Operational experience of a 500 kV photoemission gun
Operational experience of a 500 kV photoemission gun
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DOI：
10.1103/physrevaccelbeams.22.053402
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发表时间：
2019-05-14
影响因子：
1.7
通讯作者：
Uchiyama, Takashi
中科院分区：
文献类型：
--
作者：
Nishimori, Nobuyuki;Nagai, Ryoji;Uchiyama, Takashi
介绍了高能加速器研究组织紧凑型能量回收直线加速器（cERL）上500 kV光电电子枪的运行经验。日本原子能机构开发的这种枪在cERL安装后不久就被发现十段陶瓷绝缘体中有两段出现故障。直到2015年4月，该枪一直在390 kV下运行，有8个部分，并提供0.9 mA的射束。在原有绝缘子的基础上增加了两段绝缘子，以恢复原有绝缘子的高压性能。然后将枪调节至539 kV，并在500 kV下稳定运行。一旦稳定操作的高阈值电压超过500 kV，在500 kV下观察不到由枪本身引起的放电。在500 kV下，从具有半导体晶片的光电阴极盘产生几皮安的暗电流，而在没有半导体晶片的情况下没有观察到暗电流。稳定产生的500千电子伏的束流大于0.8毫安的证明超过两个小时。
Operational experience of a 500 kV photoemission gun at the compact energy recovery linac (cERL) of the High Energy Accelerator Research Organization is presented. The gun, developed at the Japan Atomic Energy Agency, was found to have failures in two out of the ten-segment ceramic insulator just after installation at cERL. The gun had been operated at 390 kV with eight segments until April 2015 and provided a 0.9 mA beam. An additional two-segment insulator was installed on the top of the existing insulators to recover the high-voltage performance. The gun was then conditioned up to 539 kV and has been operated stably at 500 kV. No discharge caused by the gun itself was observed at 500 kV once the high threshold voltage for stable operation exceeded 500 kV. A dark current of a few picoamperes was generated at 500 kV from a photocathode puck with a semiconducting wafer, while no dark current was observed without a semiconducting wafer. Stable generation of a 500 keV beam with current greater than 0.8 mA was demonstrated for more than two hours.