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

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


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.

Original languageEnglish
Article number033304
JournalReview of Scientific Instruments
Issue number3
Publication statusPublished - 2010


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