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Title: Field-Enhanced Superconductivity in High-Frequency Niobium Accelerating Cavities

Abstract

The discovery of nitrogen-doping treatment revealed that the radio frequency surface resistance of niobium resonators may be significantly reduced when nitrogen impurities are dissolved as interstitials in the material. A peculiar behavior exhibited by N-doped cavities is the anti-Q slope, i.e., a reduction in the temperature-dependent component of the surface resistance as a function of the accelerating field. This unusual trend in the surface resistance behavior has been attributed to the presence of interstitial nitrogen in the niobium lattice after the doping treatment. This Letter presents a focused study on the field dependence of the temperature-dependent component of the surface resistance as a function of the cavity resonant frequency. The findings show that the anti-Q slope may appear even in clean niobium cavities if the resonant frequency is high enough, which suggests new routes toward understanding the anti-Q slope effect.

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:
1483718
Alternate Identifier(s):
OSTI ID: 1492411
Report Number(s):
FERMILAB-PUB-19-015-TD
Journal ID: ISSN 0031-9007; PRLTAO; 224801
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Name: Physical Review Letters Journal Volume: 121 Journal Issue: 22; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; superconducting RF

Citation Formats

Martinello, M., Checchin, M., Romanenko, A., Grassellino, A., Aderhold, S., Chandrasekeran, S. K., Melnychuk, O., Posen, S., and Sergatskov, D. A. Field-Enhanced Superconductivity in High-Frequency Niobium Accelerating Cavities. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.121.224801.
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Martinello, M., Checchin, M., Romanenko, A., Grassellino, A., Aderhold, S., Chandrasekeran, S. K., Melnychuk, O., Posen, S., & Sergatskov, D. A. Field-Enhanced Superconductivity in High-Frequency Niobium Accelerating Cavities. United States. https://doi.org/10.1103/PhysRevLett.121.224801
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Martinello, M., Checchin, M., Romanenko, A., Grassellino, A., Aderhold, S., Chandrasekeran, S. K., Melnychuk, O., Posen, S., and Sergatskov, D. A. Wed . "Field-Enhanced Superconductivity in High-Frequency Niobium Accelerating Cavities". United States. https://doi.org/10.1103/PhysRevLett.121.224801.
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@article{osti_1483718,
title = {Field-Enhanced Superconductivity in High-Frequency Niobium Accelerating Cavities},
author = {Martinello, M. and Checchin, M. and Romanenko, A. and Grassellino, A. and Aderhold, S. and Chandrasekeran, S. K. and Melnychuk, O. and Posen, S. and Sergatskov, D. A.},
abstractNote = {The discovery of nitrogen-doping treatment revealed that the radio frequency surface resistance of niobium resonators may be significantly reduced when nitrogen impurities are dissolved as interstitials in the material. A peculiar behavior exhibited by N-doped cavities is the anti-Q slope, i.e., a reduction in the temperature-dependent component of the surface resistance as a function of the accelerating field. This unusual trend in the surface resistance behavior has been attributed to the presence of interstitial nitrogen in the niobium lattice after the doping treatment. This Letter presents a focused study on the field dependence of the temperature-dependent component of the surface resistance as a function of the cavity resonant frequency. The findings show that the anti-Q slope may appear even in clean niobium cavities if the resonant frequency is high enough, which suggests new routes toward understanding the anti-Q slope effect.},
doi = {10.1103/PhysRevLett.121.224801},
journal = {Physical Review Letters},
number = 22,
volume = 121,
place = {United States},
year = {Wed Nov 28 00:00:00 EST 2018},
month = {Wed Nov 28 00:00:00 EST 2018}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevLett.121.224801
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Citation Metrics:
Cited by: 16 works
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Figures / Tables:

FIG. 1 FIG. 1: RT at 2.0 K and 5 MV/m as a function of the resonant frequency. The experimental values for the BCP, EP, N doped, and 120°C baked cavities were compared with the Mattis and Bardeen trend of RT as a function of the resonant frequency simulated with the Halbritter’smore » code. The simulation took into account that each surface treatment modified both the mean free path ℓ and reduced energy gap Δ/kTC.« less
All figures and tables (6 total)
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Works referenced in this record:

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journal, December 2014

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Understanding Quality Factor Degradation in Superconducting Niobium Cavities at Low Microwave Field Amplitudes
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Effect of interstitial impurities on the field dependent microwave surface resistance of niobium
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Impact of nitrogen doping of niobium superconducting cavities on the sensitivity of surface resistance to trapped magnetic flux
journal, February 2016

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Dependence of the residual surface resistance of superconducting radio frequency cavities on the cooling dynamics around T c
journal, May 2014

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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
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    FIG. 1 (p. 2)figure
    TABLE I (p. 2)table
    FIG. 2 (p. 3)figure
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