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At the advanced stellarator W7-AS, active charge exchange recombination spectroscopy (CXRS) is used to measure the toroidal and poloidal impurity rotation velocity. The radial electric field E(r) is determined experimentally from the radial force balance equation. In parallel, E(r) is calculated by means of the neoclassical drift kinetic equation solver (DKES) transport code. Neoclassical calculation and measurement are, in general, in good agreement. A selection of discharges is presented in this paper which shows typical properties of E(r) at W7-AS, and which highlights the mutual relationship between E(r) and transport.

Additional information

Authors: BALDZUHN J ET AL, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion, Vol. 40 (1998) pp. 967-986
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