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Title: Dependence of the residual surface resistance of superconducting radio frequency cavities on the cooling dynamics around T c

Abstract

We report a strong effect of the cooling dynamics through $$T_\mathrm{c}$$ on the amount of trapped external magnetic flux in superconducting niobium cavities. The effect is similar for fine grain and single crystal niobium and all surface treatments including electropolishing with and without 120$$^\circ$$C baking and nitrogen doping. Direct magnetic field measurements on the cavity walls show that the effect stems from changes in the flux trapping efficiency: slow cooling leads to almost complete flux trapping and higher residual resistance while fast cooling leads to the much more efficient flux expulsion and lower residual resistance.

Authors:
; ; ;
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:
1402847
Report Number(s):
arXiv:1401.7747; FERMILAB-PUB-14-601-TD
Journal ID: ISSN 0021-8979; 1279641
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 115; Journal Issue: 18; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Romanenko, A., Grassellino, A., Melnychuk, O., and Sergatskov, D. A. Dependence of the residual surface resistance of superconducting radio frequency cavities on the cooling dynamics around T c. United States: N. p., 2014. Web. doi:10.1063/1.4875655.
Romanenko, A., Grassellino, A., Melnychuk, O., & Sergatskov, D. A. Dependence of the residual surface resistance of superconducting radio frequency cavities on the cooling dynamics around T c. United States. doi:10.1063/1.4875655.
Romanenko, A., Grassellino, A., Melnychuk, O., and Sergatskov, D. A. Wed . "Dependence of the residual surface resistance of superconducting radio frequency cavities on the cooling dynamics around T c". United States. doi:10.1063/1.4875655. https://www.osti.gov/servlets/purl/1402847.
@article{osti_1402847,
title = {Dependence of the residual surface resistance of superconducting radio frequency cavities on the cooling dynamics around T c},
author = {Romanenko, A. and Grassellino, A. and Melnychuk, O. and Sergatskov, D. A.},
abstractNote = {We report a strong effect of the cooling dynamics through $T_\mathrm{c}$ on the amount of trapped external magnetic flux in superconducting niobium cavities. The effect is similar for fine grain and single crystal niobium and all surface treatments including electropolishing with and without 120$^\circ$C baking and nitrogen doping. Direct magnetic field measurements on the cavity walls show that the effect stems from changes in the flux trapping efficiency: slow cooling leads to almost complete flux trapping and higher residual resistance while fast cooling leads to the much more efficient flux expulsion and lower residual resistance.},
doi = {10.1063/1.4875655},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 18,
volume = 115,
place = {United States},
year = {2014},
month = {5}
}

Works referenced in this record:

Study of the surface resistance of superconducting niobium films at 1.5 GHz
journal, May 1999


Nitrogen and argon doping of niobium for superconducting radio frequency cavities: a pathway to highly efficient accelerating structures
journal, August 2013


Strong Meissner screening change in superconducting radio frequency cavities due to mild baking
journal, February 2014

  • Romanenko, A.; Grassellino, A.; Barkov, F.
  • Applied Physics Letters, Vol. 104, Issue 7
  • DOI: 10.1063/1.4866013

Impact of cool-down conditions at T c on the superconducting rf cavity quality factor
journal, October 2013

  • Vogt, J. -M.; Kugeler, O.; Knobloch, J.
  • Physical Review Special Topics - Accelerators and Beams, Vol. 16, Issue 10
  • DOI: 10.1103/PhysRevSTAB.16.102002

Dependence of the microwave surface resistance of superconducting niobium on the magnitude of the rf field
journal, June 2013

  • Romanenko, A.; Grassellino, A.
  • Applied Physics Letters, Vol. 102, Issue 25
  • DOI: 10.1063/1.4812665