Numerical study and test of the APS linac transverse deflecting cavity | |
Hui, D.1,2,3; Sun, Y.1; Smith, T.1; Luo, D.1,2,3; Yao, C-Y1; Tian, J.1 | |
刊名 | NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT |
2019-04-11 | |
卷号 | 923页码:118-126 |
关键词 | Traveling wave deflecting cavity Coupler Global reflection coefficient Field flatness |
ISSN号 | 0168-9002;1872-9576 |
DOI | 10.1016/j.nima.2019.01.043 |
产权排序 | 1 |
英文摘要 | The transverse deflecting cavity can be used to transform particle distributions in the 6D phase space, which makes it a promising component in phase space beam diagnostics and beam manipulations. In the Advanced Photon Source (APS) Linac, a LOLA-type traveling wave deflecting cavity was installed for the diagnostics of beam characteristics, such as the bunch length, bunch temporal profile, time-dependent energy spread and slice (time-correlated) transverse emittance. In this paper, this deflecting cavity is modeled and analyzed with the numerical method. The effects of the center cell and coupler cell dimensions on the performance of the whole structure are studied, which shows the coupler cell radius has a dominant effect over the coupler cell length and slot width on the global reflection coefficient and field flatness. Important RF parameters, such as S-11, field flatness and phase advance etc., of the LOLA-II cavity in tuning are calculated and discussed. After optimization, the field flatness of the cavity is 2.1%, the phase advance is 119.66 degrees degrees with a standard deviation smaller than 0.5 degrees and the bandwidth is 15.738 MHz when VSWR < 1.1 (i.e. the S-11, < -26 dB). Bead-pull measurements and RF conditioning have been also performed and discussed. Finally, the initial cavity commissioning with electron beam of 375 MeV is reported, and compared with simulation. |
语种 | 英语 |
出版者 | ELSEVIER SCIENCE BV |
WOS记录号 | WOS:000459034800018 |
内容类型 | 期刊论文 |
源URL | [http://ir.opt.ac.cn/handle/181661/31160] |
专题 | 条纹相机工程中心 |
通讯作者 | Hui, D. |
作者单位 | 1.Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA 2.Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Shaanxi, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Hui, D.,Sun, Y.,Smith, T.,et al. Numerical study and test of the APS linac transverse deflecting cavity[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,2019,923:118-126. |
APA | Hui, D.,Sun, Y.,Smith, T.,Luo, D.,Yao, C-Y,&Tian, J..(2019).Numerical study and test of the APS linac transverse deflecting cavity.NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,923,118-126. |
MLA | Hui, D.,et al."Numerical study and test of the APS linac transverse deflecting cavity".NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 923(2019):118-126. |
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