High gradients at SRF photoinjector cavities with low RRR copper cathode plug screwed to the cavity back wall

Vogel, Elmar; Wiencek, M.; van der Horst, B.; Sägebarth, S.; Muhs, A.; Reschke, D.; Klinke, D.; Weise, H.; Bazyl, D.; Schmökel, M.; Sekutowicz, J.; Schilling, Patrick; Büttner, T.; Iversen, J.; Thie, J.-H.; Steder, L.

Preprint

PUBDB-2023-06113

High gradients at SRF photoinjector cavities with low RRR copper cathode plug screwed to the cavity back wall

Vogel, E. (Corresponding author)DESY* ; Sekutowicz, J.DESY* ; Bazyl, D.DESY* ; Büttner, T.DESY* ; van der Horst, B. ; Iversen, J.DESY* ; Klinke, D.DESY* ; Muhs, A.DESY* ; Reschke, D.DESY* ; Sägebarth, S.DESY* ; Schilling, P.DESY* ; Schmökel, M.DESY* ; Steder, L.DESY* ; Thie, J.-H.DESY* ; Weise, H.DESY* ; Wiencek, M.DESY*

2023

[10.3204/PUBDB-2023-06113]

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Report No.: arXiv:2310.02974

Abstract: In recent years we increased the typical maximum peak field on axis gradients obtained in L-band superconducting RF (SRF) photoinjector cavities at vertical tests to around 55 MV/m. This was achieved with niobium cathode plugs directly screwed to the cavity back wall omitting an RF choke filter and a load lock system for cathodes. Copper demonstrated being a suitable cathode material in normal conducting injector cavities used at X-Ray Free Electron Lasers (XFELs) operating with pulsed RF. In this article we present the first experimental confirmation that peak field on axis gradients around 55 MV/m and beyond can be achieved in L-band SRF photoinjector cavities with copper cathode plugs screwed to the cavity back wall. We view this as a major milestone for the development of a high gradient photoinjector operating continuous wave (CW).

Note: 4 pages, 7 figures, to be submitted to PRAB

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