RESEARCHES ON DRIFT ELECTRON BEAM IN ELECTRON INJECTION BY ELECTRIC DRIFT ON TOKAMAK

The motion regularity of the electron in frift electron beam were studied. The expressions of the motion trajectory and the drift velocity of electron were obtained in added externally electric field, toroidal magnetic field and selffield. For two schemes of setting cathode, forming conditions, shapes, steady conditions, and required voltages of drift electron beam were discussed and compared, and it was better to set the cathode vertically to toroidal magnetic field.