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

Ravaioli, E.; Davis, D.; Marchevsky, M.; Sabbi, G. L.; Shen, T.; Verweij, A.; Zhang, K.

doi:10.1088/1402-4896/ab4570

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

Journal Article · 04 December 2019 · Physica Scripta

DOI: https://doi.org/10.1088/1402-4896/ab4570 · OSTI ID:1574355

^[1]; Davis, D. ^[2]; Marchevsky, M. ^[3]; Sabbi, G. L. ^[3];

^[3]; Verweij, A. ^[4]; Zhang, K. ^[5]

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)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); China Scholarship Council

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1574355

Journal Information:: Physica Scripta, Journal Name: Physica Scripta Journal Issue: 1 Vol. 95; ISSN 0031-8949

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Dipole Magnets Above 20 Tesla: Research Needs for a Path via High-Temperature Superconducting REBCO Conductors Wang, Xiaorong; Gourlay, Stephen A.; Prestemon, Soren O. Instruments, Vol. 3, Issue 4 https://doi.org/10.3390/instruments3040062	journal	November 2019

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