Model for generation of intense electron beam in large-aspect ratio diodes

Electron beam formation was studied in large-aspect ratio high-voltage diodes by a EC 1040 computer and a two-dimensional simulation code. Particle positions and velocities and self-consistent electric and magnetic fields were determined at each calculation step. In the preliminary runs, computation was started near the peak diode voltage. After several time steps the potential minimum was indicated in the vicinity of the cathode boundary. The electric potential and other macroscopic quantities oscillate in time, the space charge density also oscillates in space. (J.U.)