THE TORE SUPRA POLOIDAL FIELD SYSTEM POWER SUPPLIES
The Tore Supra Tokamak permits, owing to the toroidal superconducting coils and the poloidal field system performances to realize long discharges, up to 30 seconds and more, for a nominal plasma current of 1.7 MA. Longer discharges are foreseen with a lower plasma current value. The Tore Supra poloidal field system fulfills in a single set of coils and power supplies, all the necessary functions: premagnetization, ohmic heating, vertical field control, feed-back loops for plasma current amplitude, plasma cross section shape and horizontal and vertical displacements; it permits also to realize cleaning discharges by using capacitive energy (150 kJ) to produce a plasma current of 100 kA during 50 ms every 3 seconds. Normal discharges use the magnetic energy (45 MJ max) stored during the premagnetization in the poloidal field coils to drive the plasma current rise; this operation requires the use of a powerful solid state DC circuit breaker (660 MVA max) connected in parallel with the main converter GO and the coils in order to reduce the conduction time to less than 25 ms, independently of the premagnetization phase duration and thus to minimize the DC breaker cost. Nine four-quadrant thyristor converters constituted of series and/or parallel arrangements of standard Graetz bridge units with freon 113 cooler, are connected to the coils for a total installed power of 315 MW. All these converters are fed through electrical transformers from the 400 kV network, without any intermediate rotating machine energy storage, after an intermediate step at 66 kV, common to the poloidal field system and the additional heating.
Bibliographic Reference: 14TH SOFT CONFERENCE, AVIGNON (FRANCE), SEPT. 8-12, 1986 VOL. 1, PP. 875-882 1895 P., 1986, VOL. 1 AND VOL. 2, ISBN 0 08 034935 8 WRITE TO PERGAMON PRESS, HEADINGTON HILL HALL, OXFORD, OX3 0BW (UK), PRICE: UKL 220 (FOR BOTH VOLS.)
Record Number: 1989126042401 / Last updated on: 1989-01-01
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