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:
-
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- European Organization for Nuclear Research (CERN), Geneva (Switzerland)
- 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.
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. https://doi.org/10.1088/1402-4896/ab4570
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. https://doi.org/10.1088/1402-4896/ab4570. https://www.osti.gov/servlets/purl/1574355.
@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}
}
Web of Science
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