The Tore Supra front steering long pulse ECRH antenna. Past experience - Present evolution - Future experiments
The long pulse capability of Tore Supra and its ECRH system makes it an ideal machine to prove long term MHD control as required in ITER. For this work to progress, it must be possible to vary the injection angles in real time under feedback control from measured plasma parameters. At Tore Supra the front mirror position � and hence the injection angles � is adjusted using stepper motors controlled through a serial link. The use of a serial link slows the time response of the system, with a sampling time of the order of 50-100ms being the best achievable. For following the evolution of the current profile this seems fully acceptable, bearing in mind the physical limits to the speed at which the mirrors can be allowed to move. Initial commissioning of such real time control was performed in 2004. Unfortunately, following a limited number of cycles and prior to using the system for plasma experiments, one water bellows in the antenna ruptured indicating a major weakness in the design of the water-cooling system for the antenna. As a consequence the water-cooling of the mobile mirror has been redesigned. Careful calculations and subsequent tests have been used to optimise the trajectories of the flexible water connections and a more robust layout is being implemented, ready for operation in the summer 2005.
Bibliographic Reference: An oral paper given at: Third IAEA TM On EECRH in Iter Organised by: International Atomic Energy Agency, Vienna (AT) Held at: Società del Casino, Como, Italy
Availability: Available from Association EURATOM-CEA, Departement de Recherches sur la Fusion Controlee, 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: email@example.com
Record Number: 200518125 / Last updated on: 2005-05-20
Original language: en
Available languages: en