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TY - CONF AU - Yamanaka, M. AU - Dohmae, T. AU - Hocker, A. AU - Inoue, H. AU - Park, G.-T. AU - Tajima, T. AU - Umemori, K. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Hydroforming SRF Three-cell Cavity from Seamless Niobium Tube J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - We are developing the manufacturing method for superconducting radio frequency (SRF) cavities by using a hydroforming instead of using conventional electron beam welding. We expect higher reliability and reduced cost with hydroforming. For successful hydroforming, high-purity seamless niobium tubes with good formability as well as advancing the hydroforming technique are necessary. Using a seamless niobium tube from ATI Wah Chang, we were able to successfully hydroform a 1.3 GHz three-cell TESLA-like cavity and obtained an Eacc of 32 MV/m. A barrel polishing process was omitted after the hydroforming. The vertical test was carried out with very rough inside surface. We got amazing and interesting result. PB - JACoW CP - Geneva, Switzerland SP - 2170 EP - 2173 KW - cavity KW - niobium KW - accelerating-gradient KW - SRF KW - superconductivity DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-WEPMB023 UR - http://jacow.org/ipac2016/papers/wepmb023.pdf ER -