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TY - CONF AU - Yamamoto, Y. AU - Irikura, M. AU - Ishibashi, M. AU - Julie, C. AU - Kako, E. AU - Matsumoto, T. AU - Michizono, S. AU - Montesinos, E. AU - Yamamoto, A. AU - Yasutake, H. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Availability of the TiN Coating-Free Ceramic in the STF-type Power Coupler for ILC J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - In the Superconducting RF Test Facility (STF) in KEK, the research and development for the power coupler with the TiN coating-free ceramic has been done from 2014. In 2016, the high power test at the test bench was stopped due to the worse vacuum level by the unusual heating around the RF window with the TiN coating-free ceramic and the coaxial tapered section, which was caused by the enormous emission of the secondary electrons from the ceramic. And, the situation was never also changed by the ultrapure water rinsing for the power couplers several times. However, in 2017, the ultrasonic rinsing was done for the power couplers for the first time by the collaboration between KEK and TETD. After that, the situation was drastically improved, and the secondary electron emission almost disappeared even in the higher RF duty. This shows that the TiN coating-free ceramic is the prospective item for the cost reduction in ILC. In this report, the recent result for the power coupler with the TiN coating-free ceramic will be presented in detailed. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2819 EP - 2821 KW - electron KW - SRF KW - vacuum KW - cryomodule KW - GUI DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-WEPML053 UR - http://jacow.org/ipac2018/papers/wepml053.pdf ER -