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Erschienen in:
2020 | OriginalPaper | Buchkapitel
Progress Towards a Miniaturized Mercury Ion Clock for Space Application
verfasst von : Hao Liu, Yihe Chen, Bibo Yan, Ge Liu, Lei She
Erschienen in: China Satellite Navigation Conference (CSNC) 2020 Proceedings: Volume II
Verlag: Springer Nature Singapore
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Abstract
A compact mercury ion microwave clock prototype using sealed vacuum system has been developed in Wuhan institute of Physics and Mathematics (WIPM) since 2018. In this letter, we report the recent progress on this small prototype. After one year’s sealed-off, the ion trapping time in sealed vacuum tube is measured to ~73 h. It is much longer than the trapping time in previous turbo pumped vacuum system. By optimizing the time sequence of the clock operation and bias magnetic field intensity, the signal to noise ratio (SNR) of the clock transition is significantly enhanced. A short-term frequency stability of 4.5 × 10−13/τ1/2 (τ = 4–104 s) has been achieved.