Plasma and Fusion Research

Volume 3, S1039 (2008)

Regular Articles

The DED at TEXTOR: Transport and Topological Properties of a Helical Divertor
Michael LEHNEN1), Sadrilla S. ABDULLAEV1), Sebastijan BREZINSEK1), Meike CLEVER1), Jan W. COENEN1), Karl H. FINKEN1), Marcin W. JAKUBOWSKI1,2), Dirk REISER1), Detlev REITER1), Ulrich SAMM1), Dominik SCHEGA1), Oliver SCHMITZ1), Henning STOSCHUS1), Bernhard UNTERBERG1) and the TEXTOR team
1)
Institut für Energieforschung - Plasmaphysik, Forschungszentrum Jülich GmbH, EURATOM Association, Trilateral Euregio Cluster, D-52425 Jülich, Germany
2)
Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Teilinstitut Greifswald, Wendelsteinstr. 1, 17491 Greifswald, Germany
(Received 16 November 2007 / Accepted 5 March 2008 / Published 6 August 2008)

Abstract

The topological and transport properties in the edge plasma of the dynamic ergodic divertor is studied to clarify the functionality of this type of helical divertor. The heat and particle fluxes at the DED target plates were measured with Langmuir probes. Peak fluxes are found where field lines end, which penetrate deep into the plasma. The comparison of the measured target profiles to the magnetic topology shows, that heat and particles are mainly transported to the target plates via flux tubes of short connection length. About 65% of the fluxes are found in areas, where field lines with a connection length of 1-2 poloidal turns connect to the target. Analysis of the source distribution shows, that about 40% of the ion sources lie inside the downstream area of the divertor. The high fraction of convective heat flux prevents from establishing high recycling in the divertor for the pulse type discussed here.

Keywords

TEXTOR, stochastic plasmas, divertor

DOI: 10.1585/pfr.3.S1039

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This paper may be cited as follows:

Michael LEHNEN, Sadrilla S. ABDULLAEV, Sebastijan BREZINSEK, Meike CLEVER, Jan W. COENEN, Karl H. FINKEN, Marcin W. JAKUBOWSKI, Dirk REISER, Detlev REITER, Ulrich SAMM, Dominik SCHEGA, Oliver SCHMITZ, Henning STOSCHUS, Bernhard UNTERBERG and the TEXTOR team, Plasma Fusion Res. 3, S1039 (2008).