Physics of relativistic electron beams in rectangular and cylindrical geometries
Abstract
The use of electron beams for the direct pumping of lasers for fusion applications requires the generation of large area beams in appropriate geometries. Two geometries which are of particular interest are rectangular electron beams with planar anodes and radially converging beams with cyclindrical anodes. The generation of such beams requires the management of electron trajectories in a complex combination of applied and self-generated electric and magnetic fields. The beam's self-electric field limits the emitted current, and the deflection of the electron in the selfmagnetic field (beam pinch) limits the beam area that can be generated from a single cathode. A simple analytic model is used to derive a scaling relationship for beam pinch in both geometries. Numerical calculations are presented to show the effects of nonuniform electric fields encountered in typical geometries together with supporting experimental measurements.
- Publication:
-
Presented at the 1st Intern. Topical Conf. on Electron Beam Res. and Technol
- Pub Date:
- November 1975
- Bibcode:
- 1975ebrt.confQ...3S
- Keywords:
-
- Electron Beams;
- Plasmas (Physics);
- Relativistic Plasmas;
- Electric Fields;
- Electron Trajectories;
- Laser Applications;
- Magnetic Fields;
- Pinch Effect;
- Nuclear and High-Energy Physics