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), auxiliaries and transferred to the primary cooling loops (B50 and B60). The energy, which is injected in the plasma, is totally recovered by the PFCs and transferred to an other primary 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 of the secondary loop cooling towers. Schematically, during a long duration and high energy discharge, only the PFCs primary loop is cooled by the secondary loop, while the hot water from the heating generators primary loops is stored in tanks which were inserted at the outlet leg of the generators. At the end of the discharge, the hot water stored in the tank is cooled when the PFCs primary loop has recovered its initial temperature. In early 2003, the modifications mentioned above were completed and the loops were fully operational. 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. During the discharge, the circulation of one part of the B30 flow is monitored in a heat exchanger to achieve a good stability of the water temperature at the tokamak inlet. This condition is particularly important to measure accurately the energy balance of the tokamak by calorimetry. 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%). The energy radiated by the plasma can be measured from the calorimetry of the panels protecting the vacuum vessel.
Bibliographic Reference: An oral paper given at: 23rd Symposium on Fusion Technology Organised by: Consorzio RFX (IT) Held at: Fondazione Cini, Venice (IT)
Availability: Available from Association EURATOM-CEA, Département de Recherches sur la Fusion Contrôlée, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: firstname.lastname@example.org
Record Number: 200517985 / Last updated on: 2005-03-10
Original language: en
Available languages: en