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TY - CONF AU - Umemori, K. AU - Kako, E. AU - Konomi, T. AU - Michizono, S. AU - Okada, T. AU - Sakai, H. AU - Tamura, J. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Study on Nitrogen Infusion using KEK New Furnace J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019 CY - Dresden, Germany T2 - International Conference on RF Superconductivity T3 - 19 LA - english AB - KEK has been carried out high-Q/high-G R&D, to realize high performance of SRF cavities toward ILC. KEK constructed a new furnace, which is dedicated for N-infusion studies. We performed more than 10 times of N-infusion trials using 1.3 GHz single-cell cavities. Some results showed better Q-values up to high field, however, some results showed degraded Q-E slopes probably due to contamination. Improvement of accelerating gradient is not observed at moment. We have tried to clean the furnace and Nitrogen injection line to reduce the effect of contamination. Details of procedures of N-infusion, results of vertical tests, condition of the furnace including RGA spectrum and Nb sample analysis results are shown. PB - JACoW Publishing CP - Geneva, Switzerland SP - 95 EP - 98 KW - cavity KW - injection KW - SRF KW - accelerating-gradient KW - vacuum DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-MOP027 UR - http://jacow.org/srf2019/papers/mop027.pdf ER -