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In the field of fusion reactor studies, the Tore Supra tokamak explores the route of long duration plasma discharges. A plasma discharge of 4 minutes 25 seconds duration has been performed in 2002 with a world record of injected and extracted energy of 750 MJ. To achieve such performances, the in-vessel components and water-cooling loop were fully renewed. Furthermore each subsystem limitations were deeply analyzed and improved to meet the long pulse requirements, including the data acquisition system (DAS) and the real time plasma control system. New cross controls between subsystems has been developed to improve the level of safety and robustness of the machine operation. These aspects are detailed in the paper. It is worth noting that most of these improvements are relevant to operate tokamaks in a fully steady state regime.

Additional information

Authors: SAINT-LAURENT F ET AL, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An oral paper given at: 9th International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPCS 2003) Organised by: ICALEPCS Steering Committee Held at:Gyeongju, Korea, 13-17 October 2003
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:
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