Experimental research on a thermionic cathode RF gun with dual feed-in ports

Bai Wei; Li Ming; Wang Hanbin; Shan Lijun; Wu Dai; Wang Jianxin; Liu Yu; Shen Xuming

doi:10.11884/HPLPB201527.095103

Volume 27 Issue 09

Sep. 2015

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Article Navigation > High Power Laser and Particle Beams > 2015 > 27(09): 095103

Li Chunlin, Mao Xiaohui, Li Qing, et al. Development of controller and control system for HL-3 device’s electronic cyclotron long-pulse high-voltage power supply module[J]. High Power Laser and Particle Beams, 2025, 37: 035021. doi: 10.11884/HPLPB202537.240303

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Bai Wei, Li Ming, Wang Hanbin, et al. Experimental research on a thermionic cathode RF gun with dual feed-in ports[J]. High Power Laser and Particle Beams, 2015, 27: 095103. doi: 10.11884/HPLPB201527.095103

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Experimental research on a thermionic cathode RF gun with dual feed-in ports

doi: 10.11884/HPLPB201527.095103

1.
Institute of Applied Electronics,CAEP,Mianyang 621900,China

Received Date: 2015-03-30
Rev Recd Date: 2015-07-20
Publish Date: 2015-09-14

Abstract

Abstract

An independently tunable cells(ITC) thermionic cathode radio frequency (RF) gun is used as the injector for a compact FEL terahertz source in CAEP, and it is driven by microwaves through dual feed-in ports. One microwave feed-in port is located at the first cavity to excite the cavity and draw electron out from the cathode surface. Another is located at the last cavity to excite the rest cavities through coupling holes, There is no electromagnetic coupling between the two microwave feed-in ports. With regard to this kind of microwave working, the phase and amplitude of the electric field in the first cavity can be adjustable independently. Therefore the power of the back electron bombardment of the RF gun can be optimized and decreased by means of experimental research. Further more, higher quality beam can be obtained. The updated results about the power test on the thermionic cathode RF gun is introduced in this paper. A beam intensity about 400 mA is measured by beam-current transformer at the exit of the RF gun. And the effect is studied that back electron bombardment could be changed with adjustment of phase and amplitude of the electric field in the first cavity. The test results and phenomenon agree well with the theoretical design ones.
- independently tunable cells,
- thermionic cathode,
- RF gun,
- experimental research

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