High-voltage supply for neutral beam injection in the Tokamak experiment TEXTOR

In 1985, two identical high-voltage power supply systems were installed in the Juelich Nuclear Research Facility in the Federal Republic of Germany. The systems, which began operation in the following year, supply the energy required by both neutral beam injectors used in the TEXTOR fusion experiment. A new, major feature of the power supply systems is their 68 unregulated, series-connected d.c. sources, connected and disconnected by high-speed electronic switches. With this configuration it is possible to obtain a current of 100 A with a resistive load of 550 Ω (corresponding to a load voltage of 55 kV) in 20 μs, and to disconnect the same current in less than 10 μs. A description of the design and operation of the power supplies is followed by a look at the tests performed by the manufacturer during commissioning of the individual modules. (Auth.)