H. Jia, T. Li, T. Wang, Y. Zhao, X. Zhang, H. Xu, Z. Liu, J. Liu, L. Lin, H. Xie, L. Feng, F. Wang, F. Zhu, J. Hao, S. Quan, K. Liu, S. Huang
{"title":"High Performance Operation of a Direct-Current and Superconducting Radio-Frequency Combined Photocathode Gun","authors":"H. Jia, T. Li, T. Wang, Y. Zhao, X. Zhang, H. Xu, Z. Liu, J. Liu, L. Lin, H. Xie, L. Feng, F. Wang, F. Zhu, J. Hao, S. Quan, K. Liu, S. Huang","doi":"arxiv-2406.00659","DOIUrl":null,"url":null,"abstract":"Superconducting radio-frequency (SRF) guns are promising candidates to\ndeliver high brightness continuous-wave (CW) electron beams for new generations\nof coherent linac light sources, ultrafast electron diffractions, MeV pulsed\nbeam applications, etc. To solve the compatibility problem of semiconductor\nphotocathodes, a hybrid gun combining a direct-current gap and an SRF cavity\nhas been developed. The gun, employing K2CsSb photocathodes driven by a green\nlaser, has been brought into stable CW operation with a dark current below 100\npA, delivering electron beams at an energy gain of 2.4 MeV, an electron bunch\ncharge of 100 pC, and a repetition rate of 1 MHz. A normalized beam emittance\nof 0.54 mm-mrad has been achieved at the bunch charge of 100 pC and peak\ncurrent of about 6 A. CW operation at 81.25 MHz repetition rate has also been\ntested with the maximum average beam current reaching 3 mA.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"43 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - PHYS - Accelerator Physics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2406.00659","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Superconducting radio-frequency (SRF) guns are promising candidates to
deliver high brightness continuous-wave (CW) electron beams for new generations
of coherent linac light sources, ultrafast electron diffractions, MeV pulsed
beam applications, etc. To solve the compatibility problem of semiconductor
photocathodes, a hybrid gun combining a direct-current gap and an SRF cavity
has been developed. The gun, employing K2CsSb photocathodes driven by a green
laser, has been brought into stable CW operation with a dark current below 100
pA, delivering electron beams at an energy gain of 2.4 MeV, an electron bunch
charge of 100 pC, and a repetition rate of 1 MHz. A normalized beam emittance
of 0.54 mm-mrad has been achieved at the bunch charge of 100 pC and peak
current of about 6 A. CW operation at 81.25 MHz repetition rate has also been
tested with the maximum average beam current reaching 3 mA.
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