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DOI:10.18429/JACoW-SRF2015-MOPB051
Title Muon Spin Rotation on Treated Nb Samples in Parallel Field Geometry
Authors
  • S. Gheidi
    UBC, Vancouver, B.C., Canada
  • T.J. Buck, T. Junginger, R.E. Laxdal, G. Morris
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  • M. Dehn
    TUM/Physik, Garching bei München, Germany
  • R. Kiefl
    UBC & TRIUMF, Vancouver, British Columbia, Canada
Abstract 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.
Footnotes & References 1 Grassellino et al. Muon spin rotation studies of niobium for superconducting rf applications.
Phys. Rev. ST Accel. Beams, 16:062002, Jun 2013.
Paper download MOPB051.PDF [1.629 MB / 4 pages]
Poster download MOPB051_POSTER.PDF [0.692 MB]
Conference SRF2015, Whistler, BC, Canada
Series International Conference on RF Superconductivity (17th)
Proceedings Link to full SRF2015 Proccedings
Session Poster Session
Date 14-Sep-15   14:20–17:30
Main Classification Fundamental SRF R&D - Bulk Nb
Keywords cavity, SRF, polarization, detector, niobium
Publisher JACoW, Geneva, Switzerland
Editors Robert E. Laxdal (TRIUMF, Vancouver, BC, Canada); Jana Thomson (TRIUMF, Vancouver, BC, Canada); Volker RW Schaa (GSI, Darmstadt, Germany)
ISBN 978-3-95450-178-6
Published December 2015
Copyright
Copyright © 2015 by JACoW, Geneva, Switzerland     CC-BY Creative Commons License
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