RF/LH plasma-surface interaction modeling for TORE SUPRA

The prevailing picture of RF/LH-edge interactions is updated using current data for the relevant processes. A model for RF/LH-edge interactions has been developed and applied to illustrative cases for the long pulse, actively cooled Tore Supra tokamak. Highly localized heat fluxes (5-10 MW/m(2)) have previously been observed with infrared imaging in Tore Supra on RF lateral protection and LH grilles. Surface temperature-dependent impurity generation mechanisms (chemical sputtering and radiation-enhanced sublimation) play an important role. This 3D, time-dependent model incorporates a self-consistent treatment of the enhancement of the local heat flux due to RF/LH processes and calculates the thermal balance for the surface. The model incorporates present estimates for RF near-fields from the RANT-3D code and a local electron-acceleration model for LH interactions.