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Abstract

A study of the power supply and protection circuits for the toroidal field coil system of NET is described. For the purpose of the study a coil system is assumed in which there are 16 D-shaped coils, each of which has 330 turns. The coils use Nb-3Sn supraconductor and are internally cooled by the forced flow of supercritical helium. The nominal coil current is 24 kA and the total magnetic energy stored in the coil system is 17.75 GJ. The coils can be charged in a period of about 2 hours and scheduled discharges will be made at a similar rate. In the event of a coil "quench", however, the coils are discharged much more rapidly to limit the temperature rise in the conductor. The performances of a number of rapid discharge circuits are examined and their relative merits are compared. The best overall performance is obtained if alternate coils are connected in series to provide two separate circuits. Alternative arrangements for the integration of the power supply with the protection circuits are considered and their relative merits are discussed.

Additional information

Authors: HICKS J B CULHAM LABORATORY, ABINGDON (UK), CULHAM LABORATORY, ABINGDON (UK)
Bibliographic Reference: WRITE TO UKAEA, CULHAM LABORATORY, ABINGDON, OXFORDHSHIRE OX14 3DB (UK), MENTIONING REPORT CLM/RR/N 3/1, 1985
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