Electron Beam Focusing Using Current-Carrying Plasmas in High-νγDiodes

A technique has been demonstrated for concentrating electron beams to 5×${10}^6$ A/${\mathrm{cm}}^2$ plasmas on the axis of diodes. A two-dimensional particle code has been used to illustrate the importance of both the $\overrightarrow{\mathrm{E}}\times \overrightarrow{\mathrm{B}}$ motion in vacuum and the self-pinch of the beam within the plasma.