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Practical realization of a self-adaptive feed-forward control system for RF gun beam-loading compensation
Li FT(李逢天); Xie JL(谢家麟); Li, FT; Xie, JL
刊名NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
1998
卷号407期号:1-3页码:332-337
关键词control RF gun beam-loading amplitude phase
学科分类Instruments & Instrumentation; Nuclear Science & Technology; Physics; Spectroscopy
DOI10.1016/S0168-9002(98)00045-X
通讯作者Chinese Acad Sci, Inst High Energy Phys, Beijing 100080, Peoples R China
文章类型Article; Proceedings Paper
英文摘要Beijing Free Electron Laser Facility (BFEL) features the adoption of a thermionic cathode microwave electron gun which is a compact RF linac-based FEL injector with good performance for IR spectral region. For long macro-pulse operation, however, the back-bombardment of the electrons on the gun cathode causes current increasing and hence energy decreasing of the output electron beam due to beam-loading effect. This effect degrades FEL performance because the energy spread of the accelerated beam will be seriously enhanced. In this paper, the experimental evidence of the beam-loading effect is first presented. Then, the analytical procedures for the calculation of the control signals will be briefly discussed that form the basis of the computer programming. The system has the capability to control both the amplitude and the phase of the RF output from the klystron so as to deal with the coupling between the circuit elements for amplitude and phase control. Some difficulties in implementation are also discussed and some practical realization measures are presented accordingly. The control system described above is operational and some preliminary experimental results have been obtained, including the control of amplitude and phase fluctuations of the RF output of the klystron and the microwave held in the gun cavity. These preliminary outcomes suggest that the system developed is effective to improve the beam quality and hence the performance of BFEL. (C) 1998 Elsevier Science B.V. All rights reserved.
类目[WOS]Instruments & Instrumentation ; Nuclear Science & Technology ; Physics, Particles & Fields ; Spectroscopy
研究领域[WOS]Instruments & Instrumentation ; Nuclear Science & Technology ; Physics ; Spectroscopy
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语种英语
WOS记录号WOS:000074395200066
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被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/237023
专题院士_期刊论文
作者单位中国科学院高能物理研究所
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GB/T 7714
Li FT,Xie JL,Li, FT,et al. Practical realization of a self-adaptive feed-forward control system for RF gun beam-loading compensation[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,1998,407(1-3):332-337.
APA 李逢天,谢家麟,Li, FT,&Xie, JL.(1998).Practical realization of a self-adaptive feed-forward control system for RF gun beam-loading compensation.NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,407(1-3),332-337.
MLA 李逢天,et al."Practical realization of a self-adaptive feed-forward control system for RF gun beam-loading compensation".NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 407.1-3(1998):332-337.
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