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TY - CONF AU - Tanaka, T. AU - Fukuda, M.K. AU - Inagaki, M. AU - Nagashima, R. AU - Nakao, K. AU - Nogami, K. AU - Sakai, T. AU - Satoh, D. AU - Takatomi, T. AU - Takatsuka, K. AU - Terunuma, N. AU - Urakawa, J. AU - Yoshida, M. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Cold Model Cavity for 20-K Cryocooled C-band Photocathode RF Gun J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - A cryocooled 2.6-cell C-band photocathode RF gun is under development at Nihon University in collaboration with KEK. The RF characteristics of a pillbox-type 2.6-cell C-band RF cavity at 20 K were in agreement with the theoretical predictions. The result of the cold test for a cavity with the input coupler confirmed the same characteristics. Based on these results a refined cold model of the 20-K cryocooled photocathode RF gun has been designed using SUPERFISH and CST-STUDIO. The separation between the TM01 pi and the TM01 half-pi modes has been increased from 20 MHz to 52 MHz by extending the diameter of the cavity iris and reducing the disk thickness. The 2.6-cell structure has been modified from pillbox to ellipsoid-like type. The end-plate of the 0.6-cell cavity has a center hole for bead-pull measurements of the on-axis electric filed through the entire structure. Mounting of a photocathode assembly in the end-plate has not been considered, since the purpose is solely to measure the low-power and low-temperature RF characteristics. A new design for the input coupler has been employed. The cavity will be completed early in 2016. PB - JACoW CP - Geneva, Switzerland SP - 2635 EP - 2637 KW - simulation KW - cavity KW - gun KW - coupling KW - impedance DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-WEPMY037 UR - http://jacow.org/ipac2016/papers/wepmy037.pdf ER -