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Title: Analysis of RF losses and material characterization of samples removed from a Nb 3Sn-coated superconducting RF cavity

Abstract

Nb 3Sn (T c≈18 K and H sh≈400 mT) is a prospective material to replace Nb (T c≈9 K and H sh≈200 mT) in SRF accelerator cavities for significant cost reduction and performance enhancement. Because of its material properties, Nb3Sn is best employed as a thin film (coating) inside an already built RF cavity structure. A particular test cavity noted as C3C4 was a 1.5 GHz single-cell Nb cavity, coated with Nb3Sn using Sn vapor diffusion process at Jefferson Lab. Cold measurements of the coated cavity indicated the superconducting transition temperature of about 18 K. Subsequent RF measurements indicated field-dependent surface resistance both at 4.3 K and 2.0 K. After initial cold measurements, the cavity RF loss distribution was studied with a thermometry mapping system. Loss regions were identified with thermometry and were cut out for material analysis. The presence of significantly thin patchy regions and other carbon-rich defects is associated with strong local field-dependent surface resistance. This paper summarizes RF and thermometry results correlated with material science findings.

Authors:
ORCiD logo [1];  [2];  [2];  [3];  [4]
  1. College of William and Mary, Williamsburg, VA (United States)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  4. College of William and Mary, Williamsburg, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1602434
Report Number(s):
[JLAB-ACC-19-3058; DOE-OR-23177-4795]
[Journal ID: ISSN 0953-2048]
Grant/Contract Number:  
[SC0014475; AC05-06OR23177]
Resource Type:
Accepted Manuscript
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
[ Journal Volume: 33; Journal Issue: 4]; Journal ID: ISSN 0953-2048
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Pudasaini, Uttar, Eremeev, Grigory, Reece, Charles E., Tuggle, James, and Kelley, Michael J. Analysis of RF losses and material characterization of samples removed from a Nb3Sn-coated superconducting RF cavity. United States: N. p., 2020. Web. doi:10.1088/1361-6668/ab75a8.
Pudasaini, Uttar, Eremeev, Grigory, Reece, Charles E., Tuggle, James, & Kelley, Michael J. Analysis of RF losses and material characterization of samples removed from a Nb3Sn-coated superconducting RF cavity. United States. doi:10.1088/1361-6668/ab75a8.
Pudasaini, Uttar, Eremeev, Grigory, Reece, Charles E., Tuggle, James, and Kelley, Michael J. Fri . "Analysis of RF losses and material characterization of samples removed from a Nb3Sn-coated superconducting RF cavity". United States. doi:10.1088/1361-6668/ab75a8.
@article{osti_1602434,
title = {Analysis of RF losses and material characterization of samples removed from a Nb3Sn-coated superconducting RF cavity},
author = {Pudasaini, Uttar and Eremeev, Grigory and Reece, Charles E. and Tuggle, James and Kelley, Michael J.},
abstractNote = {Nb3Sn (Tc≈18 K and Hsh≈400 mT) is a prospective material to replace Nb (Tc≈9 K and Hsh≈200 mT) in SRF accelerator cavities for significant cost reduction and performance enhancement. Because of its material properties, Nb3Sn is best employed as a thin film (coating) inside an already built RF cavity structure. A particular test cavity noted as C3C4 was a 1.5 GHz single-cell Nb cavity, coated with Nb3Sn using Sn vapor diffusion process at Jefferson Lab. Cold measurements of the coated cavity indicated the superconducting transition temperature of about 18 K. Subsequent RF measurements indicated field-dependent surface resistance both at 4.3 K and 2.0 K. After initial cold measurements, the cavity RF loss distribution was studied with a thermometry mapping system. Loss regions were identified with thermometry and were cut out for material analysis. The presence of significantly thin patchy regions and other carbon-rich defects is associated with strong local field-dependent surface resistance. This paper summarizes RF and thermometry results correlated with material science findings.},
doi = {10.1088/1361-6668/ab75a8},
journal = {Superconductor Science and Technology},
number = [4],
volume = [33],
place = {United States},
year = {2020},
month = {2}
}

Journal Article:
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