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RIS citation export for WEPMB017: High Gradient Cavity Performance in STF-2 Cryomodule for the ILC at KEK

AU - Yamamoto, Y.
AU - Honma, T.
AU - Kako, E.
AU - Kojima, Y.
AU - Matsumoto, T.
AU - Nakai, H.
AU - Shishido, T.
ED - Petit-Jean-Genaz, Christine
ED - Kim, Dong Eon
ED - Kim, Kyung Sook
ED - Ko, In Soo
ED - Schaa, Volker RW
TI - High Gradient Cavity Performance in STF-2 Cryomodule for the ILC at KEK
J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016
C1 - Busan, Korea
T2 - International Particle Accelerator Conference
T3 - 7
LA - english
AB - The high power test for STF-2 cryomodule has completed successfully in 2015. Before cooldown of cryomodule, at first, the input coupler conditioning at room temperature is done with detuned cavities. After cooldown, the cavity conditioning, which is the main part in the performance test, is done by monitoring the radiation level measured at three locations around the cryomodule, and the heating and RF output at two HOM (Higher Order Mode) couplers. Consequently, it became clear the average accelerating gradient is 30 MV/m for STF-2 cryomodule (39 MV/m at max. and 15 MV/m at min.), and the second cavity string with four cavities had the significant performance degradation by heavy field emission due to the additional clean room work in the STF tunnel. As the following next steps, there are the LFD (Lorenz Force Detuning) measurement, LFD compensation by piezo, and long run for check of stable operation at high gradient. In the 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. In this paper, the detailed test result will be presented.
CP - Geneva, Switzerland
SP - 2158
EP - 2160
KW - cavity
KW - cryomodule
KW - radiation
KW - accelerating-gradient
DA - 2016/06
PY - 2016
SN - 978-3-95450-147-2
DO - 10.18429/JACoW-IPAC2016-WEPMB017
UR - http://jacow.org/ipac2016/papers/wepmb017.pdf
ER -