Author/Authors :
Unterberg، نويسنده , , B. and Abdullaev، نويسنده , , S.S. and Coenen، نويسنده , , J.W. and Finken، نويسنده , , K.H. and Frerichs، نويسنده , , H. and Jakubowski، نويسنده , , M.W. and Kalupin، نويسنده , , D. and Kantor، نويسنده , , M.Yu. and Krنmer-Flecken، نويسنده , , A. and Lehnen، نويسنده , , M. and Liang، نويسنده , , Y. and Samm، نويسنده , , U. and Schmitz، نويسنده , , O. and Soldatov، نويسنده , , S. and Spakman، نويسنده , , G.W. and Stoschus، نويسنده , , H. and Tokar، نويسنده , , M.Z. and van Wassenhove، نويسنده , , G. and Xu، نويسنده , , Y. and Zimmermann، نويسنده , , O.، نويسنده ,
Abstract :
In this contribution, we report on experimental results on edge transport in limiter H-mode plasmas in TEXTOR under the influence of the Dynamic Ergodic Divertor (DED). These plasmas are characterized by a pedestal structure mainly visible in the electron density, resulting in increased electron pressure gradients of up to 30 kPa/m over a pedestal width of 25 mm at high pedestal collisionalities ( ν e ∗ = 1 - 10 ) , and with high frequency ELMs in the range of 300–1500 Hz. Under the influence of DED the pedestal pressure is gradually reduced and completely collapses to L-mode when the laminar zone extends all the way across the pedestal width. Toroidal plasma rotation is maintained at H-mode levels by the torque introduced by DED in the stochastic region. The perturbed magnetic topology has been optimized to access conditions with a density pump-out which are strongly governed by wall pumping capabilities in TEXTOR.
