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Title: Radio Frequency Magnetic Field Limits of Nb and Nb 3 Sn

Abstract

Superconducting radio frequency (srf) cavities, essential components of many large particle accelerators, rely on the metastable flux-free state of superconducting materials. In this Letter, we present results of experiments measuring the magnetic field limits of two srf materials, Nb and Nb3Sn. Resonators made using these materials were probed using both high power rf pulses and dc magnetic fields. Nb, which is the current standard material for srf cavities in applications, was found to be limited by the superheating field Hsh when prepared using methods to avoid excessive rf dissipation at high fields. Nb3Sn, which is a promising alternative material that is still in the early stages of development for srf purposes, was found to be limited between the onset field of metastability Hc1 and Hsh. Furthermore, analysis of the results shows that the limitation is consistent with nucleation of flux penetration at defects in the rf layer.

Authors:
; ;
Publication Date:
Research Org.:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1198713
Alternate Identifier(s):
OSTI ID: 1235052
Report Number(s):
FERMILAB-PUB-15-548-TD
Journal ID: ISSN 0031-9007; PRLTAO; 047001
Grant/Contract Number:  
ER41628; AC02-07CH11359
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 115; Journal Issue: 4; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 36 MATERIALS SCIENCE

Citation Formats

Posen, S., Valles, N., and Liepe, M. Radio Frequency Magnetic Field Limits of Nb and Nb 3 Sn. United States: N. p., 2015. Web. doi:10.1103/PhysRevLett.115.047001.
Posen, S., Valles, N., & Liepe, M. Radio Frequency Magnetic Field Limits of Nb and Nb 3 Sn. United States. https://doi.org/10.1103/PhysRevLett.115.047001
Posen, S., Valles, N., and Liepe, M. 2015. "Radio Frequency Magnetic Field Limits of Nb and Nb 3 Sn". United States. https://doi.org/10.1103/PhysRevLett.115.047001.
@article{osti_1198713,
title = {Radio Frequency Magnetic Field Limits of Nb and Nb 3 Sn},
author = {Posen, S. and Valles, N. and Liepe, M.},
abstractNote = {Superconducting radio frequency (srf) cavities, essential components of many large particle accelerators, rely on the metastable flux-free state of superconducting materials. In this Letter, we present results of experiments measuring the magnetic field limits of two srf materials, Nb and Nb3Sn. Resonators made using these materials were probed using both high power rf pulses and dc magnetic fields. Nb, which is the current standard material for srf cavities in applications, was found to be limited by the superheating field Hsh when prepared using methods to avoid excessive rf dissipation at high fields. Nb3Sn, which is a promising alternative material that is still in the early stages of development for srf purposes, was found to be limited between the onset field of metastability Hc1 and Hsh. Furthermore, analysis of the results shows that the limitation is consistent with nucleation of flux penetration at defects in the rf layer.},
doi = {10.1103/PhysRevLett.115.047001},
url = {https://www.osti.gov/biblio/1198713}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 4,
volume = 115,
place = {United States},
year = {Tue Jul 21 00:00:00 EDT 2015},
month = {Tue Jul 21 00:00:00 EDT 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at https://doi.org/10.1103/PhysRevLett.115.047001

Citation Metrics:
Cited by: 27 works
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Works referenced in this record:

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