selectively enhances the cation (In-Ga) interdiffusion, whereas Si diffusion enhances both cation and anion interdiffusion to the same extent. A kick-out mechanism is proposed to explain the selective enhancement of the cation interdiffusion induced by Zn, and a single vacancy mechanism is proposed for the interdiffusion due to Si. Based on those observations, we propose that the impurity diffusion mechanism is a major factor in determining the degree of enhancement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343039
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    MIRI: A multichannel far-infrared interferometer/polarimeter for TFTR (abstract) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 938-938 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A double path multichannel far-infrared interferometer/ polarimeter employing retroreflectors for density and current profile determination has been developed for TFTR. The system containing about 400 optical components is mounted on a 70 000-lb. vibration-free stand which encircles TFTR. Optically pumped cw CH3OH (λ=110 μm, p(approximately-equal-to)100 mW) twin lasers with a frequency separation of l MHz are employed as a source. Quasioptical Schottky diodes (NEP(approximately-equal-to)l0−9 W(Hz)1/2) are used as detectors. Considerable efforts are devoted to have remote control capabilities for future D–T operation. The detailed design characteristics of this system together with preliminary results of chord averaged density information will be presented. Also the theoretical aspects of Faraday rotation for TFTR plasma will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138051
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    Paper (German National Licenses)
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