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TY - CONF AU - Shao, J.H. AU - Doran, D.S. AU - Jing, C.-J. AU - Kuzikov, S.V. AU - Liu, W. AU - Lu, X. AU - Piot, P. AU - Power, J.G. AU - Tan, W.H. AU - Whiteford, C. AU - Wisniewski, E.E. ED - Liu, Lin ED - Byrd, John M. ED - Neuenschwander, Regis T. ED - Picoreti, Renan ED - Schaa, Volker R. W. TI - High-Power Test of a Highly Over-Coupled X-Band RF Gun Driven by Short RF Pulses J2 - Proc. of IPAC2021, Campinas, SP, Brazil, 24-28 May 2021 CY - Campinas, SP, Brazil T2 - International Particle Accelerator Conference T3 - 12 LA - english AB - Beam brightness, a key figure of merit of RF photocathode guns, can be improved by increasing the cathode surface field which suppresses emittance growth from space charge. The surface field in normal-conducting structures is mainly limited by RF breakdown and it has been experimentally discovered that RF breakdown rate exponentially depends on RF pulse length. A highly over-coupled 1.5-cell X-band photocathode gun has been developed to be powered by 9 ns RF pulses with 3 ns rising time, 3 ns flat-top, and 3 ns falling time generated by an X-band metallic power extractor. In the recent experiment at Argonne Wakefield Accelerator facility, cathode surface field up to ~350 MV/m with a low breakdown rate has been obtained under ~250 MW input power. Strong beam loading from dark current was observed during RF conditioning and quickly recovered to a negligible level after the gun reached the maximum gradient. Detailed high-power test results and data analysis will be reported in this manuscript. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4432 EP - 4434 KW - gun KW - cathode KW - electron KW - wakefield KW - flattop DA - 2021/08 PY - 2021 SN - 2673-5490 SN - 978-3-95450-214-1 DO - doi:10.18429/JACoW-IPAC2021-THPAB331 UR - https://jacow.org/ipac2021/papers/thpab331.pdf ER -