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TY - CONF AU - Zuboraj, M.R.A. AU - Baryshev, S.V. AU - Dolgashev, V.A. AU - Fleming, R.L. AU - Gorelov, V. AU - Jevarjian, E. AU - Lewellen, J.W. AU - Middendorf, M.E. AU - Nanni, E.A. AU - Schneider, M.E. AU - Simakov, E.I. AU - Snively, E.J.C. AU - Tantawi, S.G. ED - Zimmermann, Frank ED - Tanaka, Hitoshi ED - Sudmuang, Porntip ED - Klysubun, Prapong ED - Sunwong, Prapaiwan ED - Chanwattana, Thakonwat ED - Petit-Jean-Genaz, Christine ED - Schaa, Volker R.W. TI - High Gradient Conditioning and Performance of C-Band ß=0.5 Proton Normal- Conducting Copper and Copper-Silver Radio-Frequency Accelerating Cavities J2 - Proc. of IPAC2022, Bangkok, Thailand, 12-17 June 2022 CY - Bangkok, Thailand T2 - International Particle Accelerator Conference T3 - 13 LA - english AB - This work presents the results of high gradient testing of the two C-band (5.712 GHz) normal conducting ß=0.5 accelerating cavities. The first cavity was made of copper and second was made of copper-silver alloy with 0.08% silver concentration. The tests were conducted at the C-Band Engineering Research Facility of New Mexico (CERF-NM) located at Los Alamos National Laboratory Both cavities achieved gradients in excess of 200 MV/m and surface electric fields in excess of 300 MV/m. The breakdown rates were mapped as functions of the gradient and peak surface fields. The gradients and peak surface fields observed in the copper-silver cavity were about 20% higher than those in the pure copper cavity with the same breakdown rate. It was concluded that the dominant breakdown mechanism in these cavities was not the pulse heating but the breakdown due to very high surface electric fields. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1567 EP - 1569 KW - cavity KW - proton KW - operation KW - klystron KW - coupling DA - 2022/07 PY - 2022 SN - 2673-5490 SN - 978-3-95450-227-1 DO - doi:10.18429/JACoW-IPAC2022-TUPOMS060 UR - https://jacow.org/ipac2022/papers/tupoms060.pdf ER -