Developmental Techniques and Electron Optical Studies of High Voltage, High Current Electron Guns

Abstract

The progress of the electron gun design, limiting to axially symmetric geometries is discussed here with a view to utilise such guns for electron accelerators. The mechanical design features leading to the physical configuration of the gun with stringent tolerances are outlined. Vacuum processing is done at pressures of 1.3 × 10−7 Pa. The gun employs W-filament emitter or a cathode pellet with bombarder service. A water cooled compact faraday cup is used to measure the electron current. Electron gun geometries have been studied using the computer programme. The perveance of the gun is 0.7 × 10−7 A/V1.5 at 80 kV. Developmental techniques of such pulsed electron guns are described.