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Home   /   Thesis   /   Optimized quench detection applied to large superconducting magnets for fusion

Optimized quench detection applied to large superconducting magnets for fusion


The detection of resistive transitions, or quenches, in large superconducting magnets for fusion is essential to guarantee the safety and integrity of the magnet system and its associated Tokamak. The detection scheme is a compromise between a high sensitivity system which triggers numerous false-positives, degrading the system availability, and the protection of the magnet which requires the fastest current dump and energy extraction. This detection is usually done by inductive compensation methods on the coil measured voltages, extracting the resistive voltage from the inductive noise. In Tokamak environment, these voltages are affected by various perturbating signals: Inductive coupling to other coils, currents redistribution inside the conductor, impact of passive structures, plasma movements or heating systems. The PhD programm aims at studying these phenomenons and associated signals, to propose models permitting their simulation during a plasma scenario in order to prepare the most optimized quench detection possible. In particular, the modelling of the fine electromagnetic response of the conductors to the transient electromagnetic environement is foreseen, calculating their potential impact on the detection voltages, threshold and magnet operation.


Institut de recherche sur la fusion par confinement magnétique
Service Tokamak Exploitation et Pilotage
Groupe Cryomagnétisme
Aix-Marseille Université
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