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A standard, single null lower diverted discharge has been developed to enable continuous monitoring of the first wall conditions and to characterize the effectiveness and influence of wall conditioning in the variable configuration tokamak (TCV). Measurements over a period encompassing nearly 2000 ohmic discharges of varying configuration and input power show the global confinement time and main plasma impurity concentrations to be good general indicators of the first wall condition, whilst divertor target profiles demonstrate strikingly the short term beneficial effects of He glow. Good agreement, consistent with a reduction in recycling at the plates is found between the predictions of the fluid code UEDGE and the observed outer divertor profiles of T(e) and n(e) before and after He glow.

Additional information

Authors: PITTS R A ET AL, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas, Association EURATOM (CH);PETRZILKA J ET AL, Czech Academy of Sciences, Institute of Plasma Physics, Prague (CZ);REINKE P, Universität Basel, Institut für Physik (CH);RENSINK M ET AL, University of California, Lawrence Livermore National Laboratory (US)
Bibliographic Reference: Article: Journal of Nuclear Materials (1996)
Record Number: 199610713 / Last updated on: 1996-06-21
Original language: en
Available languages: en