25 July 1989 High Power Microwave Generation From Plasma-Filled Backward-Wave Oscillators
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Abstract
Experimental and theoretical studies of high power microwave generation from three different plasma-filled backward-wave oscillator (BWO) configurations are reported. In the first, a neutral fill gas inside the BWO slow wave structure is ionized by the electron beam and a resonant enhancement of microwave output is observed at optimum values of fill gas pressure and applied axial magnetic field. In the second, a low energy electron beam is used to preionize the fill gas in advance of electron beam injection. In the third configuration, plasma is injected into the slow wave structure in advance of beam injection using a Marshall plasma gun. A fivefold increase in microwave output power and efficiency is observed in this case. Possible theoretical explanations for the observed interaction enhancement are also discussed.
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W. W. Destler, W. W. Destler, Y. Carmel, Y. Carmel, V. L. Granatstein, V. L. Granatstein, K. Minami, K. Minami, D. Abe, D. Abe, W. R. Lou, W. R. Lou, R. A. Kehs, R. A. Kehs, } "High Power Microwave Generation From Plasma-Filled Backward-Wave Oscillators", Proc. SPIE 1061, Microwave and Particle Beam Sources and Directed Energy Concepts, (25 July 1989); doi: 10.1117/12.951764; https://doi.org/10.1117/12.951764
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