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TY - CONF AU - Umemori, K. AU - Hara, H. AU - Inoue, H. AU - Kako, E. AU - Konomi, T. AU - Kubo, T. AU - Sakai, H. AU - Sennyu, K. AU - Shimizu, H. AU - Yamanaka, M. AU - Yanagisawa, T. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Vertical Test Results of Nitrogen Doped SRF Cavities 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 - Recently Nitrogen doping(N-doping) technique was proposed and drastic improvements of Q-values were reported. Since high-Q operation of SRF cavities are very attractive for CW machine, we started investigation on performance of Nitrogen doped SRF cavities. Nitrogen doping systems were prepared on two vacuum furnaces, which have been used for annealing of SRF cavities. Two fine grain single cell cavities have been used for the study. After 800 degree, 3 hours annealing, N-doping were carried out under several Pa of Nitrogen pressure and followed by post annealing. Three kind of different conditions, pressure and duration time, were attempted. After applying EP-2, cavity performances were evaluated by vertical tests. Against our expectations, we observed lower Q-values, at every measurements, than those measured without N-doping. In this presentation, we describe details about N-doping system and parameters and results obtained by vertical tests. Some discussions are also given against our results. PB - JACoW CP - Geneva, Switzerland SP - 2154 EP - 2157 KW - cavity KW - vacuum KW - SRF KW - monitoring KW - operation DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-WEPMB016 UR - http://jacow.org/ipac2016/papers/wepmb016.pdf ER -