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TY - CONF AU - Chen, J.F. AU - Bertucci, M. AU - Bosotti, A. AU - Eshraqi, M. AU - Lindroos, M. AU - Michelato, P. AU - Monaco, L. AU - Pagani, C. AU - Paparella, R. AU - Pirani, S. AU - Sertore, D. AU - Åkesson, T.P.Å. ED - Schaa, Volker RW ED - He, Yuan ED - Li, Lu ED - Zhao, Ning TI - Passband Modes Excitation Triggered by Field Emission in ESS Medium Beta Cavity Prototype J2 - Proc. of SRF2017, Lanzhou, China, July 17-21, 2017 C1 - Lanzhou, China T2 - International Conference on RF Superconductivity T3 - 18 LA - english AB - During the first vertical test of ESS Medium Beta large-grain prototype cavity in INFN-LASA, a phenomenon of coexisting two passband-modes was observed – 4π/6 mode was excited spontaneously during the power rise of 3π/6 mode. This phenomenon is most likely due to the field-emission electrons that transfer their energy gained from the 3π/6 mode to the 4π/6 mode. In this paper, we present the experimental results, the excitation mechanism and the related simulation results. PB - JACoW CP - Geneva, Switzerland SP - 489 EP - 493 KW - ion KW - cavity KW - site KW - electron KW - simulation DA - 2018/01 PY - 2018 SN - 978-3-95450-191-5 DO - 10.18429/JACoW-SRF2017-TUPB047 UR - http://jacow.org/srf2017/papers/tupb047.pdf ER -