Magnetic Diagnostics for Equiibrium Reconstruction at W7‐X

For W7‐X a set of magnetic diagnostic coils is foreseen to assess plasma properties such as toroidal net current and energy content for real‐time monitoring and also for equilibrium reconstruction. In addition to the set of full Rogowski‐Coils, diamagnetic coils and saddle loops, a set of segmented Rogowski‐Coils is envisaged to access profile information. The planned scheme of equilibrium reconstruction is described and the status of the analysis of the magnetic diagnostics is presented and its prospects are discussed. It is found that the plasma energy may be retrieved with good accuracy. However, the recovery of profile information shows limited accuracy based on the statistical analyses and modeling done so far (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)