Electrical Design Requirements on the ITER Coils

The ITER coils are all designed using superconducting conductors with a high current carrying capability. Plasma operation and control requires fast variation of the currents in the pulsed coils inducing more than 10 kV during normal operation on the coil terminals. The power supplies are designed to limit the high voltages, but under short conditions, voltages may rise above 20 kV in certain coils. Moreover, the acceptance tests of the coils must be carried out at higher voltages, up to 28 kV for the CS coils. The electrical design philosophy of the coils includes recovery options in the event of electrical faults internal to the coils.