Details
| Original language | English |
|---|---|
| Article number | 842 |
| Journal | Metrologia |
| Volume | 52 |
| Issue number | 6 |
| Publication status | Published - 12 Nov 2015 |
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 five 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.
Keywords
- blackbody radiation shift, ion clocks, ion traps, optical atomic clocks, thermal and high frequency finite element method modelling
ASJC Scopus subject areas
- Engineering(all)
- General Engineering
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In: Metrologia, Vol. 52, No. 6, 842, 12.11.2015.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Analysis of thermal radiation in ion traps for optical frequency standards
AU - Doležal, Miroslav
AU - Balling, Petr
AU - Nisbet-Jones, Peter B.R.
AU - King, Steven A.
AU - Jones, Jonathan M.
AU - Klein, Hugh A.
AU - Gill, Patrick
AU - Lindvall, Thomas
AU - Wallin, Anders E.
AU - Merimaa, Mikko
AU - Tamm, C.
AU - Sanner, Christian
AU - Huntemann, Nils
AU - Scharnhorst, Nils
AU - Leroux, Ian D.
AU - Schmidt, Piet Oliver
AU - Burgermeister, Tobias
AU - Mehlstäubler, Tanja E.
AU - Peik, Ekkehard
PY - 2015/11/12
Y1 - 2015/11/12
N2 - 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 five 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.
AB - 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 five 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.
KW - blackbody radiation shift
KW - ion clocks
KW - ion traps
KW - optical atomic clocks
KW - thermal and high frequency finite element method modelling
UR - http://www.scopus.com/inward/record.url?scp=84947942766&partnerID=8YFLogxK
U2 - 10.1088/0026-1394/52/6/842
DO - 10.1088/0026-1394/52/6/842
M3 - Article
AN - SCOPUS:84947942766
VL - 52
JO - Metrologia
JF - Metrologia
SN - 0026-1394
IS - 6
M1 - 842
ER -