Numerical Calculation Of Tokamak Plasma Edge Radius Electric Field Induced By Charge Separating

The confinement of high temperature plasma is a basic question of achieving controllable fusion .It is concerned that how to improve the confinement on the Tokamaks plasma. Since the H-mode has been achieved on ASDEX, the research on H mode and L-H transition becomes one of very important field on the fusion program. A lot of experiments indicate that the emergence of negative electrical field at edge of plasma is an important character of the L-H mode transition. The function of negative electrical field on improving plasma confinement has been confirmed. So, it is an important topic about how to get negative electrical field to control L-H mode transition.The radius electric field is induced by charge separating which causes diverse distributions of electron density. Calculating different distribution of radius electric field at plasma edge with the different electron density distributing is important and helpful for understanding the cause of L~H transition and controlling L-H transition.In the paper, the electric field of Tokamak's circinal cross section is calculated by employing computer numerical computation method and Using software MATLAB to program and achieve the 3D pictures. Then, the best electron density distribution, which is in favor of L-H transition is got.In the paper, the result is proved reliable by comparing the integral method with the finite element method, which is used in the paper.In addition, the paper analyzes the convergence of the algorithm and the convergence rates .in order to control the L-H transition better, besides getting the distribution of plasma edge radius electric field with the distribution of charge, the distribution of electron density with the distribution of radius electric field should be got. In the paper, by the datr-; of radius electric field given by literatures, the distribution of charge is calculated. Then, using the resolved distribution of charge to calculate the radius electric field in the numerical calculation program. The result conforms to the data of i ". terntures. So, it is proved that the programs are reliable.