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  • 1990-1994  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Study of a plasma-filled X-band backward wave oscillator (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 2332-2334 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present experimental studies of a plasma-filled X-band backward wave oscillator (BWO). Depending on the background gas pressure, microwave frequency upshifts of up to 1 GHz appeared along with an enhancement of a factor of 7 in the total microwave power emission. The bandwidth of the microwave emission increased from ≤0.5 to 2 GHz when the BWO was working at the rf power enhancement pressure region. The rf power enhancement appeared over a much wider pressure range in a high beam current case (10–100 mT for 3 kA) as compared to a lower beam case (80–115 mT for 1.6 kA). The plasma-filled BWO has higher power output compared to the vacuum BWO over a broader region of magnetic guide field strength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107017
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Statistics of strongly turbulent electric fields (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1914-1916 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A frequently observed exponential distribution for the probability distribution of strongly turbulent Langmuir fields, P(E,t), may arise from dissipative processes. Experiments show that the distribution is time stationary within the 100 nsec observed resolution, and exhibits exponential time decay after the beam driver ceases. Microwave emission also ceases, compatibly with a beam origin. Return current measures imply that ion waves are much weaker than Langmuir turbulence. Interactions at ion sound wave speeds can mediate the observed μsec decay, and may also adjust P(E) when the beam driver is on.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860774
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    Paper (German National Licenses)
    Fulltext
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