Abstract
ASDEX Upgrade is a diverter-type tokamak commissioned in the spring of 1991 at IPP, Garching. The highly elongated plasma (elongation factor = 1.6) requires a sophisticated plasma stabilisation system for both horizontal and vertical position control. A system of passive and active coils serves as a means of stabilising the plasma. The two active coils are powered by two 4-quadrant thyristor convertors at a power level of about 30 MVA. A digital computer study has shown that a 4-quadrant, phase-controlled thyristor convertor can stabilise the plasma position of ASDEX Upgrade. In this study, an exact model of the power supply system was used. A thyristor breaking system prevents the active coils from being overcharged by currents induced in the active coils in the event of a fast plasma disruption, where the plasma current of 2 MA decays within several milliseconds. A pyrobreaker serves as a back-up solution if the thyristor protection system fails. This supply and protection system was installed in 1989 and was tested with a dummy load until May 1990. These tests have shown satisfactory results. The final acceptance test with the original load were done in the spring of 1991.
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