THE JET POWER SUPPLIES - A REVIEW AFTER ONE YEAR OF OPERATION
The performance of the toroidal and poloidal field power supplies has progressively increased towards the nominal ratings (67 current in the toroidal magnet for 20 s and +- 80 kA current peak in the magnetizing coils to make use of the total flux swing). A flat top current of 67 kA for 10 s was passed through the toroidal magnet. In the poloidal field 40 kA current flowing in the magnetizing coils was interrupted and diverted thus providing 20 V loop voltage sufficient for plasma formation (fast rise phase). At the end of slow rise and flat top phase, 74 kA (magnetizing coils) and 96 kA (poloidal field generator convertor were reached respectively. In the toroidal field power supplies, two thyristor convertors, are connected in series with the generator convertor. In the poloidal field power supplies the ohmic heating circuit modulates the power flow from the generator to the poloidal field coils, interrupting the current at the end of premagnetization to start fast rise and reconnecting the generator convertor to the PF coils at the beginning of slow rise. Moreover, the poloidal vertical field and radial field amplifiers (also fed directly from the grid, at 33 kV) are the power element in the feedback systems for plasma position control.
Bibliographic Reference: WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON OX14 3EA (UK), MENTIONING REPORT JET-P(84)06, 1984
Record Number: 1989124015700 / Last updated on: 1987-01-01
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