Author/Authors :
Schmitz، نويسنده , , O. and Harting، نويسنده , , D. and Abdullaev، نويسنده , , S.S. and Brezinsek، نويسنده , , S. and Finken، نويسنده , , K.H. and Frerichs، نويسنده , , H. and Jakubowski، نويسنده , , M. and Lehnen، نويسنده , , M. and Loozen، نويسنده , , X. and Mertens، نويسنده , , Ph. and Reiter، نويسنده , , D. and Samm، نويسنده , , U. and Schweer، نويسنده , , B. and Sergienko، نويسنده , , G. and Tokar، نويسنده , , M.Z. and Unterberg، نويسنده , , B. H. Wolf، نويسنده , , R.C.، نويسنده ,
Abstract :
At TEXTOR the dynamic ergodic divertor (DED) induces a stochastic edge layer by a resonant magnetic perturbation to control heat and particle exhaust. In this paper the characterization of its generic transport properties is described. The radial and poloidal distribution of electron density and temperature is analyzed accompanied by observations of the particle flux to the DED target. These experimental results are compared to the calculated magnetic topology and to results from EMC3/EIRENE modeling. Thereby, the existence of two poloidally separated transport domains is demonstrated: laminar flux tubes are dominated by parallel transport to the DED target – they act analogous to a classical scrape-off layer. In contrast, the adjacent ergodic domains show stochastic transport characteristics with enhanced radial transport.
Keywords :
Ergodic divertor , TEXTOR–DED , Edge transport , Edge modelling , Stochastic boundary
