29th Symposium on Fusion Technology (SOFT 2016)

P3.081 The ITER Central Solenoid Module final test facility*

7 Sep 2016, 11:00

1h 20m

Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Board: 81

Poster E. Magnets and Power Supplies P3 Poster session

Speaker

Kurt Schaubel (ITER CS Project)

Description

General Atomics (GA) is currently manufacturing the ITER Central Solenoid Modules (CSM) under contract to US ITER at Oak Ridge National Laboratory, under the sponsorship of the Department of Energy Office of Science. The contract includes the design and qualification of manufacturing processes and tooling necessary to fabricate seven CSM (6 + 1 spare) that constitute the ITER Central Solenoid. The modules will be produced and delivered to the ITER site during 2018–2020. Each CSM will undergo final testing at GA to verify performance. Testing includes helium leak testing, high voltage insulation testing, cooldown to 4.7K and charging to 48.5 kA followed by a series of tests designed to measure as-built performance of the superconductor. 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 160m³3 liquid nitrogen shielded cryostat to support the 110 ton 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 4.7K for cooling the CSM and 50K helium gas for cooling the current leads. The electrical system includes a DC power supply providing 50kA 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 6s decay time.  *Work was supported by UT-Battelle/ORNL under sponsorship of the US DOE under Awards 4000103039 and DE-AC05-00OR22725.