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TY - CONF AU - Dohmae, T. AU - Inoue, H. AU - Kubo, T. AU - Shimizu, H. AU - Umemori, K. AU - Watanabe, Y. AU - Yamanaka, M. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Investigation on 1, 3 and 9-Cell SRF Elliptical Cavities made of Large Grain Niobium 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 - Large grain (LG) niobium is directly sliced from niobium ingot. LG niobium sheet has larger crystal size than that of fine grain (FG) niobium which is forged and rolled, and normally used as the SRF cavity materials. It is expected that higher Q-value can be achieved using LG niobium sheet. And, effective reduction in material cost can be also achieved by LG niobium since forge and rolling process are skipped. On the other hand, there are some difficulties in fabrication since it has large deformation due to strong anisotropy. Cavity fabrication facility in KEK has been fabricated 1, 3 and 9-cell elliptical cavities made by LG niobium and RF tested in vertical cryostat. In this talk, the fabrication process and test results from these cavities will be presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1213 EP - 1215 KW - cavity KW - SRF KW - niobium KW - cryomodule KW - radio-frequency DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-FRCAA6 UR - http://jacow.org/srf2019/papers/frcaa6.pdf ER -