摘要
神龙一号直线感应加速器(LIA)产生的强流高功率的脉冲电子束与X光转换靶作用后可以产生高剂量的X光,同时由于转换靶的被烧蚀破坏在靶面产生回流离子,该回流离子的存在影响到电子束的聚焦。设计了4套法拉第筒及其对应的偏压电路,法拉第筒被放置在神龙一号X光转换靶上游不同位置,分布在电子束轴线两侧,电路设计最高偏压为1 kV;对神龙一号LIA的X光转换靶面产生的回流离子进行了实验测量,分别得到回流正离子密度约在1021/m3,离子运动速度可达2～3 mm/s。计算比较表明,该离子流强度与神龙一号靶前电子束流相差很大,只有电子束流强的0.27%,对神龙一号电子束聚焦不会造成影响。
The Dragon- I linear induction accelerator（LIA） uses mm level diameter pulsed electron beam to strike the bremsstrahlung converter target to generate X-ray, which generates the backstreaming ions as well. Four Faraday cups are combined to collect backstreaming ions produced at the bremsstrahlung converter target of the Dragon- ILIA. Experiment and calculation results show that the backstreaming positive ions density and velocity are about 10^21/m3 and 2~3 km/s,respectively. The calculated results show that the intensity of the backstreaming positive ion beam is only 0. 27% of that of the targeting electron beam, thus the backstreaming ions would not affect the focus of the electron beam.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2010年第2期421-424,共4页
High Power Laser and Particle Beams
基金
国防科技基础研究基金项目
关键词
直线感应加速器
束靶作用
回流离子
法拉第筒
linear induction accelerator
beamtarget interaction
backstreaming ion
Faraday cup
