Instability of relativistic electron-beam–dielectric system as a mechanism for microwave generation

Journal of Applied Physics - Tập 102 Số 10 - 2007
Lingbao Kong1, Chao‐Hai Du1, Pu‐Kun Liu2, Xiao Liu2
1Institute of Electronics and Graduate University , Chinese Academy of Sciences, P.O. Box 2652, 100080 Beijing, People’s Republic of China
2Institute of Electronics , Chinese Academy of Sciences, P.O. Box 2652, 100080 Beijing, People’s Republic of China

Tóm tắt

The dispersion relation of relativistic rectilinear electron beam propagating along a guide magnetic field in a dielectric is investigated by cold fluid model. In such a system, due to anomalous Doppler effect, the instability occurs when the electron velocity exceeds the wave phase velocity. The growth rate and spatial growth rate are studied analytically and the nonlinear saturated efficiency is given analytically for the first time. Numerical results show that the saturated efficiency approaches about 10%–30%. The distinctive interaction mechanism is promising for the design of a new kind of compact high-power microwave generation devices.

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Journal of Applied Physics

Tập 102 Số 10

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