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  • American Institute of Physics (AIP)  (814)
  • Nature Publishing Group  (242)
  • 1985-1989  (1,056)
  • 1985  (1,056)
  • 1
    Electronic Resource
    Electronic Resource
    TFTR Thomson scattering system (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1015-1017 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The TFTR Thomson scattering system has been operational since January 1984. The diagnostic uses two ruby lasers and two spectrometer-detector systems to provide profiles at two times in a discharge. The two scattering lines consist of 76 spatial channels which span the 200-cm vacuum vessel along a major radius. The detectors are gated, intensified CCD arrays with single photoelectron sensitivity. Te(R) and Ne(R) profiles are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138255
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  • 2
    Electronic Resource
    Electronic Resource
    Approaches to ultrafast neutron detectors (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1096-1097 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We discuss two approaches to obtain neutron detectors of very high temporal resolution. In the first approach, a uranium-coated cathode is used in a streak tube configuration. Secondary electrons accompanying the fission fragments from a neutron-uranium reaction are accelerated, focused through a pinhole, and streaked. Calculations show that 20-ps time resolution can be obtained. In the second approach, a uranium-coated cathode is integrated into a transmission line. State-of-the-art technology indicates that a time resolution of 20 ps can be obtained by gating the cathode with a fast electric pulse.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138234
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetostatic wave propagation losses in thorium-substituted YIG (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3724-3726 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: YIG films were grown with thorium added to the melt in varying concentrations with a maximum Th/Y ratio of 0.487. The effect of the addition of thorium on the propagation of magnetostatic forward volume waves at X band was studied using a differential path delay line. It was found that the addition of thorium increased the propagation loss. For Th/Y ratios greater than 0.0428, magnetostatic forward volume waves could not be detected after propagation over a 1-cm path length. Although the variations in thorium content resulted in a range of lattice mismatches including both positive and negative values, there was no observable minimum in the loss corresponding to zero mismatch. It was also observed that the addition of thorium increased the dc conductivity, but calculations showed that the conductivity was not large enough to produce significant eddy current losses. We feel that the addition of thorium increased the amount of Fe2+ present in the films, thus activating the valence-exchange loss mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334949
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  • 4
    Electronic Resource
    Electronic Resource
    Relationship between peroxyacetyl nitrate and nitrogen oxides in the clean troposphere (1985)
    [s.l.] : Nature Publishing Group
    Nature 318 (1985), S. 347-349 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The measurements were made at the C-l research site of the Mountain Research Station of the University of Colorado (402' N lat, 10532' W long., 3.05-km elevation above sea level). Prevailing winds at this site are from the west and are relatively free of anthropogenic pollution. However, there are ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/318347a0
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  • 5
    Electronic Resource
    Electronic Resource
    New injection mode infrared detector (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 5525-5528 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new injection pulse phenomenon is reported which may have a variety of applications including the detection of infrared (IR) radiation. Injection current pulses were observed in simple circuits containing forward biased silicon p-i-n diodes at liquid-helium temperatures. Under exposure to IR radiation, the pulse rate was observed to increase approximately linearly with increasing incident IR intensity. The substantial voltage, current, and power output may eliminate the need for on-chip amplifiers in many applications. Figures of merit are discussed, although the performance of the devices has not yet been optimized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334831
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  • 6
    Electronic Resource
    Electronic Resource
    Comparison of magnetostatic surface wave propagation characteristics at 77 and 299 K (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 4449-4451 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The propagation of magnetostatic surface waves in yttrium iron garnet at 77 K is reported. The bandwidth was increased by about 60%, the dispersion was reduced, and the required bias field for a given frequency of operation was decreased by over 20% as compared to room-temperature results. These results can be explained by the increase in the magnetization of yttrium iron garnet at 77 K. In addition, the minimum delay line insertion loss was reduced by 1–2 dB at the lower temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336276
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  • 7
    Electronic Resource
    Electronic Resource
    Direct measurement of the energy distribution of hot electrons in silicon dioxide (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 1302-1313 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The energy distribution of hot electrons in high-field stressed amorphous silicon dioxide (SiO2) films have been measured using a vacuum emission technique. Electrons having average energies (approximately-greater-than)2 eV and an energy relaxation length of λ≈32 A(ring) are observed at all fields studied ((approximately-greater-than) 2 MV/cm). However, contrary to previous theoretical expectations, the majority of carriers in the distribution remains stable at all fields. The results are in agreement with other recent experiments (electroluminescence and carrier separation) which only measure the average energy of hot electrons in SiO2 and with recent Monte Carlo transport calculations which include scattering by both optical and acoustic phonon modes. Results for varying SiO2 thickness, metal gate thickness, oxide composition, and metal gate composition will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336098
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  • 8
    Electronic Resource
    Electronic Resource
    Advances in laser fluorescence scattering with Balmer series dye lasers (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1012-1014 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The spatial distribution of neutral deuterium has been determined in a reversed field pinch by fluorescence scattering. The first series of measurements, with a resolution of 4 cm were made with the laser tuned to the Dα, n=2−3(6561 A(ring)) transition. The second set of measurements, with both 4 and 2 cm resolution were performed with the laser tuned to the Dβn=2−4(4861 A(ring)) wavelength. The improvement in signal to noise obtained was substantial, being increased by a factor of (approximately-equal-to)2.5 in general. This is believed to be the first such measurement at this wavelength. The advantages of using this transition are such that this technique can be extended to measure the electron density near the plasma edge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138254
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  • 9
    Electronic Resource
    Electronic Resource
    Ultrafast turnoff laser triggered gating system for microchannel-plate intensified x-ray spectrometers (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 818-820 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A laser triggered photoconductive switch based microchannel-plate (MCP) gating system has been developed. The gating pulse provided to the MCP has a fall time on the order of 200 ps. Use of this system has resulted in increased signal-to-noise ratio on three MCP intensified x-ray spectrometers during recent x-ray experiments at the Novette laser facility. The x-ray signals of interest have a duration of approximately 300 ps while background in the same spectral region continues for several nanoseconds. As a result, signal-to-noise ratio is maximized by turning the MCP off just after the signals of interest are recorded. The MCP's are turned on by charging to approximately 1 kV with a slow rise-time (500 ns) pulse and rapidly gated off by a photoconductive switch connected to the MCP through transmission lines. Staggering the turnoff times of three microstrip lines across the MCP by 250 ps provides some time resolution. Details of the system, including pulse charging system, trigger beam delivery optics, and system diagnostics will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138183
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  • 10
    Electronic Resource
    Electronic Resource
    Multiple-frequency electron-cyclotron heating of hot-electron rings in a bumpy torus (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 1932-1936 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The use of multiple-frequency microwave power for electron-cyclotron heating significantly increased the ring stored energy in the SM-1 simple mirror device. Multiple-frequency electron-cyclotron heating (MFECH) was used on the ELMO Bumpy torus (EBT) in an effort to increase its hot-electron beta. No substantial improvement in the ring parameters was observed in a series of two-frequency ECH experiments, with frequency separations up to 90 MHz, in contrast to the dramatic improvement found in the axisymmetric SM-1 experiment. The toroidal canting of the EBT mirror sectors introduces asymmetries that destroy the superadiabatic behavior of the energetic electrons, reduce microwave heating efficiency, and produce additional ring losses. These effects qualitatively explain the different multiple-frequency heating results obtained in EBT and SM-1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.864937
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