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Because non-working modes are very easy to excit in the high gain relativistic klystron amplifier, and seriously affect the beam-wave interactive action, the suppressing of non-working modes is very important. These modes can seriously degrade klystron performance and cause the pulse shortening, the normal operation of HGRKA will be affected greatly. This paper deals with the mechanism of non-working mode self-excitation by the PIC simulation, and it is obvious that the coupling between cavities is the main cause of non-working mode self-excitation. The coupling can form the positive feedback loop. The formula for starting current of non-working mode self-excitation is developed according to the coupling between cavities, and the corresponding measures are taken to avoid non-working mode self-excitation. Then the corresponding simulations and optimization are conducted. Finally non-working mode control is realized in the HGRKA experimentally when driven power is only few kilowatts. The RF output has a power of 0.98 GW and pulse width of 100 ns.
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Keywords:
- high power microwaves /
- high gain RKA /
- non-working modes oscillation
[1] Benford J, Swegle J A, Schamiloglu E (Translated by Jiang W H, Zhang C 2009 High Power Microwaves (2nd Ed.) (Beijing: National Defence Industry Press) p1-10 [Benford J, Swegle J A, Schamiloglu E 著, 江伟华, 张弛译 2009 高功率微波 (北京: 国防工业出版社)第1—10页]
[2] Li Z H, Jin X, Meng F B 2010 Scientia Sinica 6 753 (in Chinese) [李正红, 金晓, 孟凡宝 2010 中国科学 6 753]
[3] Huang H, Fan Z K, Tan J 2004 Acta Phys Sin. 53 1129 (in Chinese) [黄华, 范植开, 谭杰 2004 53 1129]
[4] Roybal W T 2005 Ph. D Dissertation (America: University of New Mexico) p102
[5] Han Sup Uhm 1993 Phys. Fluids B 22(5)
[6] Nusinovich G, Read M, Song L Q 2004 Phys. Plasmas 11 4893
[7] 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]
[8] Xie J L, Zhao Y X 1966 Bunching theory of klystron (Beijing: Science Press) p63 (in Chinese) [谢家麟, 赵永翔, 1996 速调管群聚理论 (北京:科学出版社) 第63页]
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[1] Benford J, Swegle J A, Schamiloglu E (Translated by Jiang W H, Zhang C 2009 High Power Microwaves (2nd Ed.) (Beijing: National Defence Industry Press) p1-10 [Benford J, Swegle J A, Schamiloglu E 著, 江伟华, 张弛译 2009 高功率微波 (北京: 国防工业出版社)第1—10页]
[2] Li Z H, Jin X, Meng F B 2010 Scientia Sinica 6 753 (in Chinese) [李正红, 金晓, 孟凡宝 2010 中国科学 6 753]
[3] Huang H, Fan Z K, Tan J 2004 Acta Phys Sin. 53 1129 (in Chinese) [黄华, 范植开, 谭杰 2004 53 1129]
[4] Roybal W T 2005 Ph. D Dissertation (America: University of New Mexico) p102
[5] Han Sup Uhm 1993 Phys. Fluids B 22(5)
[6] Nusinovich G, Read M, Song L Q 2004 Phys. Plasmas 11 4893
[7] 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]
[8] Xie J L, Zhao Y X 1966 Bunching theory of klystron (Beijing: Science Press) p63 (in Chinese) [谢家麟, 赵永翔, 1996 速调管群聚理论 (北京:科学出版社) 第63页]
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