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Title	STF-2 Cryomodule Performance and New Input Coupler R&D; for ILC
Author(s)	Yamamoto, Yasuchika (KEK, Tsukuba) ; Honma, Teruya (KEK, Tsukuba) ; Kako, Eiji (KEK, Tsukuba) ; Kojima, Yuuji (KEK, Tsukuba) ; Matsumoto, Toshihiro (KEK, Tsukuba) ; Michizono, Shinichiro (KEK, Tsukuba) ; Nakai, Hirotaka (KEK, Tsukuba) ; Shishido, Toshio (KEK, Tsukuba) ; Yamamoto, Akira (KEK, Tsukuba) ; Julie, Charles (CERN) ; Montesinos, Eric (CERN)
Publication	SISSA, 2016
Number of pages	6
In:	PoS ICHEP2016 (2016) 066
In:	38th International Conference on High Energy Physics, Chicago, IL, USA, 03 - 10 Aug 2016, pp.066
DOI	10.22323/1.282.0066
Subject category	Accelerators and Storage Rings
Abstract	The high power test for STF -2 cryomodule with twelve cavities has completed successfully in 2015. It became clear the average accelerating gradient was 30.3 MV/m, eight cavities achi eved above 31.5 MV/m as the ILC specification, and three cavities had the significant performance degradation by heavy field emission due to the additional clean room work in t he STF tunnel. As the following next steps, there are the LFD (Lorenz Force Detuning) measurem ent, LFD compensation by piezo, and long ru n for check of stable operation at high gradient. In th e long run around 32 MV/m, each cavity without degradation showed the stable operation with the successful LFD compensation by piezo and RF feedback system. On the other hand, from the view point of pl ug-compatibility for the input coupler in the ILC, new STF input couplers with 40mm of input port were re -designed, fabricated and high -power -tested successfully. Moreover, for the lower cost study, another input couplers with coating -free ceramic will be also tested soon in the collaboration of CERN and KEK. In this presentation, the detailed results for STF -2 Cryomodule t est and 40mm input couplers are reported.
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