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The Wendelstein 7-X experiment is a concept test for properties of reactor relevant plasmas in advanced stellarators. Prominent features include a modular superconducting coil assembly, a fivefold toroidal symmetry and a helical magnetic axis. Due to the optimization process, W7-X is characterized by a vacuum magnetic field configuration with smooth magnetic surfaces, improved equilibrium properties with a weak dependence of rotational transform and shear on the plasma pressure beta, good magneto-hydrodynamic stability properties, reduced neoclassical transport losses and negligible bootstrap current in the long mean-free-path regime, good collisionless alpha-particle confinement in an equivalent reactor, and, as a technical aspect, good feasibility of the superconducting modular coils. W7-X will be heated by continuous electron cyclotron resonance heating and pulsed neutral beam injection and cyclotron resonance heating. The article describes the strategy developed which assures that the detailed measurement needs of the W7-X experimental program can be met.

Additional information

Authors: HARTFUSS H J ET AL, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Review of Scientific Instruments, Vol. 68 (1997) No. 2, pp. 1244-1249
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