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Title: Nb 3Sn superconducting radiofrequency cavities: Fabrication, results, properties, and prospects

A microns-thick film of Nb 3Sn on the inner surface of a superconducting radiofrequency (SRF) cavity has been demonstrated to substantially improve cryogenic efficiency compared to the standard niobium material, and its predicted superheating field is approximately twice as high. We review in detail the advantages of Nb 3Sn coatings for SRF cavities. We describe the vapor diffusion process used to fabricate this material in the most successful experiments, and we compare the differences in the process used at different labs. We overview results of Nb 3Sn SRF coatings, including CW and pulsed measurements of cavities as well as microscopic measurements. We discuss special considerations that must be practised when using Nb 3Sn cavities in applications. Lastly, we conclude by summarizing the state-of-the-art and describing the outlook for this alternative SRF material.
Authors:
ORCiD logo [1] ;  [2]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Cornell Lab. for Accelerator-Based Sciences and Education, Ithaca, NY (United States)
Publication Date:
Report Number(s):
FERMILAB-PUB-17-133-TD
Journal ID: ISSN 0953-2048; 1594852
Grant/Contract Number:
AC02-07CH11359; SC0008431
Type:
Published Article
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
Journal Volume: 30; Journal Issue: 3; Journal ID: ISSN 0953-2048
Publisher:
IOP Publishing
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; superconducting cavities; niobium–tin; particle accelerators; superconducting thin films; superconducting materials
OSTI Identifier:
1341257
Alternate Identifier(s):
OSTI ID: 1341258; OSTI ID: 1353387

Posen, S., and Hall, D. L.. Nb3Sn superconducting radiofrequency cavities: Fabrication, results, properties, and prospects. United States: N. p., Web. doi:10.1088/1361-6668/30/3/033004.
Posen, S., & Hall, D. L.. Nb3Sn superconducting radiofrequency cavities: Fabrication, results, properties, and prospects. United States. doi:10.1088/1361-6668/30/3/033004.
Posen, S., and Hall, D. L.. 2017. "Nb3Sn superconducting radiofrequency cavities: Fabrication, results, properties, and prospects". United States. doi:10.1088/1361-6668/30/3/033004.
@article{osti_1341257,
title = {Nb3Sn superconducting radiofrequency cavities: Fabrication, results, properties, and prospects},
author = {Posen, S. and Hall, D. L.},
abstractNote = {A microns-thick film of Nb3Sn on the inner surface of a superconducting radiofrequency (SRF) cavity has been demonstrated to substantially improve cryogenic efficiency compared to the standard niobium material, and its predicted superheating field is approximately twice as high. We review in detail the advantages of Nb3Sn coatings for SRF cavities. We describe the vapor diffusion process used to fabricate this material in the most successful experiments, and we compare the differences in the process used at different labs. We overview results of Nb3Sn SRF coatings, including CW and pulsed measurements of cavities as well as microscopic measurements. We discuss special considerations that must be practised when using Nb3Sn cavities in applications. Lastly, we conclude by summarizing the state-of-the-art and describing the outlook for this alternative SRF material.},
doi = {10.1088/1361-6668/30/3/033004},
journal = {Superconductor Science and Technology},
number = 3,
volume = 30,
place = {United States},
year = {2017},
month = {1}
}