title: High-voltage testing of a 500-kV dc photocathode electron gun.
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.
authors.affiliation: Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan. nagai.ryoji@jaea.go.jp
authors.forename: Ryoji
authors.initials: R
authors.lastname: Nagai
authors.forename: Ryoichi
authors.initials: R
authors.lastname: Hajima
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Nishimori
authors.forename: Toshiya
authors.initials: T
authors.lastname: Muto
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yamamoto
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Honda
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Miyajima
authors.forename: Hokuto
authors.initials: H
authors.lastname: Iijima
authors.forename: Masao
authors.initials: M
authors.lastname: Kuriki
authors.forename: Makoto
authors.initials: M
authors.lastname: Kuwahara
authors.forename: Shoji
authors.initials: S
authors.lastname: Okumi
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Nakanishi