Influence of beam loading on the operation of the relativistic klystron amplifier

Moshe Friedman; Victor Serlin; Denis G. Colombant; Jonathan Krall; Yue Ying Lau

doi:10.1117/12.18539

1 April 1990 Influence of beam loading on the operation of the relativistic klystron amplifier

Moshe Friedman, Victor Serlin, Denis G. Colombant, Jonathan Krall, Yue Ying Lau

Proceedings Volume 1226, Intense Microwave and Particle Beams; (1990) https://doi.org/10.1117/12.18539
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

Abstract

Experiments in modulating an electron beam of power greater than 30 GW revealed a mechanism that limits the output RF power of the NRL relativistic klystron amplifier. This mechanism is beam loading of high voltage gaps. It is found that the presence of charge at the gaps is analogous to connecting a capacitor in parallel with the HV gap. This capacitor has a component that depends only on the electron density and on the geometry. Its presence causes detuning of the cavity, resulting in a slow build-up time for the electron beam modulation, saturation of the RF current amplitude and occasionally erratic fluctuations in the RF current. The nonlinear components of this capacitor cause the spectrum of the current modulation to be shifted toward the high frequencies.

Citation Download Citation

Moshe Friedman, Victor Serlin, Denis G. Colombant, Jonathan Krall, and Yue Ying Lau "Influence of beam loading on the operation of the relativistic klystron amplifier", Proc. SPIE 1226, Intense Microwave and Particle Beams, (1 April 1990); https://doi.org/10.1117/12.18539

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