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TY - CONF AU - Koufalis, P.N. AU - Ge, M. AU - Liepe, M. AU - Maniscalco, J.T. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Effect of Low Temperature Infusion Heat Treatments and "2/0" Doping on Superconducting Cavity 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 - Under specific circumstances, low temperature infusion heat treatments of niobium cavities have resulted in the ubiquitous "Q-rise". This is an increase in quality factor with increasing field strength or equivalently a decrease in the temperature-dependent component of the surface resistance. We investigate the results of various infusion conditions with infusion bake time as a free parameter. To study the very near surface effects of infusion, we employ HF rinsing, light VEP, and oxypolishing to remove several or tens of nm at a time. We present results from RF performance tests of low temperature infusion heat treated niobium cavities, and correlate these with SIMS impurity depth profiles obtained from witness samples. We also present results of a cavity doped at 800 C with the "2/0" recipe. PB - JACoW Publishing CP - Geneva, Switzerland SP - 118 EP - 122 KW - cavity KW - ECR KW - niobium KW - SRF KW - background DA - 2019/08 PY - 2019 SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-MOP032 UR - http://jacow.org/srf2019/papers/mop032.pdf ER -