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This paper describes the results of impurity seeding experiments using neon gas injection into the private flux zone of an ohmically heated tokamak à configuration variable (TCV) single null lower, deuterium fuelled, open divertor configuration. In these first experiments, neon has been injected under feedback control on the intensity of the UV Ne VIII line at 77 nm. Measurements at the outboard divertor target show the divertor in the absence of neon to be operating in the low recycling regime. Neon is observed to penetrate easily into the confined plasma at all densities, increasing core radiation and suppressing radiation in the divertor. This suppression is accompanied by reductions of power and particle flux to the divertor target and D (alpha) emission in the divertor volume.

Additional information

Authors: PITTS R A ET AL, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Article: Journal of Nuclear Material (1998)
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