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In order to assess the capability of the Tore Supra ergodic divertor (ED) to retain impurities in the low confinement edge region, spectroscopic observations of a divertor neutralizer plate are reported. The neutral neon density is deduced from these measurements; it increases strongly (up to 1.5 x 10(17) m(-3) per injected Pa 1) when the plasma approaches detachment. The Central neon density is approximately independent of the plasma edge conditions. A 2D model confirms relatively weak measured dependence of the neutral neon penetration on edge electron density and temperature. Comparison of BBQ (3D scrape-off layer Monte-Carlo code) results with 1D impurity radial transport modelling suggests a possible mechanism for the observed weak dependence of core content on edge impurity influx: enhanced exchange between the ergodized layer of the core and the neutralizer region.

Additional information

Authors: GUIRLET R ET AL, CEA, Cadarache, Saint-Paul-lez-Durance (FR);HOGAN J, Oak Ridge National Laboratory, Fusion Energy Division, Oak Ridge, TN (US)
Bibliographic Reference: An article published in: Journal of Nuclear Materials, Vol.290-293 (2001), pp.872-876
Record Number: 200113868 / Last updated on: 2001-10-05
Original language: en
Available languages: en
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