Simulation of pulse shortening in a relativistic klystron oscillator
- Univ. of California, Berkeley, CA (United States). Electronics Research Lab.
The relativistic klystron is a strong candidate for a high power microwave source for a number of applications, including accelerators and electronic warfare. In this work, the authors simulate a high power, high perveance relativistic klystron oscillator using a 2d PIC-MCC code. The experimental klystron is currently operating as an injection-locked oscillator at 1.25--1.35 GHz, with up to 1 GW rms output power for a 100 ns pulse. The beam voltage is 500 kV, with current of 10 kA, and a beam pulse length of 300 ns. Experimental evidence indicates the klystron behavior is azimuthally symmetric. Of particular interest for this device is the shortening of the rf pulse compared to the current pulse, which may be related to plasma formation near the extractor gap. Various gases liberated form the porous graphite beam dump may reach substantial pressures locally. The authors investigate the formation of plasma due to photoionization and electron impact ionization of the gas constituents, and its impact on the rf power output. The simulations are compared to the experimental data where available.
- Sponsoring Organization:
- Department of the Air Force, Washington, DC (United States); Office of Naval Research, Washington, DC (United States)
- OSTI ID:
- 435520
- Report Number(s):
- CONF-960634--
- Country of Publication:
- United States
- Language:
- English
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