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TY - CONF AU - Wenskat, M. AU - Bate, C. AU - Jeromin, A. AU - Keller, T.F. AU - Knobloch, J. AU - Kramer, F. AU - Kugeler, O. AU - Köszegi, J.M. AU - Reschke, D. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Cavity Cut-out Studies of a 1.3 GHz Single-cell Cavity After a Failed Nitrogen Infusion Process 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 - R&D on the nitrogen infusion process at DESY produced at the beginning a series of 1.3 GHz single-cell cavities which have shown severe deterioration in the vertical cold test which was completely unexpected and could not be explained. To investigate the reason for the deterioration, one of those cavities was optically inspected and a T- and H-Map test was done in collaboration with HZB. Together with 2nd Sound data, regions of interests were identified and cut from the cavity. Subsequent surface analysis techniques (SEM/EDX, SIMS, PIXE, EBSD, DB-PAS, PALS, XPS) were applied in order to identify the reason for the deterioration. Especially the differences between hot and cold spots as well as quench spots identified by T-Mapping were investigated. PB - JACoW Publishing CP - Geneva, Switzerland SP - 87 EP - 89 KW - cavity KW - niobium KW - SRF KW - electron KW - superconductivity DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-MOP025 UR - http://jacow.org/srf2019/papers/mop025.pdf ER -