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