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TY - UNPB AU - Martinello, M. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Microscopic Investigation of Flux Trapping Sites in Bulk Nb 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 - Flux expulsion efficiency of SRF cavities is strictly dependent on the properties of the material used for cavity fabrication. Some cavities improve their flux expulsion properties after being heath treated at high temperature (usually larger than 900°C), suggesting that flux trapping sites are intimately related to the material microstructure. In this presentation, results of a detailed microstructure analysis that aims to unavailing which features are culprit of pinning flux in bulk niobium cavities, will be presented. PB - JACoW Publishing CP - Geneva, Switzerland ER -