Suppression of beam-induced pulse-shortening modes in high-power rf generator TW output structures

Jacob Haimson; B. Mecklenburg

doi:10.1117/12.137171

1 April 1992 Suppression of beam-induced pulse-shortening modes in high-power rf generator TW output structures

Jacob Haimson, B. Mecklenburg

Proceedings Volume 1629, Intense Microwave and Particle Beams III; (1992) https://doi.org/10.1117/12.137171
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

Several different style 11.4 GHz relativistic klystrons, operating with beam pulse widths of 50 ns and using large aperture, tapered phase-velocity TW structures, have recently demonstrated output RF power levels in the range of 100 to 300 MW without breakdown or pulse shortening. To extend this performance into the long pulse regime (1 microsecond(s) ) or to demonstrate a threefold increase in output power by using higher currents, the existing TW circuit designs must be modified (1) to reduce the cavity maximum surface E-fields by a factor of 2 to 3, and (2) to elevate the current threshold values of the beam induced higher order modes (HOM) to ensure avoidance of RF pulse shortening and associated instabilities. A technique for substantially elevating this threshold current is described, and microwave data and photographs are presented showing the degree of HOM damping achieved in a recently constructed 11.4 GHz TW structure.

Citation Download Citation

Jacob Haimson and B. Mecklenburg "Suppression of beam-induced pulse-shortening modes in high-power rf generator TW output structures", Proc. SPIE 1629, Intense Microwave and Particle Beams III, (1 April 1992); https://doi.org/10.1117/12.137171

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