Linear Paul trap design for an optical clock with Coulomb crystals |
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Authors: | N. Herschbach K. Pyka J. Keller T. E. Mehlst?ubler |
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Affiliation: | 1. Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116, Braunschweig, Germany
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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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