分区式线型阱设计及其离子囚禁性能分析  

Design and Performance Analysis of a Segmented Linear Ion Trap

作　　者：杨军[1,2] 朱宏伟 刘志栋[1] YANG Jun;ZHU Hong-wei;LIU Zhi-dong(Lanzhou Institute of Space Technology and Physics,Lanzhou 730000,China;Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou 730000,China)

机构地区：[1]兰州空间技术物理研究所,兰州730000 [2]真空技术与物理重点实验室,兰州730000

出　　处：《宇航计测技术》2022年第3期1-6,共6页Journal of Astronautic Metrology and Measurement

基　　金：真空技术与物理重点实验室基金(ZD161904)资助。

摘　　要：基于分区式线型阱的汞离子微波钟已在国际上首次实现了空间在轨飞行验证,为今后深空探测技术领域实现单向导航奠定了基础。设计了一种基于“四极阱+十二极阱”的分区式线型离子阱,主要采用离子数密度分布模型,数值分析了轴向和径向的势阱结构特征,研究了该离子阱的离子囚禁性能,给出了囚禁离子的设计参数,估算了该离子阱应用于汞离子微波钟的二阶多普勒频移大小。论证了四极阱中实现光抽运与荧光探测,十二极阱中实现离子与微波相互作用及自由演化稳定存储功能的可行性。该项工作对于高性能离子囚禁钟和质谱仪的设计具有一定借鉴意义。The mercury ion microwave clock based on segmented linear ion trap has been verified in orbit for the first time in the world,which lays a foundation for the realization of one⁃way navigation in the field of deep space exploration technology in the future.A segmented linear ion trap based on 4⁃pole linear ion trap and 12⁃pole linear ion trap is designed.The structure characteristics of axial and radial potentials are numerically analyzed by using the models of ion number density distribution.The ion trapping performance of the ion trap is studied,and design parameters of the trapped ion are given,and the second⁃order Doppler shift of mercury ion microwave clock is estimated.The feasibility of realizing optical pumping and fluorescence detection in quadrupole ion trap,ion⁃microwave interaction and free evolution and stable storage in 12⁃pole linear ion trap is indirectly demonstrated.This work has certain reference significance for the design of high performance ion trapping clock and mass spectrometer.

关 键 词：离子阱 离子云 原子钟 质谱仪 深空探测 

分 类 号：TH714.14[机械工程—测试计量技术及仪器] O463[机械工程—仪器科学与技术]