中国物理B ›› 2018, Vol. 27 ›› Issue (4): 43701-043701.doi: 10.1088/1674-1056/27/4/043701

• TOPIC REVIEW—Thermal and thermoelectric properties of nano materials • 上一篇    下一篇

Quantitative evaluation of space charge effects of laser-cooled three-dimensional ion system on a secular motion period scale

Li-Jun Du(杜丽军), Hong-Fang Song(宋红芳), Shao-Long Chen(陈邵龙), Yao Huang(黄垚), Xin Tong(童昕), Hua Guan(管桦), Ke-Lin Gao(高克林)   

  1. 1. China Academy of Space Technology(Xi'an), Xi'an 710100, China;
    2. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
    3. Key Laboratory of Atomic Frequency Standards, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
    4. Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China;
    5. University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2017-11-03 修回日期:2017-12-21 出版日期:2018-04-05 发布日期:2018-04-05
  • 通讯作者: Hua Guan E-mail:guanhua@wipm.ac.cn
  • 基金资助:

    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0304401), the National Natural Science Foundation of China (Grant Nos. 11622434, 11474318, 91336211, and 11634013), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030100), Hubei Province Science Fund for Distinguished Young Scholars (Grant No. 2017CFA040), and the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. 2015274).

Quantitative evaluation of space charge effects of laser-cooled three-dimensional ion system on a secular motion period scale

Li-Jun Du(杜丽军)1,2, Hong-Fang Song(宋红芳)2,3,4,5, Shao-Long Chen(陈邵龙)2,3,4,5, Yao Huang(黄垚)2,3,4, Xin Tong(童昕)2,3,4, Hua Guan(管桦)2,3,4, Ke-Lin Gao(高克林)2,3,4   

  1. 1. China Academy of Space Technology(Xi'an), Xi'an 710100, China;
    2. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
    3. Key Laboratory of Atomic Frequency Standards, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
    4. Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China;
    5. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-11-03 Revised:2017-12-21 Online:2018-04-05 Published:2018-04-05
  • Contact: Hua Guan E-mail:guanhua@wipm.ac.cn
  • Supported by:

    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0304401), the National Natural Science Foundation of China (Grant Nos. 11622434, 11474318, 91336211, and 11634013), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030100), Hubei Province Science Fund for Distinguished Young Scholars (Grant No. 2017CFA040), and the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. 2015274).

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摘要：

In this paper, we introduce a method of quantitatively evaluating and controlling the space charge effect of a laser-cooled three-dimensional (3D) ion system in a linear Paul trap. The relationship among cooling efficiency, ion quantity, and trapping strength is analyzed quantitatively, and the dynamic space distribution and temporal evolution of the 3D ion system on a secular motion period time scale in the cooling process are obtained. The ion number influences the eigen-micromotion feature of the ion system. When trapping parameter q is~0.3, relatively ideal cooling efficiency and equilibrium temperature can be obtained. The decrease of axial electrostatic potential is helpful in reducing the micromotion heating effect and the degradation in the total energy. Within a single secular motion period under different cooling conditions, ions transform from the cloud state (each ion disperses throughout the envelope of the ion system) to the liquid state (each ion is concentrated at a specific location in the ion system) and then to the crystal state (each ion is subjected to a fixed motion track). These results are conducive to long-term storage and precise control, motion effect suppression, high-efficiency cooling, and increasing the precision of spectroscopy for a 3D ion system.

关键词: space charge effects, cooling dynamics, ion trajectory, ion energy

Abstract:

In this paper, we introduce a method of quantitatively evaluating and controlling the space charge effect of a laser-cooled three-dimensional (3D) ion system in a linear Paul trap. The relationship among cooling efficiency, ion quantity, and trapping strength is analyzed quantitatively, and the dynamic space distribution and temporal evolution of the 3D ion system on a secular motion period time scale in the cooling process are obtained. The ion number influences the eigen-micromotion feature of the ion system. When trapping parameter q is~0.3, relatively ideal cooling efficiency and equilibrium temperature can be obtained. The decrease of axial electrostatic potential is helpful in reducing the micromotion heating effect and the degradation in the total energy. Within a single secular motion period under different cooling conditions, ions transform from the cloud state (each ion disperses throughout the envelope of the ion system) to the liquid state (each ion is concentrated at a specific location in the ion system) and then to the crystal state (each ion is subjected to a fixed motion track). These results are conducive to long-term storage and precise control, motion effect suppression, high-efficiency cooling, and increasing the precision of spectroscopy for a 3D ion system.

Key words: space charge effects, cooling dynamics, ion trajectory, ion energy

中图分类号:  (Ion trapping)

  • 37.10.Ty
37.10.Rs (Ion cooling) 37.90.+j (Other topics in mechanical control of atoms, molecules, and ions) 31.15.xv (Molecular dynamics and other numerical methods)