C-band high-power multi-beam klystron with reverse permanent magnet
-
摘要: 反转永磁聚焦C波段高功率多注速调管作为加速器系统的功率源,具有脉冲输出功率高、平均功率大、寿命长的优势,在工业辐照、放射治疗、无损检测等领域具有广阔的应用前景。设计并研发了一种可用于加速器系统的反转永磁聚焦C波段高功率多注速调管。其电子光学系统采用多电子注、周期反转永磁聚焦技术,高频系统工作在TM220高次模式、多腔参差调谐,散热采用水冷方式。通过计算确定了结构参数,研制出速调管样管,通过测试,获得了大于3 MW的峰值输出功率,和计算结果相吻合。Abstract: Based on the fundamental principle oriented from the single beam klystron, multi-beam klystron can make higher peak output power under a lower working voltage with the help of parallel working mode combining several low perveance electron beams. Lower working voltage also makes a contribution to the compact design of the whole system. In the linac system design, input power source is the key factor that determines the composition of the whole system. The increasement of the source power can shorten the linac tube dramatically, thus make the brand-new application scenarios possible such as the high-degree freedom cancer treatment or the compact nondestructive testing system. The C-band multi-beam klystron in this article mainly targets on the low and medium energy accelerator applications, which can give out the microwave power at higher rep-rate (500 Hz) and higher working ratio (0.2%).
-
Key words:
- accelerator power source /
- multi-beam klystron /
- reverse permanent magnet
-
表 1 主要的技术参数
Table 1. Main technical parameters of the klystron
frequency/MHz Voltage/kV electric current/A bandwidth/MHz peak power/MW average power/kW gain/dB efficiency/% 5712 ≤50 ≤150 30 ≥3 ≥6 ≥45 ≥40 表 2 矩形谐振腔谐振模式
Table 2. Resonant mode of rectangular cavity
No. mode frequency/MHz polar direction 1 TM010 4107 2 TM210 4879 x 3 TM210 4890 y 4 TM220 5712 5 TM310 8345 x 6 TM310 8850 y -
[1] Jr Gilmour A S. Klytrons, travling wave tubes, magnetrons, crossed-field amplifiers, and gyrotrons[M]. Norwood: Artech House, 2011:80-94. [2] Wang Yong, Zhang Rui, Fan Junjie, et al. Development of high peak power multi-beam klystron[J]. Journal of Microwaves, 2012(s2):171-174. [3] Komarov D A, Yakushkin E P, Paramonov Y N, et al. Development of a C-band high power amplifier klystron for linear electron accelerators[C]//IEEE International Vacuum Electronics Conference. 2017. [4] 丁耀根. 大功率速调管的设计制造和应用[M]. 北京: 国防工业出版社, 2010: 82-90.Ding Yaogen. Design, manufacture and application of high power klystron[M]. Beijing: National Defense Industry Press, 2010: 82-90 [5] 丁耀根. 大功率速调管的理论和计算模拟[M]. 北京: 国防工业出版社, 2008:197-208.Ding Yaogen. Theory and computer simulation of high-power klystron[M]. Beijing: National Defense Industry Press, 2008: 197-208 [6] Liu Zening, Shi Jiaru, Peng Maomao, et al. Design of a C-band high-efficiency multi beam klystron[C]//Proceeding of IPAC. 2017: 4221-4223. [7] Frejdovich I A, Nevsky P V, Sakharov V P, et al. Application of the multi-beam klystrons with reverse permanent magnet focusing system in RF systems of the compact electron accelerators[C]//IEEE International Vacuum Electronics Conference. 2006. [8] Frejdovich I A, Nevsky P V, Sakharov V P, et al. Multi-beam klystrons with reverse permanent magnet focusing system as the universal RF power sources for the compact electron accelerators[C]//Proceedings of RuPAC. 2006: 100-102. [9] 王树忠, 丁耀根, 肖刘. PRPM聚焦多注速调管电子光学系统的研究[J]. 电子与信息学报, 2006(10):1967-1970. (Wang Shuzhong, Ding Yaogen, Xiao Liu. Study on the electron optical system of multi beam klystron with PRPM focusing[J]. Journal of Electronics & Information Technology, 2006(10): 1967-1970 [10] 电子管设计手册编辑委员会. 微波管电子光学系统设计手册[M]. 北京: 国防工业出版社, 1981: 213-217.Electronic Tube Design Manual Editorial Committee. Design manual for electron optical system of microwave tube[M]. Beijing: National Defense Industry Press, 1981: 213-217. [11] Akimov P I, Balabanov A K, Chudin V G, et al. C-band multy-beam klystron with reversal focusing system on permanent magnets for electron accelerators [C]// IEEE International Vacuum Electronics Conference. 2014. [12] 周碎明. 高次模式多注速调管[J]. 真空电子技术, 2008(4):7-12. (Zhou Suiming. High order mode multi beam klystron[J]. Beijing Vacuum Electronics Research Institute, 2008(4): 7-12 doi: 10.3969/j.issn.1002-8935.2008.04.002 [13] 陈新桥, 朱允淑, 丁耀根. TM220高次模多注速调管矩形谐振腔[J]. 真空电子技术, 2002(4):44-47. (Chen Xinqiao, Zhu Yunshu, Ding Yaogen. Rectangle cavity of TM220 high mode multi-beam klystron[J]. Beijing Vacuum Electronics Research Institute, 2002(4): 44-47 doi: 10.3969/j.issn.1002-8935.2002.04.008 [14] 柏伟, 沈旭明, 陈亚男, 等. C波段加速器初步热测实验[J]. 强激光与粒子束, 2012, 24(1):181-183. (Bo Wei, Shen Xuming, Chen Yanan, et al. Preliminary power test on C-band accelerator[J]. High Power Laser and Particle Beams, 2012, 24(1): 181-183 doi: 10.3788/HPLPB20122401.0181 [15] 柏伟. C波段加速器装置研制[C]//中国工程物理研究院科技年报. 2015.Bo Wei. Development of C-band accelerator system[C]//Annual Report of China Academy of Engineering Physics. 2015