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arXiv · 2603.15244

Quench Protection in Insulated REBCO Conductors: Design Optimization and Fast Detection via REBCO SQD

Hajar Zgour·Walid Abdel Maksoud·Bertrand Baudouy·Antoine Guinet
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Abstract

This work was conducted within the framework of the exploratory French project PEPR SupraFusion, which aims to advance the field of fusion energy by developing High-Temperature Superconductor (HTS)-based demonstrators capable of storing significant energy while operating under high magnetic fields and currents. Ensuring a reliable protection during a quench in Insulated REBCO conductors is challenging\,: slow normal-zone propagation and validation delays allow the hotspot's temperature to reach damaging levels. We compare (i) conductor protection via copper-stabilizer optimization and (ii) a co-wound, REBCO superconducting quench detector (SQD) that is electrically isolated yet thermally coupled and intentionally deoxygenated to lower Tc and Ic for an earlier transition. Onedimensional THEA modeling shows that a good choice of stabilizer cross-section makes the protection possible during quench events by keeping the temperature of the hotspot within a safe limit. The simulations also demonstrate that the use of a REBCO SQD enables the quench detection at lower temperatures.

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Hajar Zgour, Walid Abdel Maksoud, Bertrand Baudouy, Antoine Guinet. 2026-03-16. Quench Protection in Insulated REBCO Conductors: Design Optimization and Fast Detection via REBCO SQD. https://arxiv.org/abs/2603.15244

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