In a steady operation of inertial electrostatic confinement fusion (IECF), the electrons produced within a wire cathode should escape out and reach the anode, on the other hand the ions accelerated towards the cathode should enter the cathode at last. To verify the guess, we developed a 3-D simulation code and studied formation of potential distribution, electron trajectories and ion trajectories. The simulation results support electron streaming-out from the central region through the center area of opening of the cathode, which explain the distinctive discharge called a star mode commonly observed in the IECF experiments.
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