Calorimetry measurements during high energy discharges at Tore Supra

One particularity of Tore Supra is that the Plasma Facing Components (PFCs) are actively cooled, allowing research on long duration and high energy discharges. During a discharge, a large part of the energy is dissipated in the heating generators (ICRH, ECRH and LHH) and auxiliaries. It is transferred to the primary cooling loops (B50 and B60). The energy which is injected in the plasma is totally recovered by the PFCs primary cooling loop B30. The primary loops are cooled via heat exchangers by a secondary loop. The previously existing limitations of the complete Tore Supra cooling system were due to the heat exchange performance to the secondary loop. From 2001 to 2003, the various primary loops have been upgraded and during the 2003 experimental campaign, significant results were obtained, particularly during non inductive discharges with an injected energy by the Lower Hybrid Current Drive (LHCD) system of up to 1.1 GJ. For the long and high energy discharges, the agreement between the energy measured by the calorimetry on the PFCs cooling loop and the HF energy is very good (90 to 95%). Furthermore, calorimetry measurements on the various cooling loop allow to assess the global operation of the cooling system. (authors)