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Investigation of spatial structure and sympathetic cooling in the 9Be+–40Ca+ bi-component Coulomb crystals

We study the spatial structure and sympathetic cooling of the bi-component Coulomb crystal(CC),which consists of approximate 450 9Be+ions and 450 40Ca+ions with a mass ratio of 0.225 in a segmented linear ion trap.By two-dimensional imaging of the bi-component CC,the 9Be+ions are found to be surroun...

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Bibliographic Details
Published in:Chinese physics B 2023-02, Vol.32 (3), p.429-434
Main Authors: Li, Min, Zhang, Yong, Zhang, Qian-Yu, Bai, Wen-Li, He, Sheng-Guo, Peng, Wen-Cui, Tong, Xin
Format: Article
Language:English
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Summary:We study the spatial structure and sympathetic cooling of the bi-component Coulomb crystal(CC),which consists of approximate 450 9Be+ions and 450 40Ca+ions with a mass ratio of 0.225 in a segmented linear ion trap.By two-dimensional imaging of the bi-component CC,the 9Be+ions are found to be surrounded by the 40Ca+ions in the radial direction with a separation ratio of~2.0,and the axial length of the 9Be+ions occupied area is much larger than that of the 40Ca+ions occupied area.Combined with the previous experimental results,the structure of the 9Be+-40Ca+CC shows the larger the difference in the mass-charge ratio,the larger the separation between the two species.The comparison of the fluorescence spectra of the 9Be+ions in the bi-component CC and the pure CC indicates that the 9Be+ions can be sympathetically cooled and stably localized by the laser-cooled 40Ca+ions during the recording of the fluorescence spectrum.
ISSN:1674-1056
DOI:10.1088/1674-1056/ac70b2