Influence of the dynamic ergodic divertor on the density limit in TEXTOR |
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| Authors: | Liang Y Koslowski H R Kelly F A Tokar M Z Loozen X Bertschinger G Biel W Finken K H Jakubowski M W Krämer-Flecken A Zimmermann O Lehnen M Sergienko G Wolf R C;TEXTOR Team |
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| Institution: | Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, Association FZJ-EURATOM, 52425, Jülich Germany. |
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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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