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  • 1
    Electronic Resource
    Electronic Resource
    Long pulse CsI impregnated field emission cathodes (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1880-1882 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Intense pulsed electron beams are produced by applying a voltage between an anode and a cathode in a vacuum diode. The average field can be as low as 10 kV/cm, depending on the cathode material. This field is much less than predicted by the Fowler–Nordheim equation for field emission. The source for the electrons is a plasma that forms on the cathode which has a zero or very low work function. This plasma propagates into the anode–cathode gap and as a result lowers the impedance and eventually shorts the diode. The impregnation of the cathode surface with CsI was found to delay the onset of the diode impedance collapse. The time behavior of the impedance of a diode driven by 400-kV, 1-μs pulse was investigated. Three cathode materials with and without CsI were evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141112
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  • 2
    Electronic Resource
    Electronic Resource
    Operation of an X-band dielectric Cherenkov maser amplifier (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 1092-1094 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A dielectric Cherenkov maser has operated as an amplifier at a frequency of 9.8 GHz. The amplifier consisted of an electron beam interacting with the TM01 mode of a cylindrical, dielectric lined waveguide with the rf input provided by a tunable (9–10 GHz), 10 kW magnetron. The dielectric constant of the liner was 10 with inner and outer radii of 1.0 and 1.27 cm, respectively. At electron beam voltage and current of 190 kV and 90 A, respectively, the measured power gain of the amplifier was 11 dB over a 21 cm interaction length with a pulse length of approximately 1 μs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102577
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  • 3
    Electronic Resource
    Electronic Resource
    Generation of picosecond pulses at millimeter wavelengths (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 1483-1485 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report here on an experiment in which picosecond electron pulses, produced by a compact radiation frequency (rf) electron gun, were used to excite a rectangular waveguide, generating 5 ps pulses of radiation with a bandwidth of ∼200 GHz. The interaction of the electron pulses with the waveguide can be modeled quite simply by performing a harmonic expansion of the pulse train produced by the electron gun and employing Poynting's theorem to compute the power coupled into the modes of the waveguide by each harmonic. The resulting model for the distribution of spectral power yields good agreement with the observed spectrum. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114502
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Short-period comets and apollo-amor-aten type asteroids in view of tisserand invariant (1992)
    Springer
    Celestial mechanics and dynamical astronomy 54 (1992), S. 237-240 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00049556
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