Abstract
A 3.6 MW (-66 kV/55 A) Gyrotron power supply system was developed for the 170 GHz ECH&CD gyrotron system in KSTAR. This power supply system consists of Cathode Power Supply(CPS), Anode Power Supply(APS) and Body Power Supply(BPS). The CPS is using the Pulse Step Modulation by the 32set of IGBT choppers. The respons time of Chopper is very fast. So the cathode voltaget is able to be controlled rapidly. The APS is a sort of voltage devider using zener and switch component. It was achieved 3kHz modulation operation. The BPS is combined the commercial power supply and special high voltage switches. It is very simple topology but 5kHz modulation was accomplished easily. Theses power supply system were installed and commissioned successfully in 2011. This paper presents the topology of the each power supply and test result for 170 GHz gyrotron in KSTAR.
Highlights
The high voltage power supply system consists of a HVDC generator for supplying cathode voltage, an anode voltage controller, a body power supply (BPS)
This paper presents the topology of the each power supply and test result for 170 GHz gyrotron in KSTAR
The HVDC generator is capable of supplying a maximum voltage of -66 kV and a current of 55 A to the cathode with respect to the collector and its DC voltage generation is based on the Pulse Step Modulation (PSM) principle which is a series connection of elementary rectifier and IGBT switching powermodules
Summary
The high voltage power supply system consists of a HVDC generator for supplying cathode voltage , an anode voltage controller (mod-anode), a body power supply (BPS). The HVDC generator is capable of supplying a maximum voltage of -66 kV and a current of 55 A to the cathode with respect to the collector and its DC voltage generation is based on the Pulse Step Modulation (PSM) principle which is a series connection of elementary rectifier and IGBT switching powermodules (called as chopper). The highvoltage switching system for the cathode is made by parallel and series connections of many MOSFET fast solid-state switch of which switching time is less than 1 microsecond It can turn on the high voltage pulse to the cathode with a rise time of 30 microseconds from 0 kV to 60 kV and the opening time of 4 microseconds. The series solid-state switch is introduced in the BPS and on-off modulation up to 5 kHz synchronized with mod-anode circuit is possible. EPJ Web of Conferences presents the key features of DC generator, mod-anode, and body power supply for 170 GHz gyrotron in KSTAR
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