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TY - CONF AU - Posen, S. AU - Hall, D.L. AU - Liepe, M. AU - Proslier, Th. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - High Q0 at Medium Fields in Nb3Sn SRF Cavities at 4.2 K J2 - Proc. of IPAC2015, Richmond, VA, USA, May 3-8, 2015 C1 - Richmond, VA, USA T2 - International Particle Accelerator Conference T3 - 6 LA - english AB - Nb3Sn has proven itself to be a very promising alternative SRF material. With twice the critical temperature of niobium cavities, 1.3 GHz Nb3Sn cavities can achieve quality factors on the order of 10¹⁰ even at 4.2 K, significantly reducing cryogenic infrastructure and operational costs. In addition, its large predicted superheating field may allow for maximum accelerating gradients up to twice that of niobium for high energy applications. In this work, we report on new cavity results from the Cornell Nb3Sn SRF program demonstrating a significant improvement in the maximum field achieved with high Q0 in a Nb3Sn cavity. At 4.2 K, accelerating gradients above 16 MV/m were obtained with Q0 of 8x10⁹, showing the potential of this material for future applications. In addition to this result, current limitations are discussed. PB - JACoW CP - Geneva, Switzerland SP - 3467 EP - 3470 KW - cavity KW - niobium KW - cryogenics KW - SRF KW - operation DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-WEPTY078 UR - http://jacow.org/ipac2015/papers/wepty078.pdf ER -