JT-60SA Central Solenoid Conductor Hotspot Risk Analysis for High Voltage Protection
Zani Louis·Hamada Kazuya·Luca NOVELLO·Q. Le Coz·Benoit LACROIX·MARÍA MERCEDES GUZMÁN CASADO·Murakami Haruyuki·Sonoda Shogo·Théo FRANCONNET
The upgrade to JT-60SA tokamak (R=3m, a=1.2m) was conducted within a Europe-Japan collaboration agreement featuring the implementation of superconducting magnets. In 2021, an arcing issue on EF1 coil led to an overall magnets insulation reinforcement against high voltage. The Central Solenoid (CS), less accessible for repair, deserves specific attention versus its voltage exposure. Risk mitigation was initiated by decreasing the power supply voltage during plasma scenario current transients. But