Performance of S band four-cavity relativistic klystron amplifier

Cheng Hui; Xie Hongquan; Li Zhenghong; Liu Yinghui; Chen Yongdong; Wu Yang

doi:10.3788/HPLPB20132508.2050

Volume 25 Issue 08

Nov. 2013

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Article Navigation > High Power Laser and Particle Beams > 2013 > 25(08): 2050-2054

Cheng Hui, Xie Hongquan, Li Zhenghong, et al. Performance of S band four-cavity relativistic klystron amplifier[J]. High Power Laser and Particle Beams, 2013, 25: 2050-2054. doi: 10.3788/HPLPB20132508.2050

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Cheng Hui, Xie Hongquan, Li Zhenghong, et al. Performance of S band four-cavity relativistic klystron amplifier[J]. High Power Laser and Particle Beams, 2013, 25: 2050-2054. doi: 10.3788/HPLPB20132508.2050

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Performance of S band four-cavity relativistic klystron amplifier

doi: 10.3788/HPLPB20132508.2050

1.
School of Physical Electronics,University of Electronic Science and Technology of China,Chengdu 610054,China;
2.
Science and Technology on High Power Microwave Laboratory,Institute of Applied Electronics,CAEP,P.O.Box 919-1015,Mianyang 621900,China;
3.
College of Science,Southwest University of Science and Technology,Mianyang 621010,China;
4.
School of Science,Sichuan University of Science and Engineering,Zigong 643000,China

Received Date: 2012-12-07
Rev Recd Date: 2013-03-12
Publish Date: 2013-06-19

Abstract

Abstract

In a relativistic klystron amplifier (RKA), the idle cavity can increase the gain of the device, but the oscillation of nonworking modes will occur in the same time, and therefore the performance of RKA will be significantly decreased. We developed a four-cavity relativistic klystron on the basis of three-cavity relativistic klystron to study the mechanism of nonworking modes oscillation. A PIC particle simulation software was used to study the cold cavity structure, beam-microwave interaction and microwave extraction of output cavity. An input cavity with low interaction impedance and a ladder structured drift were adopted in the structure to avoid nonworking modes oscillation. By optimizing the output cavity gap, the returning electrons had been significantly reduced, and thus the oscillation of nonworking modes was not excited. Finally, the output microwave with a power of 3.7 GW, a gain of 56 dB, an efficiency of 22% and 1 dB bandwidth of 74 MHz were achieved in simulation with the discussed structure.
- relativistic klystron,
- four-cavity,
- oscillation of nonworking frequency,
- particle simulation

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