RF system of a 220 GHz extended interaction klystron

Wang Zicheng; Qu Zhaowei; Shang Xinwen; Cao Linlin; Tang Bojun; Xiao Liu

doi:10.11884/HPLPB201931.180312

Volume 31 Issue 8

Aug. 2019

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Article Navigation > High Power Laser and Particle Beams > 2019 > 31(8): 083101

Yang Hao, Le Bo, Yan Eryan, et al. Analysis and calculation of damping used in random coupling model[J]. High Power Laser and Particle Beams, 2017, 29: 103202. doi: 10.11884/HPLPB201729.170152

Citation:

Wang Zicheng, Qu Zhaowei, Shang Xinwen, et al. RF system of a 220 GHz extended interaction klystron[J]. High Power Laser and Particle Beams, 2019, 31: 083101. doi: 10.11884/HPLPB201931.180312

Yang Hao, Le Bo, Yan Eryan, et al. Analysis and calculation of damping used in random coupling model[J]. High Power Laser and Particle Beams, 2017, 29: 103202. doi: 10.11884/HPLPB201729.170152

Citation:

Wang Zicheng, Qu Zhaowei, Shang Xinwen, et al. RF system of a 220 GHz extended interaction klystron[J]. High Power Laser and Particle Beams, 2019, 31: 083101. doi: 10.11884/HPLPB201931.180312

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RF system of a 220 GHz extended interaction klystron

doi: 10.11884/HPLPB201931.180312

1.
Institute of Electronics, Chinese Academy of Sciences, Beijing 101400, China
2.
Graduate University of Chinese Academy of Sciences, Beijing 100039, China

Received Date: 2018-11-10
Rev Recd Date: 2019-03-12
Publish Date: 2019-08-15

Abstract

Abstract

An extended interaction klystron (EIK), which is composed of an input cavity and an output cavity both based on 8 periods of staggered double rectangular waveguide structure (SDRWS) and an intermediate cavity based on 6 periods of SDRWS, is calculated in detail on computer.After calculating reflection coefficient S11 of the input cavity and output cavity and the eigenmodes of the intermediate cavity, the structural parameters of the input cavity and output cavity and the intermediate cavity are determined, then PIC simulation is done to predict the EIK's performance, the results show that the EIK has an 1 GHz 3 dB bandwidth (219.5-220.5 GHz), a 456 W maximum power and a 40.06 dB maximum gain.Furthermore, stagger tuning by adjusting the structural parameter aof the intermediate cavity is performed to analyse howaaffects the EIK's performances, and the results show that the 3 dB band of the EIK mainly depends on the passband of the input cavity and output cavity, it also depends on the resonant frequency of the intermediate cavity in some cases.When the resonant frequency of the intermediate cavity is located at the lower or higher ends of the passband of the input cavity and output cavity, the 3 dB band of the EIK may be extended to certain extent.Particularly, when the resonant frequency of the intermediate cavity is located at or beyond the higher ends of the passband of the input cavity and output cavity, it is verified that the EIK has steady output signal featuring with pure spectrum and flat gains over the 3 dB band.The final results of the stagger tuning show that, when the structural parameter aof the intermediate cavity is 0.747 mm, the EIK reaches almost the optimum performances, with an 1.2 GHz3 dB bandwidth (219.5-220.7 GHz), a 630 W maximum power companied with a 11.3%efficiency, and a 47 dB maximum gain.
- extended interaction klystron,
- stagger tuning,
- staggered double rectangular waveguide structure,
- broadband,
- PIC simulation

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References(20)

References

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