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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
Department精密物理量测量实验室
2019-04-11
Source PublicationNUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ISSN0168-9002;1872-9576
Volume923Pages:118-126
Contribution Rank1
Abstract

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.

KeywordTraveling wave deflecting cavity Coupler Global reflection coefficient Field flatness
DOI10.1016/j.nima.2019.01.043
Indexed BySCI ; EI
Language英语
WOS IDWOS:000459034800018
PublisherELSEVIER SCIENCE BV
EI Accession Number20190606474785
Citation statistics
Document Type期刊论文
Identifierhttp://ir.opt.ac.cn/handle/181661/31160
Collection精密物理量测量实验室
Corresponding AuthorHui, D.
Affiliation1.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
Recommended Citation
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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