| 153 | 2 | 76 |
| 下载次数 | 被引频次 | 阅读次数 |
汞离子钟因其独特的优势，有望成为未来深空探测和下一代全球导航系统的核心装备。离子阱中离子云的性质，对汞离子钟的性能指标有重要影响。在绝热近似条件下，基于多极阱中离子数密度的径向分布模型，采用经典四阶龙格-库塔数值计算方法，从阱电极数和离子数的角度出发，分析了离子阱区内囚禁电势的组成及其分布，阐述了多极阱中汞离子云变化规律的物理机制，讨论了多极阱内的空间电荷效应以及二阶多普勒频移变化的成因，并同四极阱作了相应的比对研究。在此基础上提出了一些抑制空间电荷效应影响，减小二阶多普勒频移的建议。该项工作进一步深化了多极阱囚禁离子的技术研究，有助于提升离子钟的设计能力。
Abstract：With the development of quantum frequency standard technology, mercury ion clock is expected to become the core equipment of deep space exploration and next generation GNSS because of its unique advantages.Ion cloud in an ion tarp is very important to the performance of the mercury ion clock.Based on the model of ion number density distribution along the radial direction in a multipole trap and the classical fourth-order Runge-Kutta method, the composition and distribution of trapping potential in the ion trap region are analyzed by changing the electrode number and ion number, the physical mechanism of mercury ion variation in the multipole traps is expounded, and the space charge effect and the cause of second-order Doppler shift are discussed.The results are compared with those of the quadruple trap.On this basis, some suggestions are given to suppress the influence of space charge effect and reduce the second-order Doppler shift.This work further deepens the technical research of ion trapping in multipole trap and helps to improve the design ability of ion clocks.
[1] ELY T A,BURT E A,MEMBER,et al.Using the deep space atomic clock for navigation and science[J].IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control,2018,65(6):950-961.
[2] 翟造成，李玉莹.下一代星载原子钟的新发展[J].全球定位系统，2010,35(5):1-5.
[3] 赵春勃，张荣彦，屈勇晟，等.汞离子钟的研究现状及星载的发展建议[C]//第六届中国卫星导航学术年会论文集，西安：中国卫星导航学术年会组委会，2015.
[4] BURT E A,MEMBER,IEEE.A compensated multi-pole linear ion trap mercury frequency standard for ultra-stable timekeeping[J].IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control,2018,55(12):2586-2595.
[5] BURT E A,TJOELKER R L.Characterization and reduction of number dependent sensitivity in multi-pole linear ion trap standards[C]//Joint IEEE International Frequency Symposium and Precise Time and Time Interval (PTTI) Systems and Applications Meeting,Vancouver:IEEE,2005:466-471.
[6] BURT E A,TJOELKER R L,TU M,et al.Compact microwave mercury ion clock for deep-space applications[C]//IEEE International Frequency Control Symposium Joint with the 21st European Frequency and Time Forum,Geneva:IEEE,2007,1113-1115.
[7] PRESTAGE J D,WEAVER G L.Atomic clocks and oscillators for deep-space navigation and radio science[J].Procee-dings of the IEEE,2007,95(11):2235-2247.
[8] PRESTAGE J D,CHUNG S,THANH L E,et al.Small mercury ion clock for on-board spacecraft navigation[R].Jet Propulsion Laboratory,2004.
[9] BURT E A,PRESTAGE J D,TJOELKER R L,et al.The deep space atomic clock:the first demonstration of a trapped ion atomic clock in space[J].Nature,2020.
[10] PRESTAGE J D,TJOELKER R L,MALEKI L.Higher pole linear traps for atomic clock applications[C]//Proceedings of the 1999 Joint Meeting of the European Frequency and Time Forum and the IEEE International Frequency Control Symposium,Besancon:IEEE,1999:121-124.
[11] 佘磊.双曲面型Paul 阱Hg离子微波频标实验进展[D].武汉：中国科学院武汉物理与数学研究所，2008.
[12] 李海霞.对分段线型离子阱及库仑晶体中离子宏运动的研究[D].武汉：中国科学院武汉物理与数学研究所，2019.
[13] 王朝全，涂建辉，党文强，等.应用于微波钟的十六极线型阱中汞离子囚禁数值及仿真研究[J].时间频率学报，2019,42(2):115-127.
基本信息:
DOI：10.13875/j.issn.1674-0637.2022-02-0134-09
中图分类号:TM935.115
引用信息:
[1]杨军,朱宏伟,刘志栋.多极阱中汞离子数密度分布对二阶多普勒频移的影响[J].时间频率学报,2022,45(02):134-142.DOI:10.13875/j.issn.1674-0637.2022-02-0134-09.
基金信息:
真空技术与物理重点实验室基金资助项目(ZD161904)
2022-04-15
2022-04-15