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TY - UNPB AU - Checchin, M. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - New Insights into RF Field Amplitude and Frequency Dependence of Vortex Surface Resistance 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 - In this talk, the surface resistance due to trapped vortices is being described. Experimental data acquired at Fermilab for bulk niobium elliptical cavities as a function of frequency, trapped magnetic field value and RF field amplitude will be presented. Numerical calculations of the vortex dynamics under RF drive will be also presented in order to describe the mechanism underneath the RF field amplitude dependence of the surface resistance due to trapped vortices. Different pinning landscapes in the material will be taken into consideration, aiming to pinpoint the pinning configuration that better describes the observed field dependence. PB - JACoW Publishing CP - Geneva, Switzerland ER -