Research Of Electron Injection On J-TEXT Tokamak

It is found that there is strong relation between the radial electric field at the edge of plasma and the improvement of confinement. The project of Electron Injection is to control the edge plasma electric field and study the change of plasma by injection of electron beams, furthermore, to explore the mechanism of confinement improvement In1990s, Yuan Pan suggested injecting electrons into the plasma by E×B drift to control radial electrical field and induce plasma rotation and improve confinement. The ideal has been tested on the HT-6M tokamak in Institute of Plasma Physics and received some achievements. it is necessary for electron injection to be considered and systematically studied again after J-TEXT tokamak re-built,. In the thesis, the author demonstrated the principle of electron injection based on the comprehensive investigation of electron injection and tokamak electric field in the world and designed the electron injection on J-TEXT tokamak based on E×B drift, considering the environments of the tokamak. The main achievement include under the background of magnetic confined fusion and the world progress of electron injection and related research, designed the principle of electron injection based on the analysis of J-TEXT tokamak physics and the application of electron drift theory; designed the electron injection system based on the principle, situation of technologies and the requirements of J-TEXT tokamak, including the designs of electrostatic field configuration, hot cathode, vacuum system and power supply; planned several key parts of the experiments, performed basic cathode test and the electron injection under the toroidal field environment; summarized the whole research work and suggested the future research blueprint and proposal.