OVERVIEW OF W7-X DIAGNOSTICS

An overview of the W7-X concept, parameters and planned diagnostics is given. W7-X allows access for all fusion plasma relevant diagnostics, despite its complex three-dimensional geometry resulting from the HEL IAS (helical advanced stellarator) concept and its realization with su perconducting coils. Special efforts have been made for diagnostics wh ich are relevant for parameters related to the optimization of the con figuration, e.g. very small Shafranov shift, reduced neoclassical tran sport losses in LMFP and plateau, small bootstrap current and good con finement of fast particles at high beta. The island divertor concept n eeds exact local measurements in this region. Suitable diagnostics wil l be installed. (C) 1997 Elsevier Science S.A.