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TY - CPAPER AU - Gheidi, S. AU - Buck, T.J. AU - Dehn, M. AU - Junginger, T. AU - Kiefl, R. AU - Laxdal, R.E. AU - Morris, G. TI - Muon Spin Rotation on Treated Nb Samples in Parallel Field Geometry J2 - Proc. of International Conference on RF Superconductivity (SRF2015), Whistler, BC, Canada, Sept. 13-18, 2015 AB - MuSR is a powerful tool to probe local magnetism and hence can be used to diagnose the entry of magnetic flux in superconductors. First measurements on SRF samples were done with an external DC field applied perpendicular to the sample1 (transverse geometry) with the muons applied to the sample face. Here the results are strongly impacted by demagnetization, pinning strength and edge effects. A new spectrometer has been developed to allow sample testing with a field varying from 0 to 300mT applied along the sample face (parallel geometry) analogous to rf fields in SRF resonators. The geometry is characterized by a small demagnetization factor reducing the impact of pinning and edge effects on field of first flux entry. The beamline installation and first results comparing transverse and parallel results will be presented. PB - JACoW CY - Geneva, Switzerland SP - 210 EP - 213 KW - cavity KW - SRF KW - polarization KW - detector KW - niobium DA - 2015/12 PY - 2015 SN - 978-3-95450-178-6 DO - 10.18429/JACoW-SRF2015-MOPB051 UR - http://srf2015.vrws.de/papers/mopb051.pdf ER -