High-voltage testing of a 500-kV dc photocathode electron gun

Ryoji Nagai; Ryoichi Hajima; Nobuyuki Nishimori; Toshiya Muto; Masahiro Yamamoto; Yosuke Honda; Tsukasa Miyajima; Hokuto Iijima; Masao Kuriki; Makoto Kuwahara; Shoji Okumi; Tsutomu Nakanishi

doi:10.1063/1.3354980

High-voltage testing of a 500-kV dc photocathode electron gun

Rev Sci Instrum. 2010 Mar;81(3):033304. doi: 10.1063/1.3354980.

Authors

Ryoji Nagai¹, Ryoichi Hajima, Nobuyuki Nishimori, Toshiya Muto, Masahiro Yamamoto, Yosuke Honda, Tsukasa Miyajima, Hokuto Iijima, Masao Kuriki, Makoto Kuwahara, Shoji Okumi, Tsutomu Nakanishi

Affiliation

¹ Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan. nagai.ryoji@jaea.go.jp

PMID: 20370167
DOI: 10.1063/1.3354980

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.