5-9 September 2016
Prague Congress Centre
Europe/Prague timezone

P2.123 Structural analysis of the W7-X cryopump during the superconducting coil fast discharge event

6 Sep 2016, 14:20
1h 40m
Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Foyer 2A (2nd floor), 3A (3rd floor)

Prague Congress Centre

5. května 65, Prague, Czech Republic
Board: 123
Poster F. Plasma Facing Components P2 Poster session

Speaker

Zhongwei Wang (Max-Planck-Institut für Plasmaphysik)

Description

The cryopump will be installed for the high power and long pulse operation up to 30 minutes of Wendelstein 7-X (W7-X). The cryopump system plays a critical role for capturing ash particles from the plasma, including hydrogen, deuterium and even helium. In total there are 10 independent cryopumps, one cryopump for each of the 10 discrete divertor units. The cryopump is located along the pumping gap in the toroidal direction below the divertor target modules and close to the location where field lines hit the divertor target surface. Each pump has a design envelop of ~400mm diameter and ~4m length, and is fixed to the plasma vessel by 8 supports. Three independent cooling loops of water, LN2 and LHe, respectively, supply the cooling requirements at different conditions for its operation. During a fast discharge event of the W7-X superconducting coils, the changing magnetic field will induce eddy currents on the metallic cryopump components, especially on the low resistance copper plates and baffle fins. Mechanical forces and moments will be applied on the cryopump structure as a result of the combination of the eddy current and the background magnetic field. In order to check the impact of these mechanical loads on the structure of the cyopump, a series of electromagnetic and mechanical analyses has been performed to find out the field from the superconducting coils and plasma, the eddy current and the Lorentz force on the different cryopump components.

Co-authors

Boris Mendelevitch (Max-Planck-Institut für Plasmaphysik, Garching bei Muenchen, Germany) Gunnar Ehrke (Max-Planck-Institut für Plasmaphysik, Greifswald, Germany) Jean Boscary (Max-Planck-Institut für Plasmaphysik, Garching bei Muenchen, Germany) Reinhold Stadler (Max-Planck-Institut für Plasmaphysik, Garching bei Muenchen, Germany) Zhongwei Wang (Max-Planck-Institut für Plasmaphysik, Garching bei Muenchen, Germany)

Presentation Materials

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