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  • Artikel: DFG Deutsche Nationallizenzen  (35)
  • 1985-1989  (32)
  • 1975-1979  (3)
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  • Artikel: DFG Deutsche Nationallizenzen  (35)
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  • 1
    Digitale Medien
    Digitale Medien
    Experimental study of nonlinear current-voltage behavior in undoped polycrystalline silicon (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 2419-2421 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Electrical conduction data from undoped low-pressure chemically vapor deposited polycrystalline silicon thin films at room temperature and above are presented. The physical mechanisms pertinent to general current-voltage characteristics are experimentally interrogated from three different viewpoints. In the nonlinear current-voltage region, the sheet resistance Rs is shown to vary drastically depending on the device aspect ratio for given applied electrical field E¯. The nonscalability of Rs with respect to E¯, the temperature behavior of Rs, and the photoconductivity data indicate that the nonlinear current-voltage behavior cannot be attributed to field-enhanced conductivity. Other possible mechanisms responsible for observed nonlinearity are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.337154
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  • 2
    Digitale Medien
    Digitale Medien
    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
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.343039
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.453416
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  • 4
    Digitale Medien
    Digitale Medien
    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
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1138770
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  • 5
    Digitale Medien
    Digitale Medien
    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
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1138051
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  • 6
    Digitale Medien
    Digitale Medien
    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
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1138769
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  • 7
    Digitale Medien
    Digitale Medien
    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
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1138764
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  • 8
    Digitale Medien
    Digitale Medien
    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
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1138043
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  • 9
    Digitale Medien
    Digitale Medien
    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
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1138267
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  • 10
    Digitale Medien
    Digitale Medien
    Electron channeling radiation from diamonds with and without platelets (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 1661-1664 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Channeling-radiation spectra produced by planar-channeled, 30.5-MeV electrons in Type-Ia and Type-IIa natural diamonds have been measured and are compared with previous results for 54.5-MeV electrons. Because of the presence of platelets precipitated along the (100) planes in the Type-Ia diamond, the energies of the (100) spectral peaks are shifted downward relative to those for the Type-IIa diamond. We have developed a model to explain this effect.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.334433
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