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Updated: Jun 14, 2026

Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization
Published on: July 12, 2016
High-voltage testing of a 500-kV dc photocathode electron gun
Ryoji Nagai1, Ryoichi Hajima, Nobuyuki Nishimori
1Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan. nagai.ryoji@jaea.go.jp
Abstract:
A high-voltage dc photocathode electron gun was successfully conditioned up to a voltage of 550 kV and a long-time holding test for 8 h was demonstrated at an acceleration voltage of 500 kV. The dc photocathode electron gun is designed for future light sources based on energy-recovery linac and consists of a Cockcroft-Walton generator, a segmented cylindrical ceramic insulator, guard-ring electrodes, a support-rod electrode, a vacuum chamber, and a pressurized insulating gas tank. The segmented cylindrical ceramic insulator and the guard-ring electrodes were utilized to prevent any damage to the insulator from electrons emitted by the support-rod electrode.
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