有漂移电子注入时托卡马克中电场分布计算

Study on the Electric Field with Electron Injection by Electric Drift on Tokamak

用有限差分算法数值求解二维泊松方程，得到了有、无电子注入时注入器腔体内和托卡马克真空室壁小园截面上的电场分布。研究不同情况的电场，并讨论了计算结果，认为无翘起平行电极板较为合适，注入电子的密度在１０１３～１０１４ｍ－３时，产生的径向电场即可满足Ｌ—Ｈ模转变的要求。

The poisson equation in two dimension was numerically solved by using finite difference method, and the electric fields, in the section of injector chamber and monir circle of tokamak, were obtained both under without electron injecting and with it. The electric fields, which were produced with difference shape and position of electric plates, voltage and density of injected electron, were studied, and the results were comparatively discussed. The computational results show that the plates withot warped part is more appropriate for electron injection to tokamak plasma by electric drift, and that the radial electric field may satisfy the requirement of L_H mode transition when the density of injected electron is about 10 13 ～10 14 m -3 .