Beam charge feedback system for thermionic cathode RF-gun

被引：0

作者：

Ohgaki, H. ^{[1
]}

Kii, T. ^{[1
]}

Masuda, K. ^{[1
]}

Yamazaki, T. ^{[1
]}

Yoshikawa, K. ^{[1
]}

Zen, H. ^{[1
]}

机构：

[1] Kyoto Univ, Inst Adv Energy, Kyoto 6110011, Japan

来源：

2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 | 2007年

关键词：

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A feedback system to stabilize a long-time operation of thermionic cathode RF-Gun has been developed in Kyoto University free electron laser (KU-FEL) facility where a 4.5-cell thermionic cathode RF-gun provides electron beam to drive a mid-infrared FEL. Since the back-bombardment effect seriously increases the temperature of the cathode surface and, consequently, increases the beam charge, a stable operation is difficult without continuous control of the thermal emission from the cathode. We have tried to stabilize the beam charge of the thermionic cathode RF-gun by using a feedback system. The beam charge was monitored with a current transformer (CT), which was located at the exit of the gun, was read by an oscilloscope. The total charge was calculated in a PC and the LabView PID-module controlled the cathode heater current. As the result, the long term stability of the beam charge was dramatically improved from 18%/h to 0.1%/h in variation. The variation at the undulator section was also improved, 1.2%/h.

引用

页码：824 / 826

页数：3

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