Steady-state heat and particle removal with the actively cooled Phase III Outboard Pump Limiter in Tore Supra

Tore Supra's Phase III Outboard Pump Limiter (OPL) is a modular actively-cooled midplane limiter, designed for heat and particle removal during long pulse operation. During its initial operation in 1993, the OPL successfully removed about 1 MW of power during ohmically heated shots of up to 10 seconds duration and reached (steady state) thermal equilibrium. The particle pumping of the Phase III OPL was found to be about 50% greater than the Phase II OPL which had a radial distance between the last closed flux surface and the entrance of the pumping throat of 3.5 cm compared with only 2.5 cm for the Phase III OPL. This paper gives examples of power distribution over the limiter from IR measurements of surface temperature and from extensive calorimetry (34 thermocouples and 10 flow meters) and compares the distributions with values predicted by a 3-D model (HF3D) with a detailed magnetic configuration (e.g., includes field ripple)