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TY - CONF AU - Posen, S. AU - Lee, J. AU - Melnychuk, O.S. AU - Pischalnikov, Y.M. AU - Seidman, D.N. AU - Sergatskov, D.A. AU - Tennis, B. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Nb₃Sn at Fermilab: Exploring Performance 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 - Fermilab’s Nb₃Sn coating program produced its first 1.3 GHz single cell cavities in early 2017 and since then has explored the performance of Nb₃Sn on a wide variety of cavity substrates and performed microscopic studies down to atomic resolution. Results to present in this talk include a study of frequency dependence from 650 MHz to 1.3 GHz of BCS resistance, residual resistance, and magnetic flux sensitivity. We show microscopic studies performed in collaboration with Northwestern University’s Materials Science and Engineering Department of limitation mechanisms in Nb₃Sn, including thin film regions and tin segregation at grain boundaries, discussing correlations with RF performance and mechanisms for the formation of these features during growth. Finally, we present results of the first 1.3 GHz 9-cell cavity coated with Nb₃Sn. PB - JACoW Publishing CP - Geneva, Switzerland SP - 818 EP - 822 KW - cavity KW - SRF KW - multipactoring KW - niobium KW - superconductivity DA - 2019/08 PY - 2019 SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-THFUB1 UR - http://jacow.org/srf2019/papers/thfub1.pdf ER -