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

Junginger, Tobias; Abidi, S. H.; Maffett, R. D.; Buck, T.; Dehn, M. H.; Gheidi, S.; Kiefl, R.; Kolb, Philipp; Storey, D.; Thoeng, E.; Wasserman, W.; Laxdal, R. E.

doi:10.1103/PhysRevAccelBeams.21.032002

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

Journal Article · Fri Mar 16 00:00:00 EDT 2018 · Physical Review Accelerators and Beams

DOI:https://doi.org/10.1103/PhysRevAccelBeams.21.032002· OSTI ID:1438430

Junginger, Tobias ^[1]; Abidi, S. H. ^[2]; Maffett, R. D. ^[3]; Buck, T. ^[4]; Dehn, M. H. ^[4]; Gheidi, S. ^[2]; Kiefl, R. ^[5]; Kolb, Philipp ^[6]; Storey, D. ^[7]; Thoeng, E. ^[5]; Wasserman, W. ^[4]; Laxdal, R. E. ^[8]

Lancaster Univ., Lancaster (United Kingdom); Cockcroft Institute, Warrington (United Kingdom)
Univ. of Toronto, Toronto, ON (Canada)
Univ. of Waterloo, Waterloo, ON (Canada)
Univ. of British Columbia, Vancouver, BC (Canada)
Univ. of British Columbia, Vancouver, BC (Canada); TRIUMF Canada's National Lab. for Particle and Nuclear Physics, Vancouver, BC (Canada)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of Victoria, Victoria, BC (Canada); TRIUMF Canada's National Lab. for Particle and Nuclear Physics, Vancouver, BC (Canada)
TRIUMF Canada's National Lab. for Particle and Nuclear Physics, Vancouver, BC (Canada)

Here, 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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0012704

OSTI ID:: 1438430

Report Number(s):: BNL-204653-2018-JAAM; PRABCJ; TRN: US1900439

Journal Information:: Physical Review Accelerators and Beams, Vol. 21, Issue 3; ISSN 2469-9888

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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References (26)

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Critical fields of Nb ₃ Sn prepared for superconducting cavities Keckert, S.; Junginger, T.; Buck, T. Superconductor Science and Technology, Vol. 32, Issue 7 https://doi.org/10.1088/1361-6668/ab119e	journal	May 2019

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