一种磁选态铯束管的真空设计方法  

Vacuum Design of Magnetic State-Selection Cesium Beam Tube

作　　者：陈江[1] 成大鹏 马寅光[1] 张涤新[1] 崔敬忠[1] 

机构地区：[1]兰州空间技术物理研究所真空技术与物理重点实验室,兰州730000

出　　处：《真空科学与技术学报》2018年第1期16-19,共4页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金资助项目(61471183;51304100)

摘　　要：密封铯束管是铯原子钟的物理部分,也是一种电真空器件。但是有关铯束管的真空设计方法在文献中很少讨论。本文提出了一种设计方法,该方法基于物理及使用要求。首先根据铯原子束流强度与铯束管内压强关系,得出铯束管的工作压强应当满足的范围,在此基础上以铯束管的静态放置时间的要求为依据,定出材料单位面积平均出气率,进而对溅射离子泵的抽速和结构提出要求。文章内容无论对磁选态还是对光抽运密封铯束管的设计都具有参考价值。Herein,we theoretically addressed the issue,rarely reported in literature,of the vacuum design of the magnetic stateselection cesium beam tube（ CBT）,a key component of thecesium atomic clock. To begin with,the operation pressure range of CBT was calculated on the basis of the dependence of atomic beam intensity on the pressure. Next,the outgassing rate of the materials involved was evaluated in terms of the specified storage time. And finally,the pumping speed of the mini sputter ion pump was determined. We suggest that the newly-developed vacuum design may be of some technological interest in design optimization of optically pumped cesium beam tube.

关 键 词：铯束管 材料出气率 溅射离子泵 真空设计 

分 类 号：TH714[机械工程—测试计量技术及仪器] TB79[机械工程—仪器科学与技术]