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The superconducting toroidal field system of Tore Supra is one of the major aspects of this tokamak. Because of the permanent field produced by its 18 superconducting coils, this system is very well adapted to sustain long time plasmas for heating and confinement studies. After the test of the system in November 1989 up to 1455 A(4.5T on the plasma axis), it has been operated for about one year. During this period, special attention has been paid to the system monitoring. Five detection systems acting independently ensure good reliability of the safety procedure in case of resistive transition. The classical differential voltage detection plays an important part. In addition, important experience has been gained of the thermal behaviour of a coil in case of local heating, giving practical basis for overpressure and temperature increase detections. The quench of coil BT4 due to nuclear radiation in December 1989, following a severe plasma disruption at 1.9 MA, has demonstrated the ability of the safety system to detect the transition and to limit the energy dissipated inside the coil through a low voltage orientated discharge.

Additional information

Authors: DUCHATEAU J L ET AL., CEA, Département de Recherches sur la Fusion Contrôlée, Saint Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: Applied Superconductivity Conference, Aspen, Colorado (US), Sept. 24-28, 1990
Availability: Available from (1) as Paper EN 35717 ORA
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