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TY - CONF AU - Ciovati, G. AU - Gurevich, A.V. AU - Parajuli, I.P. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Maximum Performance of Cavities Affected by the High-field Q-slope (HFQS) 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 - The performance of high-purity, bulk niobium SRF cavities treated by chemical processes such as BCP or EP is limited by the so-called high-field Q-slope (HFQS). Several models and experimental studies have been proposed and performed over the years to understand the origin of these anomalous losses but a general consensus on what these orgins are is yet to be established. In this contribution, we present the results from the RF tests of several 1.3 GHz single-cell cavities limited by the HFQS and tested using a variable input coupler. This allowed to maintain close to critical coupling even at high field and the data showed that the HFQS did not saturate and that in some cases a power dissipation of up to 200 W at 2 K could be sustained without quench. PB - JACoW Publishing CP - Geneva, Switzerland SP - 533 EP - 537 KW - cavity KW - SRF KW - experiment KW - niobium KW - radio-frequency DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-TUP049 UR - http://jacow.org/srf2019/papers/tup049.pdf ER -