Engineering design demonstrates a dual-stage quench detection system in high-temperature superconducting tokamak magnets, indicating improved operational safety against thermal runaways.
High-temperature superconducting (HTS) tokamak is significantly smaller in size than low-temperature superconducting (LTS) tokamak. A HTS toroidal field (TF) coil will be manufactured to study the feasibility of HTS tokamak. To ensure the safety of the TF coil, a preliminary design of quench detection system (QDS) has been completed. The QDS consists of a primary detection system and a secondary detection system. The primary detection system based on voltage signal employs co-wound LTS wire and balanced bridge method to mitigate induced voltage noise. To prevent the quench signal from going undetected, a secondary detection system based on radio-frequency reflected wave signal and thermal-hydraulic signals is designed to ensure the safety of the TF magnet system.
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Zhang et al. (2025) studied this question.
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