Divertor helium pumping in TdeV-96 under various conditions
Journal of Nuclear Materials(1999)
摘要
In this paper, we report on the effects of density, divertor geometry and ECRH heating on divertor pressure and helium enrichment. Low, medium and high (semi-detached) densities were investigated with outboard pumping (OB) and private region pumping (PR). For OH discharges, density and geometry effects are compared with B2-EIRENE simulations. There is general agreement with experiments, except for the high density, private region pumping case where the experimental enrichment is lower than predicted. We studied the effect of H- and L-modes on He pumping. L-modes gave the highest divertor pressures and enrichment. H-modes did not affect appreciably the total pressure but the enrichment decreased. Finally, the effects of baffling, biasing and divertor fuelling are discussed; and a comparison is made between a two-reservoir and four-reservoir model for particle balance.
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P05,P06
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