field of first magnetic flux entry and pinning strength of superconductors for rf application measured with muon spin rotation

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ID: 132502
2018
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Abstract
The performance of superconducting radiofrequency (SRF) cavities used for particle accelerators depends on two characteristic material parameters: field of first flux entry H_{entry} and pinning strength. The former sets the limit for the maximum achievable accelerating gradient, while the latter determines how efficiently flux can be expelled related to the maximum achievable quality factor. In this paper, a method based on muon spin rotation (μSR) is developed to probe these parameters on samples. It combines measurements from two different spectrometers, one being specifically built for these studies and samples of different geometries. It is found that annealing at 1400 °C virtually eliminates all pinning. Such an annealed substrate is ideally suited to measure H_{entry} of layered superconductors, which might enable accelerating gradients beyond bulk niobium technology.
Reference Key
junginger2018physicalfield Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;T. Junginger;S. H. Abidi;R. D. Maffett;T. Buck;M. H. Dehn;S. Gheidi;R. Kiefl;P. Kolb;D. Storey;E. Thoeng;W. Wasserman;R. E. Laxdal
Journal wireless personal communications
Year 2018
DOI
10.1103/PhysRevAccelBeams.21.032002
URL
http://doi.org/10.1103/PhysRevAccelBeams.21.032002
Keywords
radioactivity atomic energy

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