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TY - UNPB AU - Porter, R.D. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Field Limitation in Nb₃Sn Cavities 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 - Niobium-3 Tin (Nb₃Sn) is the most promising alternative material to Nb for SRF cavities, allowing for twice the operating temperature and potentially twice the accelerating gradient compared to Nb. According to the superheating field, an elliptical Nb₃Sn cavity could reach 96 MV/m. However, current Cornell Nb₃Sn cavities quench between 14 and 18 MV/m in CW operation. Previous work has shown that cavity quench occurs at a thermal surface defect, but the details of the defect are not yet understood. Here we present further studies of the defect/quench mechanism conducted at Cornell and with collaborators. These studies suggest new quench mechanisms and rule out older hypotheses. PB - JACoW Publishing CP - Geneva, Switzerland ER -