New-type periodical permanent magnet focus system for G band extended interaction klystron

Wang Zicheng; Wang Yuankun; Qu Zhaowei

doi:10.11884/HPLPB202032.190364

Volume 32 Issue 6

May 2020

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Wang Zicheng, Wang Yuankun, Qu Zhaowei. New-type periodical permanent magnet focus system for G band extended interaction klystron[J]. High Power Laser and Particle Beams, 2020, 32: 063002. doi: 10.11884/HPLPB202032.190364

Citation:

Wang Zicheng, Wang Yuankun, Qu Zhaowei. New-type periodical permanent magnet focus system for G band extended interaction klystron[J]. High Power Laser and Particle Beams, 2020, 32: 063002. doi: 10.11884/HPLPB202032.190364

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New-type periodical permanent magnet focus system for G band extended interaction klystron

doi: 10.11884/HPLPB202032.190364

1.
Aerospace Information Research Institute,Chinese Academy of Sciences, Beijing 101400, China
2.
Institute of Information Engineering, Chinese Academy of Sciences, Beijing 100093, China
3.
School of Cyber Security, University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2019-09-18
Rev Recd Date: 2020-02-09
Publish Date: 2020-05-12

Abstract

Abstract

This paper proposes a new-type periodical permanent magnet (PPM) focus system, each half period of which is composed of 1 magnetic pole and 5 permanent magnets, and the first, the third and the fifth magnets have reverse magnetization with the second and the fourth magnets. Besides, any two magnets spaced half period have inverse magnetization with each other. The new-type PPM focus system is modeled and calculated by MTSS2018, the results show that the axial component B_z of the magnetic induction intensity on the axis has conspicuous amplitude of the third and the fifth space harmonics, and B_z rises steeply after it reaches zero, so B_z has a profile very approximate to the periodical rectangular shape. An electron gun under the condition of the above calculated B_z is calculated by MTSS2018 too, a beam with 22 kV of voltage, 215 mA current and 0.08 mm of maximum beam radius is obtained, which meets the demand of G band extended interaction klystron (EIK). In the calculations the peak value of B_z is only 1.2$ \sqrt 2 $B_B (subscript B is Brillouin magnetic field), it suggests that the new-type PPM focus system focuses the beam effectively even if it has a relatively lower peak value of B_z than the conventional PPM focus system does.
- extended interaction klystron,
- electron beam,
- tunnel of electron beam,
- periodical permanent magnet,
- PPM focus system

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References(11)

References

[1]	John H B, Richard J D, Colin D J, et al. Vacuum electronic high power terahertz sources[J]. IEEE Trans Terahertz Science and Technology, 2011, 1(1): 54-75. doi: 10.1109/TTHZ.2011.2151610
[2]	Albert R, Dave B, Mark H, et al. Sub-millimeter waves from a compact, low voltage extended interaction klystron[C]//Proc of IRMMW-THz. 2007: 1-3.
[3]	Mark H, Albert R, Peter H, et al. A compact, high power, sub-millimeter-wave extended interaction klystron[C]//Proc of IVEC. 2008: 297.
[4]	Peter H, Albert R, Richard D, et al. Compact sources of high RF power for DNP applications[C]. Proc of IVEC 2014: 221-222.
[5]	Albert R, Mark H, Peter H, et al. Development of sub-millimeter high power compact EIKs for DNP and radar applications[C]//Proc of IVEC. 2017: ID62
[6]	Richard D, Albert R, Peter H, et al. Design and fabrication of terahertz extended interaction klystrons[C]//Proc of IRMMW-THz. 2010: 1-3.
[7]	Richard D, Albert R, Peter H, et al. Fabrication techniques for a THz EIK[C]//Proc of IVEC. 2010: 181-182.
[8]	Zhang Kaichun, Wu Zhenhua, Liu Shenggang. Study of an extended interaction oscillator with a rectangular reentrance coupled-cavity in terahertz region[J]. J Infrared Milli Terahz Waves, 2009, 30: 308-318.
[9]	Qu Zhaowei, Zhang Zhiqiang, Ding Yaogen, et al. Research progress of a W-band 100-Watts extended interaction oscillator[C]// Proc of IVEC. 2017: ID94.
[10]	王自成, 唐伯俊, 谢文球, 等. 0.22 THz高效率行波管的互作用计算[J]. 强激光与粒子束, 2016, 28:023101. (Wang Zicheng, Tang Bojun, Xie Wenqiu, et al. RF system of a 220 GHz extended interaction klystron[J]. High Power Laser and Particle Beams, 2016, 28: 023101 doi: 10.11884/HPLPB201628.023101
[11]	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. Editorial Board of Designers’ Handbook on Electron Tubes. Designers’ handbook on electron optics system in microwave tubes[M]. Beijing: National Defense Industry Press, 1981