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Title: Critical fields of Nb 3Sn prepared for superconducting cavities

Abstract

Nb$$_3$$Sn is currently the most promising material other than niobium for future superconducting radiofrequency cavities. Critical fields above 120 mT in pulsed operation and about 80 mT in CW have been achieved in cavity tests. This is large compared to the lower critical field as derived from the London penetration depth, extracted from low field surface impedance measurements. In this paper direct measurements of the London penetration depth from which the lower critical field and the superheating field are derived are presented. The field of first vortex penetration is measured under DC and RF fields. The combined results confirm that Nb$$_3$$Sn cavities are indeed operated in a metastable state above the lower critical field but are currently limited to a critical field well below the superheating field.

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [3];  [5];  [3];  [4];  [6];  [7];  [7];  [7];  [1]
  1. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH(HZB), Berlin (Germany); Univ. Siegen, Siegen (Germany)
  2. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH(HZB), Berlin (Germany); TRIUMF Canada’s National Laboratory for Particle and Nuclear Physics, Vancouver (Canada)
  3. TRIUMF Canada’s National Laboratory for Particle and Nuclear Physics, Vancouver (Canada)
  4. Cornell Lab for Accelerator-based Sciences and Education, Ithaca, NY (United States)
  5. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH(HZB), Berlin (Germany)
  6. Cornell Lab for Accelerator-based Sciences and Education, Ithaca, NY (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  7. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1528668
Alternate Identifier(s):
OSTI ID: 1543265
Report Number(s):
arXiv:1810.13301; FERMILAB-PUB-18-778-TD
Journal ID: ISSN 0953-2048; 1701221
Grant/Contract Number:  
AC02-07CH11359; SC0008431
Resource Type:
Journal Article: Published Article
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
Journal Volume: 32; Journal Issue: 7; Journal ID: ISSN 0953-2048
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; superconducting radio frequency; niobium-tin; superconductivity; superheating; critical fields

Citation Formats

Keckert, Sebastian, Junginger, Tobias, Buck, T., Hall, D., Kolb, P., Kugeler, O., Laxdal, R., Liepe, M., Posen, S., Prokscha, T., Salman, Z., Suter, A., and Knobloch, J. Critical fields of Nb3Sn prepared for superconducting cavities. United States: N. p., 2019. Web. doi:10.1088/1361-6668/ab119e.
Keckert, Sebastian, Junginger, Tobias, Buck, T., Hall, D., Kolb, P., Kugeler, O., Laxdal, R., Liepe, M., Posen, S., Prokscha, T., Salman, Z., Suter, A., & Knobloch, J. Critical fields of Nb3Sn prepared for superconducting cavities. United States. doi:10.1088/1361-6668/ab119e.
Keckert, Sebastian, Junginger, Tobias, Buck, T., Hall, D., Kolb, P., Kugeler, O., Laxdal, R., Liepe, M., Posen, S., Prokscha, T., Salman, Z., Suter, A., and Knobloch, J. Thu . "Critical fields of Nb3Sn prepared for superconducting cavities". United States. doi:10.1088/1361-6668/ab119e.
@article{osti_1528668,
title = {Critical fields of Nb3Sn prepared for superconducting cavities},
author = {Keckert, Sebastian and Junginger, Tobias and Buck, T. and Hall, D. and Kolb, P. and Kugeler, O. and Laxdal, R. and Liepe, M. and Posen, S. and Prokscha, T. and Salman, Z. and Suter, A. and Knobloch, J.},
abstractNote = {Nb$_3$Sn is currently the most promising material other than niobium for future superconducting radiofrequency cavities. Critical fields above 120 mT in pulsed operation and about 80 mT in CW have been achieved in cavity tests. This is large compared to the lower critical field as derived from the London penetration depth, extracted from low field surface impedance measurements. In this paper direct measurements of the London penetration depth from which the lower critical field and the superheating field are derived are presented. The field of first vortex penetration is measured under DC and RF fields. The combined results confirm that Nb$_3$Sn cavities are indeed operated in a metastable state above the lower critical field but are currently limited to a critical field well below the superheating field.},
doi = {10.1088/1361-6668/ab119e},
journal = {Superconductor Science and Technology},
issn = {0953-2048},
number = 7,
volume = 32,
place = {United States},
year = {2019},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1088/1361-6668/ab119e

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