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Title: Role of thermal resistance on the performance of superconducting radio frequency cavities

Abstract

Thermal stability is an important parameter for the operation of the superconducting radio frequency (SRF) cavities used in particle accelerators. The rf power dissipated on the inner surface of the cavities is conducted to the helium bath cooling the outer cavity surface and the equilibrium temperature of the inner surface depends on the thermal resistance. In this manuscript, we present the results of direct measurements of thermal resistance on 1.3 GHz single cell SRF cavities made from high purity large-grain and fine-grain niobium as well as their rf performance for different treatments applied to outer cavity surface in order to investigate the role of the Kapitza resistance to the overall thermal resistance and to the SRF cavity performance. The results show no significant impact of the thermal resistance to the SRF cavity performance after chemical polishing, mechanical polishing or anodization of the outer cavity surface. Temperature maps taken during the rf test show nonuniform heating of the surface at medium rf fields. Calculations of Q0(Bp) curves using the thermal feedback model show good agreement with experimental data at 2 and 1.8 K when a pair-braking term is included in the calculation of the Bardeen-Cooper-Schrieffer surface resistance. In conclusion, these resultsmore » indicate local intrinsic nonlinearities of the surface resistance, rather than purely thermal effects, to be the main cause for the observed field dependence of Q0(Bp).« less

Authors:
; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1346088
Alternate Identifier(s):
OSTI ID: 1345904
Report Number(s):
JLAB-ACC-16-2350; DOE/OR/-23177-3931
Journal ID: ISSN 2469-9888; PRABCJ; 032003
Grant/Contract Number:  
AC05-06OR23177
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 20 Journal Issue: 3; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Dhakal, Pashupati, Ciovati, Gianluigi, and Myneni, Ganapati Rao. Role of thermal resistance on the performance of superconducting radio frequency cavities. United States: N. p., 2017. Web. doi:10.1103/PhysRevAccelBeams.20.032003.
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Dhakal, Pashupati, Ciovati, Gianluigi, & Myneni, Ganapati Rao. Role of thermal resistance on the performance of superconducting radio frequency cavities. United States. https://doi.org/10.1103/PhysRevAccelBeams.20.032003
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Dhakal, Pashupati, Ciovati, Gianluigi, and Myneni, Ganapati Rao. Tue . "Role of thermal resistance on the performance of superconducting radio frequency cavities". United States. https://doi.org/10.1103/PhysRevAccelBeams.20.032003.
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@article{osti_1346088,
title = {Role of thermal resistance on the performance of superconducting radio frequency cavities},
author = {Dhakal, Pashupati and Ciovati, Gianluigi and Myneni, Ganapati Rao},
abstractNote = {Thermal stability is an important parameter for the operation of the superconducting radio frequency (SRF) cavities used in particle accelerators. The rf power dissipated on the inner surface of the cavities is conducted to the helium bath cooling the outer cavity surface and the equilibrium temperature of the inner surface depends on the thermal resistance. In this manuscript, we present the results of direct measurements of thermal resistance on 1.3 GHz single cell SRF cavities made from high purity large-grain and fine-grain niobium as well as their rf performance for different treatments applied to outer cavity surface in order to investigate the role of the Kapitza resistance to the overall thermal resistance and to the SRF cavity performance. The results show no significant impact of the thermal resistance to the SRF cavity performance after chemical polishing, mechanical polishing or anodization of the outer cavity surface. Temperature maps taken during the rf test show nonuniform heating of the surface at medium rf fields. Calculations of Q0(Bp) curves using the thermal feedback model show good agreement with experimental data at 2 and 1.8 K when a pair-braking term is included in the calculation of the Bardeen-Cooper-Schrieffer surface resistance. In conclusion, these results indicate local intrinsic nonlinearities of the surface resistance, rather than purely thermal effects, to be the main cause for the observed field dependence of Q0(Bp).},
doi = {10.1103/PhysRevAccelBeams.20.032003},
journal = {Physical Review Accelerators and Beams},
number = 3,
volume = 20,
place = {United States},
year = {2017},
month = {3}
}
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https://doi.org/10.1103/PhysRevAccelBeams.20.032003
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Works referenced in this record:

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journal, November 2015

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    Works referencing / citing this record:

    Fabrication and Vertical Test Experience of the European X-ray Free Electron Laser 3.9 GHz Superconducting Cavities
    text, January 2017

    Revealing the role of nitrogen on hydride nucleation and stability in pure niobium using first-principles calculations
    journal, October 2018

    • Garg, P.; Balachandran, S.; Adlakha, I.
    • Superconductor Science and Technology, Vol. 31, Issue 11
    • DOI: 10.1088/1361-6668/aae147
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