Development of grid-controlled electron gun for Rhodotron

Qin Zhen; Liu Ping; Li Chen; Tang Ruo; Zhao Wei; Chen Xin; Yang Jie; Xiang Jun; Li Tiantao; Huang Gang; He Xiaozhong

doi:10.11884/HPLPB202537.240286

Volume 37 Issue 4

Mar. 2025

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Qin Zhen, Liu Ping, Li Chen, et al. Development of grid-controlled electron gun for Rhodotron[J]. High Power Laser and Particle Beams, 2025, 37: 044005. doi: 10.11884/HPLPB202537.240286

Citation:

Qin Zhen, Liu Ping, Li Chen, et al. Development of grid-controlled electron gun for Rhodotron[J]. High Power Laser and Particle Beams, 2025, 37: 044005. doi: 10.11884/HPLPB202537.240286

Qin Zhen, Liu Ping, Li Chen, et al. Development of grid-controlled electron gun for Rhodotron[J]. High Power Laser and Particle Beams, 2025, 37: 044005. doi: 10.11884/HPLPB202537.240286

Citation:

Qin Zhen, Liu Ping, Li Chen, et al. Development of grid-controlled electron gun for Rhodotron[J]. High Power Laser and Particle Beams, 2025, 37: 044005. doi: 10.11884/HPLPB202537.240286

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Development of grid-controlled electron gun for Rhodotron

doi: 10.11884/HPLPB202537.240286

Institute of Fluid Physics, CAEP, Mianyang 621900, China

Received Date: 2024-08-27
Accepted Date: 2025-01-09
Rev Recd Date: 2025-01-09

Available Online: 2025-02-08

Publish Date: 2025-04-15

Abstract

Abstract

The Rhodotron is a compact and highly efficient accelerator. This accelerator requires an electron gun with high repetition frequency, short pulses and low emittance, to ensure optimal acceleration performance. This paper shows the physical design, simulation, prototype development and beam testing of such an electron gun. The electron gun is designed as a grid-controlled electron gun based on a barium-tungsten thermionic cathode. The electron gun adopts a Pierce structure. It has a cathode voltage of −40 kV, an operating repetition frequency of 10.75 MHz, a design emission current of 200 mA maximum, and a single minimum pulse length of 3 ns. In the actual test, the electron gun measured a peak emission current of 204 mA with the cathode heater operating at 0.95 A/6.7 V, loaded cathode DC voltage −40 kV, and gate control voltage 290 V/10 MHz. When the beam pulse length is 2.7 ns, the beam current amplitude is 39.2 mA, and the actual beam emittance is less than 2 mm mrad. This result meets the design and accelerator application requirements.
- Rhodotron,
- electron gun,
- grid-controlled,
- thermionic cathode,
- beam test,
- emittance

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References(15)

References

[1]	Pottier J. A new type of rf electron accelerator: the rhodotron[J]. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1989, 40/41: 943-945.
[2]	He Xiaozhong, Yang Liu, Liao Shuqing, et al. A proposal of using improved rhodotron as a high dose rate micro-focused X-ray source[C]//Proceedings of the 13th Symposium on Accelerator Physics. 2017: 28-30.
[3]	刘波, 顾孟平, 池云龙, 等. BEPC实验电子枪系统的研究[J]. 高能物理与核物理, 2005, 29(5):507-511 doi: 10.3321/j.issn:0254-3052.2005.05.015 Liu Bo, Gu Mengping, Chi Yunlong, et al. Study on BEPC experimental electron gun system[J]. High Energy Physics and Nuclear Physics, 2005, 29(5): 507-511 doi: 10.3321/j.issn:0254-3052.2005.05.015
[4]	Zhou Zusheng, He Dayong, Chi Yunlong. Electron gun system for NSC KIPT linac[J]. Chinese Physics C, 2014, 38: 067006. doi: 10.1088/1674-1137/38/6/067006
[5]	钱民权, 杨茂荣, 潘清, 等. 激光驱动的光阴极研究[J]. 强激光与粒子束, 1997, 9(2):185-191 Qian Minquan, Yang Maorong, Pan Qing, et al. Investigation of photocathode driven by a laser[J]. High Power Laser and Particle Beams, 1997, 9(2): 185-191
[6]	廖树清, 何小中, 杨柳, 等. 大功率花瓣加速器X射线闪光放射治疗设备设计研究[J]. 中国医学装备, 2024, 21(1):21-23,28 doi: 10.3969/j.issn.1672-8270.2024.01.004 Liao Shuqing, He Xiaozhong, Yang Liu, et al. Study on the design of X-ray Flash-RT equipment with high power petal accelerator[J]. China Medical Equipment, 2024, 21(1): 21-23,28 doi: 10.3969/j.issn.1672-8270.2024.01.004
[7]	夏乾旭, 赵全堂, 宗阳, 等. 325MHz微波栅控高压型热阴极电子枪的设计研究[J]. 强激光与粒子束, 2021, 33:044009 doi: 10.11884/HPLPB202133.200310 Xia Qianxu, Zhao Quantang, Zong Yang, et al. Design of 325 MHz RF grid-controlled high voltage thermionic cathode electron gun[J]. High Power Laser and Particle Beams, 2021, 33: 044009 doi: 10.11884/HPLPB202133.200310
[8]	He Xiaozhong, Yang Liu, Liao Shuqing, et al. Rhodotron and rotating target: a solution towards micro-spot for high energy and high dose rate bremsstrahlung sources[J]. Applied Radiation and Isotopes, 2022, 189: 110446. doi: 10.1016/j.apradiso.2022.110446
[9]	Humphries S Jr. Charged particle beams[M]. New York: Dover Publications, 2013: 147-150.
[10]	Herrmannsfeldt W B. EGUN: an electron optics and gun design program[R]. SLAC-331, 1988.
[11]	李崇山, 夏福根, 边伟. 关于无截获栅电子枪栅网形状的研究[J]. 电子与信息学报, 1983, 5(2):116-123 Li Chongshan, Xia Fugen, Bian Wei. Research on grid-mesh shapes of non-intercepting gridded guns[J]. Journal of Electronics & Information Technology, 1983, 5(2): 116-123
[12]	王汉斌, 杨兴繁, 潘清, 等. 光阴极直流高压电子枪工程设计[J]. 强激光与粒子束, 2013, 25(s0):145-148 Wang Hanbin, Yang Xingfan, Pan Qing, et al. Engineering design of photoemission DC high voltage electron gun[J]. High Power Laser and Particle Beams, 2013, 25(s0): 145-148
[13]	Liu Bo, Gu Mengping, Chi Yunlong. Design of the BEPCII electron gun system[J]. High Power Laser and Particle Beams, 2006, 18(10): 1682-1686.
[14]	Piot P, Song J, Li R, et al. A multislit transverse-emittance diagnostic for space-charge-dominated electron beams[C]//Proceedings of the 1997 Particle Accelerator Conference. 1997: 2204-2206.
[15]	Zhang Min. Emittance formula for slits and pepper-pot measurement[R]. FERMILAB-TM-1988, 1996.