HIGH-POWER MAGNETRON INJECTION GUN NOISE STUDY.
Triannual progress rept. no. 2, 1 Sep 66-1 Jan 67,
MICHIGAN UNIV ANN ARBOR ELECTRON PHYSICS LAB
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The objective of this research is to investigate the stability and noise characteristics of electron beams formed by high-power magnetron injection guns. Expressions have been obtained relating the cathode current density and cathode configuration to the space-charge-flow characteristics of the hollow beam in the drift region. The problem of electron motion at relativistic velocities has been evaluated for a hollow beam assuming that the induced magnetic fields are negligible. The Poisson cell investigations have been concerned with the 4-degree MIG configuration and with the evaluation of the effect of electrode asymmetries on the electron-beam formation. The digital computer trajectory program has been modified in an attempt to produce convergence. Various parts of the Monte Carlo program have been considered in more detail. The routines for specifying the configuration geometry and assigning appropriate boundary conditions are nearing completion. The experimental 4-degree MIG was investigated at higher voltages and the beam profiles were compared with previous results. The beam characteristics were observed to differ from those obtained with the 8-and 12-degree configurations.
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