The JET Magnet Power Supplies and Plasma Control Systems

Abstract
During a Joint European Torus pulse, the main tokamak loads [the toroidal coils, the transformer coils, the plasma equilibrium coils, and the additional heating devices (not described in this work)] require a total amount of energy of 10000 MJ and a peak power in excess of 1000 MW.The main power source is the U.K.’s Central Electricity Generating Boards’ electric power system supplemented by two identical local motor flywheel generators.Since the tokamak loads require a direct-current (dc) supply, the alternating-current power from the energy sources is converted into dc by a combination of thyristor bridges (static units for the plasma position and shaping control, for the additional heating devices, and partially for the toroidal coils) and diode bridges, directly connected to the output of the two generators for the tokamak transformer coils and partially for the toroidal coils.The ohmic heating circuit modulates the flow of power from the flywheel generator to the transformer coils, and its du...

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