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TY - CONF AU - Park, S.J. AU - Han, H.S. AU - Hwang, J.H. AU - Hwang, W.H. AU - Hyun, S.Y. AU - Jang, S.D. AU - Jang, S.S. AU - Joo, Y.D. AU - Kim, K.R. AU - Park, C.D. AU - Park, Y.J. AU - Seo, H.S. AU - Yu, D.H. ED - Schaa, Volker RW ED - Arduini, Gianluigi ED - Pranke, Juliana ED - Seidel, Mike ED - Lindroos, Mats TI - Status of High-Efficiency Klystron Development for the PLS-II and PAL-XFEL J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017 C1 - Copenhagen, Denmark T2 - International Particle Accelerator Conference T3 - 8 LA - english AB - We are developing a high-efficiency klystron for use in the PLS-II(Pohang Light Source II) and the PAL-XFEL in the Pohang Accelerator Laboratory. Since the PLS-II and the PAL-XFEL are already running with ~70 klystron modulator systems, newly developed klystrons should be designed to fit into existing installation spaces and power supplies, and their overall lengths(< 2 m) and beam perveances(2 upervs) should not be changed. In order to achieve the high efficiency with aforementioned boundary conditions, we are going to adopt a multi-cell output cavity in which, unlike those of the the SLAC X-band and KEK C-band klystrons, the cell frequencies are independently tuned to provide maximum beam-to-rf power conversion. In this article we report on our physics and engineering design efforts to achieve the high efficiency with minimum instabilities. PB - JACoW CP - Geneva, Switzerland SP - 4726 EP - 4729 KW - klystron KW - electron KW - cavity KW - gun KW - cathode DA - 2017/05 PY - 2017 SN - 978-3-95450-182-3 DO - 10.18429/JACoW-IPAC2017-THPVA114 UR - http://jacow.org/ipac2017/papers/thpva114.pdf ER -