Design and Operating Features of the ITER 4.5 K Cryoplant
- ITER JWS, Naka-machi 311-0193 (Japan)
- Efremov Institute, St.-Petersburg 189631, Metallostroy (Russian Federation)
- CEA-Grenoble, Service Des Basses Temperatures, F-38054 (France)
- AIR LIQUIDE DTA, F-38360 (France)
The main cryogenic users of ITER are the superconducting magnet system and the cryogenic vacuum pumps. The magnet system consists of 18 toroidal field and six poloidal field coils and the central solenoid coils. The cryogenic vacuum pumps contain eight pumps for the vacuum vessel, up to four pumps for the neutral beam injectors and two for the tokamak cryostat.The paper presents the current design status of the ITER cryoplant and its operating features that allow stable and flexible operation for different plasma pulsing scenarios and transient operating modes including cool-down and coil quench. The LHe plant operates in a combined liquefaction / refrigeration mode. Liquefied helium is used for the coil current leads and for cool-down of the cryopumps after their regeneration at 80 K. The operating temperature of the LHe plant can vary in the range of 4.3 K to 4.5 K to satisfy different cooling demands of various plasma scenarios. The LHe plant is designed for a large variation ratio of refrigeration to liquefaction in order to facilitate filling of the coils with a large amount of supercritical helium after a standard cool-down or specific cool-down mode following a fast energy discharge.
- OSTI ID:
- 20653147
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 710; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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