RESULTS AND MODELING OF HIGH-POWER EDGE RADIATION COOLING IN TEXTOR

It has been shown recently on TEXTOR that it is possible to obtain sta ble discharges with good thermal confinement under quasi-stationary co nditions with a cold radiative boundary, by injecting the impurities N e and/or Si. In the first part the main experimental results are summa rized. In the second part a first attempt is presented for the modelli ng of the basic transport processes in these discharges. This is done by using the codes TRANSP for interpretative simulations and RITM for predictive simulations. We find that the bulk confinement is favorably influenced by the application of edge cooling and a satisfactory agre ement is obtained between the predictions of RITM and the experimental results.