J-TEXT Tokamak Electric Drift Electron Injection Power System Design

Electric drift electron injection is in plasma edge area normal to the direction of the longitudinal field on the applied electric field from an electron gun in this orthogonal under the effect of electromagnetic field levels in the drift to the plasma. Electric drift electronic injection system is significant to realize the tokamak plasma low central pressure start and H-mode. J-TEXT tokamak has set up its own electric drift electronic injection system, including the injector and power supply system in two parts. One injector includes hot cathode,plates, mechanical, vacuum flange etc.This article is based on electronic injection drift J-TEXT electric system requirements for the design and development of the power system and its control system, power system is an important part of electric drift electronic injection system as electric drift electron injection provides important protection of realization. Power supply system including high voltage power supply, bias power, scanning power, hot cathode heated power supply and control system.High voltage power supply is divided into positive high-voltage 20KV and 15KV negative voltage power supply, using the same topology, you can remote control function is triggered, the plate between homogenous electrical field. Bias power supply for the-800-800V high precision adjustable power, use of TMS320F2812 controller, PI control algorithm, keyboard and serial port two set value input method and liquid crystal display real-time, with fast track preset waveforms characteristic. Scanning power in adjustable base-wide implementation of scanning, the base value range is 0-400V, scan range is 0-800V. Hot cathode heated power to 100A current heating power supply. The entire power system control system hardware by IPC, two PCI cards: IO1750 card and AD1713 card, digital isolation tank and analog isolation box form, can be preset control timing waveforms, and with the central control and power control system of communication. The entire J-TEXT tokamak electric drift electron injection power supply system has been designed to complete and pass the test, the power running well, test waveform meet the design requirements.The entire J-TEXT tokamak electric drift electron injection power supply system has been designed to complete and pass the test, the power running well, test waveform meet the design requirements.