Nonlinear interaction between modulated electron beam and the intermediate cavity of RKA

Chen Yong-Dong; Wu Yang; Xie Hong-Quan; Li Zheng-Hong; Zhou Zi-Gang

doi:10.7498/aps.62.104104

Abstract

In the relativistic klystron driven by intense relativistic electron beam, due to the influences of intense current and high electric field, especially the high Q value for the intermediate cavity, the nonlinear interaction between the intermediate cavity and the electron beam is very strong. It will significantly affect the performance of the device. According to the Maxwell equations and one-dimensional motion equation of electron, the self-consistent equation of the beam-wave interaction is obtained in the intermediate cavity. Based on these equations, the influences of the modulation depth and the modulation frequency on the amplitude and phase of gap voltage are studied respectively. The voltage amplitude obtained by the self-consistent equation is close to the voltage amplitude of particle in cell simulation, especially under the higher modulation depth compared with that obtained from the equivalent circuit model of conventional klystron. Meanwhile, the bandwidth of device becomes wide with the increase of the modulation depth. Finally, an S-band high-gain RKA is designed, and the corresponding experiments are done on the LTD accelerator. The output power with 1.1 GW is obtained, the gain is 49 dB.

Keywords:

Authors and contacts

1.
College of Science, Sichuan University of Science and Engineering, Zigong 643000, China;
2.
Science and Technology on High Power Microwave Laboratory, Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621900, China;
3.
College of Science, Southwest University of Science and Technology, Mianyang 621010, China
Funds: Project supported by the National Natural Science Foundation of China (Grant No. 61271109).

References

[1]	Uhm H S, Kim H S 2001 Appl. Phys. 89 4224
[2]	Friedman M, Serlin V 1988 Appl. Phys. 58 1460
[3]	Uhm H S 1993 Phys. Fluids B 5 2343
[4]	Nusinovich G, Read M, Song L Q 2004 Phys. Plasmas 11 4894
[5]	Wu Y, Xu Z, Jin X, Chang A B, Li Z H, Huang H, Liu Z, Luo X, Ma Q S, Tang C X 2011 Acta Phys. Sin. 60 044102 (in Chinese) [吴洋, 许州, 金晓, 常安碧, 李正红, 黄华, 刘忠, 罗雄, 马乔生, 唐传祥 2011 60 044102]
[6]	Carlsten B E, Faehl R J, Fazio M V, Haynes W B, Ryne R D, Stringfield R M 1994 IEEE Trans. Plasma Sci. 22 730
[7]	Ding Y G 2008 Theory and Computer Simulation of High Power Klystron (Beijing: Nation Defense Industry Press) p74 (in Chinese) [丁耀根 2008 大功率速调管的理论与计算模拟 (北京: 国防工业出版社) 第63页]
[8]	Li Z H, Meng F B, Chang A B, Huang H, Ma Q S 2005 Acta Phys. Sin. 54 3578 (in Chinese) [李正红, 孟凡宝, 常安碧, 黄华, 马乔生 2005 54 3578]

Cited By

[1]	Uhm H S, Kim H S 2001 Appl. Phys. 89 4224
[2]	Friedman M, Serlin V 1988 Appl. Phys. 58 1460
[3]	Uhm H S 1993 Phys. Fluids B 5 2343
[4]	Nusinovich G, Read M, Song L Q 2004 Phys. Plasmas 11 4894
[5]	Wu Y, Xu Z, Jin X, Chang A B, Li Z H, Huang H, Liu Z, Luo X, Ma Q S, Tang C X 2011 Acta Phys. Sin. 60 044102 (in Chinese) [吴洋, 许州, 金晓, 常安碧, 李正红, 黄华, 刘忠, 罗雄, 马乔生, 唐传祥 2011 60 044102]
[6]	Carlsten B E, Faehl R J, Fazio M V, Haynes W B, Ryne R D, Stringfield R M 1994 IEEE Trans. Plasma Sci. 22 730
[7]	Ding Y G 2008 Theory and Computer Simulation of High Power Klystron (Beijing: Nation Defense Industry Press) p74 (in Chinese) [丁耀根 2008 大功率速调管的理论与计算模拟 (北京: 国防工业出版社) 第63页]
[8]	Li Z H, Meng F B, Chang A B, Huang H, Ma Q S 2005 Acta Phys. Sin. 54 3578 (in Chinese) [李正红, 孟凡宝, 常安碧, 黄华, 马乔生 2005 54 3578]

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