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      Analysis of thermal radiation in ion traps for optical frequency standards

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          Abstract

          In many of the high-precision optical frequency standards with trapped atoms or ions that are under development to date, the AC Stark shift induced by thermal radiation leads to a major contribution to the systematic uncertainty. We present an analysis of the inhomogeneous thermal environment experienced by ions in various types of ion traps. Finite element models which allow the determination of the temperature of the trap structure and the temperature of the radiation were developed for 5 ion trap designs, including operational traps at PTB and NPL and further optimized designs. Models were refined based on comparison with infrared camera measurement until an agreement of better than 10% of the measured temperature rise at critical test points was reached. The effective temperature rises of the radiation seen by the ion range from 0.8 K to 2.1 K at standard working conditions. The corresponding fractional frequency shift uncertainties resulting from the uncertainty in temperature are in the 10-18 range for optical clocks based on the Sr+ and Yb+ E2 transitions, and even lower for Yb+ E3, In+ and Al+. Issues critical for heating of the trap structure and its predictability were identified and design recommendations developed.

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          Author and article information

          Journal
          2015-10-19
          2015-11-06
          Article
          10.1088/0026-1394/52/6/842
          1510.05556
          a8326265-1e13-474f-a7ea-4f63fd0ca111

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          Metrologia 52 (2015) 842-56
          16 pages, submitted to Metrologia
          physics.atom-ph physics.ins-det

          Technical & Applied physics,Atomic & Molecular physics
          Technical & Applied physics, Atomic & Molecular physics

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