RF extraction issues in the relativistic klystron amplifiers

Victor Serlin; Moshe Friedman; Martin Lampe; Richard F. Hubbard

doi:10.1117/12.175743

13 May 1994 RF extraction issues in the relativistic klystron amplifiers

Victor Serlin, Moshe Friedman, Martin Lampe, Richard F. Hubbard

Proceedings Volume 2154, Intense Microwave Pulses II; (1994) https://doi.org/10.1117/12.175743
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

Relativistic klystron amplifiers (RKAs) were successfully operated at NRL in several frequency regimes and power levels. In particular, an L-band RKA was optimized for high- power rf extraction into the atmosphere and an S-band RKA was operated, both in a two-beam and a single-beam configuration. At L-band the rf extraction at maximum power levels (>= 15 GW) was hindered by pulse shortening and poor repeatability. Preliminary investigation showed electron emission in the radiating horn, due to very high voltages associated with the multi-gigawatt rf power levels. This electron current constituted an electric load in parallel with the radiating antenna, and precipitated the rf pulse collapse. At S-band the peak extracted power reached 1.7 GW with power efficiency approximately 50%. However, pulse shortening limited the duration to approximately 50 nanoseconds. The new triaxial RKA promises to solve many of the existing problems.

Citation Download Citation

Victor Serlin, Moshe Friedman, Martin Lampe, and Richard F. Hubbard "RF extraction issues in the relativistic klystron amplifiers", Proc. SPIE 2154, Intense Microwave Pulses II, (13 May 1994); https://doi.org/10.1117/12.175743

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