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A cryogenic radio-frequency ion trap for a 40Ca+ optical clock |
| Mengyan Zeng(曾孟彦)1,2,3,†, Yao Huang(黄垚)2,3,†, Baolin Zhang(张宝林)2,3, Zixiao Ma(马子晓)2,3,4, Yanmei Hao(郝艳梅)2,3,4, Ruming Hu(胡如明)2,3,4, Huaqing Zhang(张华青)2,3, Hua Guan(管桦)2,3,5,‡, and Kelin Gao(高克林)2,3,§ |
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 |
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Abstract A liquid-nitrogen cryogenic 40Ca+ 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.
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Received: 10 February 2023
Revised: 23 March 2023
Accepted manuscript online: 28 March 2023
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PACS:
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37.10.Ty
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(Ion trapping)
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07.20.Mc
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(Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment)
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95.55.Sh
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(Auxiliary and recording instruments; clocks and frequency standards)
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| Fund: This work was 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. YSBR- 055), CAS Youth Innovation Promotion Association (Grant Nos. Y201963 and Y2022099), the Natural Science Foundation of Hubei Province (Grant No. 2022CFA013), and the Interdisciplinary Cultivation Project of the Innovation Academy for Precision Measurement of Science and Technology (Grant No. S21S2201). |
Corresponding Authors:
Hua Guan, Kelin Gao
E-mail: guanhua@apm.ac.cn;klgao@apm.ac.cn
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Cite this article:
Mengyan Zeng(曾孟彦), Yao Huang(黄垚), Baolin Zhang(张宝林), Zixiao Ma(马子晓), Yanmei Hao(郝艳梅), Ruming Hu(胡如明), Huaqing Zhang(张华青), Hua Guan(管桦), and Kelin Gao(高克林) A cryogenic radio-frequency ion trap for a 40Ca+ optical clock 2023 Chin. Phys. B 32 113701
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