Evaluation of Voltage Between Conductors for Resonance Phenomenon and Transient Response in JT-60SA Central Solenoid

An inhomogeneous voltage distribution in the coil is induced by the resonance phenomenon and transient response caused by the power supply. Therefore, damage to the insulation between conductors in the coils is possible. We created the circuit simulation models of the central solenoid (CS) module (the 52-layer pancake coil) with the room-temperature busbar and superconducting current feeder between the power supply and CS module. Then, we evaluated the behavior of the voltage between the conductors for the resonance phenomenon and transient response caused by the supply voltage in the CS module. Based on the results, we can conclude that the influences of resonance phenomenon and transient response on the voltage between the conductors in the CS module is negligibly small under the expected operating conditions. These results therefore represent important information for the safe operation of the JT-60SA.