A cryogenic radio-frequency ion trap for a 40Ca^(+) optical clock  

作　　者：曾孟彦 黄垚 张宝林 马子晓 郝艳梅 胡如明 张华青 管桦 高克林 Mengyan Zeng;Yao Huang;Baolin Zhang;Zixiao Ma;Yanmei Hao;Ruming Hu;Huaqing Zhang;Hua Guan;Kelin Gao(Huazhong University of Science and Technology,Wuhan 430074,China;State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430071,China;Key Laboratory of Atomic Frequency Standards,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China;Wuhan Institute of Quantum Technology,Wuhan 430206,China)

机构地区：[1]Huazhong University of Science and Technology,Wuhan 430074,China [2]State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430071,China [3]Key Laboratory of Atomic Frequency Standards,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430071,China [4]University of Chinese Academy of Sciences,Beijing 100049,China [5]Wuhan Institute of Quantum Technology,Wuhan 430206,China

出　　处：《Chinese Physics B》2023年第11期232-239,共8页中国物理B（英文版）

基　　金：supported by the National Key R&D Program of China (Grant Nos. 2022YFB3904001 and 2018YFA0307500);the National Natural Science Foundation of China (Grant Nos. 12121004 and 12022414);Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030100);CAS Project for Young Scientists in Basic Research (Grant No. YSBR055);CAS Youth Innovation Promotion Association (Grant Nos. Y201963 and Y2022099);the Natural Science Foundation of Hubei Province (Grant No. 2022CFA013);the Interdisciplinary Cultivation Project of the Innovation Academy for Precision Measurement of Science and Technology (Grant No. S21S2201)。

摘　　要：A liquid-nitrogen cryogenic40Ca^(+)optical clock is presented that is designed to greatly reduce the blackbody radiation(BBR) shift. The ion trap, the electrodes and the in-vacuum BBR shield are installed under the liquid-nitrogen container,keeping the ions in a cryogenic environment at liquid-nitrogen temperature. Compared with the first design in our previous work, many improvements have been made to increase the performance. The liquid-nitrogen maintenance time has been increased by about three times by increasing the volume of the liquid-nitrogen container;the trap position recovery time after refilling the liquid-nitrogen container has been decreased more than three times by using a better fixation scheme in the liquid-nitrogen container;and the magnetic field noise felt by the ions has been decreased more than three times by a better design of the magnetic shielding system. These optimizations make the scheme for reducing the BBR shift uncertainty of liquid-nitrogen-cooled optical clocks more mature and stable, and develop a stable lock with a narrower linewidth spectrum,which would be very beneficial for further reducing the overall systematic uncertainty of optical clocks.

关 键 词：cryogenics ion trapping 40Ca^(+)optical clock 

分 类 号：TH714[机械工程—测试计量技术及仪器]