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

Abstract

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.

Authors:
 [1];  [2];  [3];  [4];  [4];  [2];  [5];  [6];  [7];  [5];  [4];  [8]
  1. Lancaster Univ., Lancaster (United Kingdom); Cockcroft Institute, Warrington (United Kingdom)
  2. Univ. of Toronto, Toronto, ON (Canada)
  3. Univ. of Waterloo, Waterloo, ON (Canada)
  4. Univ. of British Columbia, Vancouver, BC (Canada)
  5. Univ. of British Columbia, Vancouver, BC (Canada); TRIUMF Canada's National Lab. for Particle and Nuclear Physics, Vancouver, BC (Canada)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States)
  7. Univ. of Victoria, Victoria, BC (Canada); TRIUMF Canada's National Lab. for Particle and Nuclear Physics, Vancouver, BC (Canada)
  8. TRIUMF Canada's National Lab. for Particle and Nuclear Physics, Vancouver, BC (Canada)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1438430
Report Number(s):
BNL-204653-2018-JAAM
Journal ID: ISSN 2469-9888; PRABCJ
Grant/Contract Number:
SC0012704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 21; Journal Issue: 3; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

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., and Laxdal, R. E. Field of first magnetic flux entry and pinning strength of superconductors for rf application measured with muon spin rotation. United States: N. p., 2018. Web. doi:10.1103/PhysRevAccelBeams.21.032002.
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. Field of first magnetic flux entry and pinning strength of superconductors for rf application measured with muon spin rotation. United States. doi:10.1103/PhysRevAccelBeams.21.032002.
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., and Laxdal, R. E. Fri . "Field of first magnetic flux entry and pinning strength of superconductors for rf application measured with muon spin rotation". United States. doi:10.1103/PhysRevAccelBeams.21.032002. https://www.osti.gov/servlets/purl/1438430.
@article{osti_1438430,
title = {Field of first magnetic flux entry and pinning strength of superconductors for rf application measured with muon spin rotation},
author = {Junginger, Tobias and Abidi, S. H. and Maffett, R. D. and Buck, T. and Dehn, M. H. and Gheidi, S. and Kiefl, R. and Kolb, Philipp and Storey, D. and Thoeng, E. and Wasserman, W. and Laxdal, R. E.},
abstractNote = {Here, the performance of superconducting radiofrequency (SRF) cavities used for particle accelerators depends on two characteristic material parameters: field of first flux entry Hentry 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 Hentry of layered superconductors, which might enable accelerating gradients beyond bulk niobium technology.},
doi = {10.1103/PhysRevAccelBeams.21.032002},
journal = {Physical Review Accelerators and Beams},
number = 3,
volume = 21,
place = {United States},
year = {Fri Mar 16 00:00:00 EDT 2018},
month = {Fri Mar 16 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
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