On fault-mode phenomenon in no-insulation superconducting magnets: A preventive approach
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22ja042_full.pdf
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Author(s)
Dong, Fangliang
Park, Dongkeun
Lee, Wooseung
Hao, Luning
Huang, Zhen
Bascuñán, Juan
Jin, Zhijian
Iwasa, Yukikazu
Date Issued
August 2022
Journal
Applied Physics Letters
Publisher
AIP
Abstract
Here, we present experimental and analytical results of a preventive approach applied to a fault-mode phenomenon caused by electrodes or power-source failure in a no-insulation (NI) high-temperature superconducting REBa2Cu3O7−x (REBCO, RE = rare earth) magnet. It is generally agreed that the NI magnets, at least those of laboratory scale, are self-protected from overheating and, therefore, from quenching, chiefly because of turn-to-turn current bypassing unique to NI. However, these NI magnets do experience unexpected quenches, e.g., when the current through the magnet suddenly drops due to the aforementioned fault-mode phenomenon. Here, we report this phenomenon of a sudden-discharging-triggered quench of an NI REBCO coil, conduction-cooled, and operated at 4.2 K. We also present our preventive approach for this phenomenon that relies on an appropriately designed resistor shunted across the coil terminals. With this shunt resistor, a quench was prevented by suppressing the quench initiating turn-to-turn heat and induced overcurrent within the NI winding, and the coil current decayed safely.
Description
Submitted for publication in Applied Physics Letters
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/5.0122493
