THE EFFECT OF DENSITY ON DIVERTOR CONDITIONS IN ASDEX-UPGRADE

Detailed experimental divertor data are presented on the profiles of d ensity and temperature in the inner and outer divertor fans, the radia ted power distribution, the gas pressure and the spectroscopically der ived particle fluxes, all as a function of the discharge density. At l ow and medium density, the inner divertor is cold and dense compared t o the outer divertor. At high density, strong X-point MARFE and separa trix radiation partially detaches the inner divertor. Probe measuremen ts which penetrate into the X-point MARFE at the outer divertor are pr esented.