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Title: A new quench detection method for HTS magnets: stray-capacitance change monitoring

Abstract

Fast quench detection is a key requirement for the successful implementation of superconducting magnet technology. In high temperature superconductor magnets, this issue is especially challenging due to the low quench propagation velocity, and presently represents one of the main factors limiting their application. A new detection technique based on stray-capacitance monitoring is proposed. The capacitance between electrically-insulated magnet elements, such as magnet structure and end parts, is utilized as an indication of local heat deposition in the conductor. In fact, the relative permittivity of helium drops when it changes from the liquid to the gaseous phase. Thus, when heating occurs, part of the helium impregnating the insulation layers boils off, and the monitored stray-capacitance decreases. The proposed technique is successfully demonstrated on three small-scale Bi-2212 magnets manufactured at the Lawrence Berkeley National Laboratory. Results from the detection of thermal runaways and spot-heater induced quenches are reported and discussed. Advantages and limitations of the stray-capacitance method with respect to conventional quench detection methods are assessed.

Authors:
ORCiD logo [1];  [2];  [3];  [3]; ORCiD logo [3];  [4];  [5]
+ Show Author Affiliations
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); China Scholarship Council
OSTI Identifier:
1574355
Alternate Identifier(s):
OSTI ID: 1737597
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physica Scripta
Additional Journal Information:
Journal Volume: 95; Journal Issue: 1; Journal ID: ISSN 0031-8949
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Ravaioli, E., Davis, D., Marchevsky, M., Sabbi, G. L., Shen, T., Verweij, A., and Zhang, K. A new quench detection method for HTS magnets: stray-capacitance change monitoring. United States: N. p., 2019. Web. doi:10.1088/1402-4896/ab4570.
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Ravaioli, E., Davis, D., Marchevsky, M., Sabbi, G. L., Shen, T., Verweij, A., & Zhang, K. A new quench detection method for HTS magnets: stray-capacitance change monitoring. United States. doi:10.1088/1402-4896/ab4570.
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Ravaioli, E., Davis, D., Marchevsky, M., Sabbi, G. L., Shen, T., Verweij, A., and Zhang, K. Wed . "A new quench detection method for HTS magnets: stray-capacitance change monitoring". United States. doi:10.1088/1402-4896/ab4570. https://www.osti.gov/servlets/purl/1574355.
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@article{osti_1574355,
title = {A new quench detection method for HTS magnets: stray-capacitance change monitoring},
author = {Ravaioli, E. and Davis, D. and Marchevsky, M. and Sabbi, G. L. and Shen, T. and Verweij, A. and Zhang, K.},
abstractNote = {Fast quench detection is a key requirement for the successful implementation of superconducting magnet technology. In high temperature superconductor magnets, this issue is especially challenging due to the low quench propagation velocity, and presently represents one of the main factors limiting their application. A new detection technique based on stray-capacitance monitoring is proposed. The capacitance between electrically-insulated magnet elements, such as magnet structure and end parts, is utilized as an indication of local heat deposition in the conductor. In fact, the relative permittivity of helium drops when it changes from the liquid to the gaseous phase. Thus, when heating occurs, part of the helium impregnating the insulation layers boils off, and the monitored stray-capacitance decreases. The proposed technique is successfully demonstrated on three small-scale Bi-2212 magnets manufactured at the Lawrence Berkeley National Laboratory. Results from the detection of thermal runaways and spot-heater induced quenches are reported and discussed. Advantages and limitations of the stray-capacitance method with respect to conventional quench detection methods are assessed.},
doi = {10.1088/1402-4896/ab4570},
journal = {Physica Scripta},
number = 1,
volume = 95,
place = {United States},
year = {2019},
month = {12}
}
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DOI:  10.1088/1402-4896/ab4570
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