A Line Cathode Electron Gun of the Pierce-Type Design
- 1 February 1989
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 28 (2R)
- https://doi.org/10.1143/jjap.28.267
Abstract
An electron gun of the Pierce-type configuration with a line cathode of the same size as the electron beam required has been developed. A line-shaped beam measuring 1.1 mm×6.0 mm with a current efficiency of more than 99% was obtained. The electron gun was designed by computer simulation based on the electrolytic-tank method. Calculation within the gun revealed that a negatively biased focus electrode and a line cathode with a rectangular cross section are appropriate to obtain a line-shaped electron beam. Beam uniformity along the line is within ±6% in the middle part 5.0 mm long. The influence of the magnetic field due to the cathode heating current on the beam uniformity was investigated by beam trajectory tracing.Keywords
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