Abstract
3.6 MW (66 kV/55 A) high voltage power supply system was developed for the 170 GHz ECH&CD system in KSTAR. It consists of the cathode power supply (CPS), anode power supply (APS), and body power supply (BPS). Currently, modulation frequency of APS was limited to less than 1 kHz due to the parasitic capacitance of Zener diode circuit including gyrotron. In order to solve these lacks of controllability and high frequency modulation of APS, the existing APS is replaced by a new type of APS and it is tested for KSTAR 170 GHz gyrotron system. This paper presents the new APS design and characteristics and the test results for 170GHz gyrotron in KSTAR ECH system.
Highlights
In A 3.6 MW (66 kV/55 A) high voltage power supply system was developed for the 170 GHz ECH&CD system in KSTAR
In order to solve these lacks of controllability and high frequency modulation of anode power supply (APS), the existing APS is replaced by a new type of APS and it is tested for KSTAR 170 GHz gyrotron system
The output of Cap Charger Power Supply (CCPS) is rapidly feedback controlled by real time control board using analog comparator circuit
Summary
In A 3.6 MW (66 kV/55 A) high voltage power supply system was developed for the 170 GHz ECH&CD system in KSTAR It consists of the cathode power supply (CPS), anode power supply (APS), and body power supply (BPS). The HVS consists of a on/off switch and a discharging switch which are made by parallel and series connections of many MOSFET fast solid-state switch of which switching on-off time is less than 1 microsecond. This configuration reduced significantly the total parasitic capacitance between cathode and anode in gyrotron. The active cathode-anode voltage control capability will be applicable for the active beam current control to overcome the beam emission cooling effect for the long pulse operation of the gyrotron This paper presents the new APS design and characteristics and the test results for 170GHz gyrotron in KSTAR ECH system
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