Influence of the Dynamic Ergodic Divertor on the Density Limit in TEXTOR

Y. Liang, H. R. Koslowski, F. A. Kelly, M. Z. Tokaŕ, X. Loozen, G. Bertschinger, W. Biel, K.H. Finken, M. Jakubowski, A. Krämer-Flecken,

Physical Review Letters · 2005 · 27 citations · 12 references

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Abstract

A significant influence of the dynamic ergodic divertor (DED) on the density limit in TEXTOR has been found. In Ohmic discharges, where without DED detachment normally arises at the density limit, a MARFE (multifaceted asymmetric radiation from the edge) develops when the DED is operated in a static regime. The threshold of the MARFE onset in the neutral beam heated plasmas is increased by applying 1 kHz ac DED at the high-field side. The theoretical predictions based on the parallel energy balance taking poloidal asymmetries into account agree well with the experimental observation.

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