The high voltage power supply system of ECRH for HT-7

The 640 kW, 100 ms, -80kV ± 0.3% high voltage power supply (HVPS), one of the most important components in ECRH for Tokamak HT-7, is introduced. The pulse high-voltage capacitors, C=130 uF and V=100 kV, were applied as the primary source. The serial high power tetrode was the system regulator (MOD/REG), and by regulating the tetrode´s voltage drop can obtain steady output voltage. The MOD/REG is being constructed at present. Here, the system structure of MOD/REG is introduced. Especially, the circuit analysis software PSPICE and MATLAB were used to simulate the whole system by modeling the system. The paper also gives the simulative waveforms and measuring waveforms in the resistive dummy load. Then the waveforms´ comparison shows that the experimental performance is much closed to the simulative result. Therefore, the HVPS can meet the requirement of ECRH.