Abstract
We report on the design of a segmented linear Paul trap for optical clock applications using trapped ion Coulomb crystals. For an optical clock with an improved short-term stability and a fractional frequency uncertainty of 10−18, we propose 115In+ ions sympathetically cooled by 172Yb+. We discuss the systematic frequency shifts of such a frequency standard. In particular, we elaborate on high-precision calculations of the electric radiofrequency field of the ion trap using the finite element method. These calculations are used to find a scalable design with minimized excess micromotion of the ions at a level at which the corresponding second-order Doppler shift contributes less than 10−18 to the relative uncertainty of the frequency standard.
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Herschbach, N., Pyka, K., Keller, J. et al. Linear Paul trap design for an optical clock with Coulomb crystals. Appl. Phys. B 107, 891–906 (2012). https://doi.org/10.1007/s00340-011-4790-y
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DOI: https://doi.org/10.1007/s00340-011-4790-y