Alternative schemes of power deposition with the ergodic divertor on Tore Supra

Two alternative schemes to distribute the energy flux over larger surfaces are proposed and tested at Tore Supra. (i) A good sharing of the energy flu x to the pump limiter and the ergodic divertor (ED) is achieved at a reduce d stochasticity, (ii) The operation at highest densities with the plasma le aning on the high field side is characterised by the same screening propert ies and achievable densities as for the standard operation. The results ind icate that an efficient heat reduction and screening of impurities can be r eached under ED operation, These experiments have partly been carried out i n order to test special aspects of the dynamic ED (DED) at TEXTOR. (C) 2001 Elsevier Science B.V, All rights reserved.