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(FT/2-3) Status of WENDELSTEIN 7-X Construction

M. Wanner^1)
 
1) Max-Planck-Institut für Plasmaphysik, Greifswald, Germany

Abstract.  WENDELSTEIN 7-X (W7-X) shall confirm the favourable plasma properties and the high density and beta limits of the helical advanced stellarator and demonstrate steady state operation. The magnetic configuration of W7-X is characterised by a set of 50 non-planar and 20 planar superconducting coils. The magnet system will be cooled to 3.3 K, manufactured and assembled to a precision of a few millimetres and maintain its symmetry during cool-down to cryogenic temperatures. Power supplies allow to adjust the magnetic field in the range of a few mT and safely dump the magnet energy in case of a quench. The plasma vessel gives maximum space for the plasma and is kept symmetrically w.r.t. the plasma by dedicated means. Steady state heating is achieved by 10 MW ECR. Energy and particles are controlled by a continuously working divertor. All plasma facing surfaces are covered by CFC, graphite and B4C. The status of construction is reviewed and details of construction are described.

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