The ITER Central Solenoid Module final test facility

GA has completed the design and is now installing and commissioning the Final Test Facility at the CSM Manufacturing site in Poway, California. The facility includes a number of critical subsystems. The test chamber system consists of a 160 m3 liquid nitrogen shielded cryostat to support the 110-t CSM, a vacuum pumping and leak detection system and Paschen testing equipment. The feeder system connects the test chamber to the cryogenic and electrical systems. It includes a coil termination box (CTB), high temperature superconducting current leads and a superconducting feeder duct. The cryosystem provides refrigeration and circulates supercritical helium at 4.5 K for cooling the CSM and 50 K helium gas for cooling the current leads. The electrical system includes a DC power supply providing 48.5 kA of current and a fast discharge system used for quench protection. The fast discharge system uses redundant DC breakers based on vacuum circuit breaker switching and a 1 Giga-Joule discharge resistor to absorb the stored energy in the coil with a 6 s decay time.