Calibration of Thin-Film Platinum Sensors for Use in the JILA Sr II Clock

Tew, Weston L.; Nicholson, Travis; Huston, Ross B.

doi:10.6028/nist.ir.8046

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…The mounting structures were installed in a test chamber and hand carried on a passenger flight to Gaithersburg, Maryland for calibration at the NIST Sensor Technology Division. At NIST, the sensors were calibrated by comparing them to standard PRTs (SPRTs), traceable to NIST's ITS-90 temperature scale and accurate to 1 mK, using a water comparison bath with 1 mK temperature stability 45 . The temperature uniformity in the isothermal region of the bath is within 1 mK.…”

Section: Temperature Sensorsmentioning

confidence: 99%

Systematic evaluation of an atomic clock at 2 × 10−18 total uncertainty

et al. 2015

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The pursuit of better atomic clocks has advanced many research areas, providing better quantum state control, new insights in quantum science, tighter limits on fundamental constant variation and improved tests of relativity. The record for the best stability and accuracy is currently held by optical lattice clocks. Here we take an important step towards realizing the full potential of a many-particle clock with a state-of-the-art stable laser. Our 87Sr optical lattice clock now achieves fractional stability of 2.2 × 10−16 at 1 s. With this improved stability, we perform a new accuracy evaluation of our clock, reducing many systematic uncertainties that limited our previous measurements, such as those in the lattice ac Stark shift, the atoms' thermal environment and the atomic response to room-temperature blackbody radiation. Our combined measurements have reduced the total uncertainty of the JILA Sr clock to 2.1 × 10−18 in fractional frequency units.

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Section: Temperature Sensorsmentioning

confidence: 99%

Systematic evaluation of an atomic clock at 2 × 10−18 total uncertainty

et al. 2015

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“…The calibration coefficient uncertainties are shown as the blue and orange curves. The red line shows the sum of all other minor errors, including SPRT calibration, bridge nonlinearity, resistance standard and bath stability [44]. We also account for the offset of 3.0 mK between ITS-90 and the definition of thermodynamic temperature, and it's corresponding uncertainty of 0.3 mK is included in the minor errors [44].…”

Section: A2 Temperature Sensor Calibrationmentioning

confidence: 99%

“…The red line shows the sum of all other minor errors, including SPRT calibration, bridge nonlinearity, resistance standard and bath stability [44]. We also account for the offset of 3.0 mK between ITS-90 and the definition of thermodynamic temperature, and it's corresponding uncertainty of 0.3 mK is included in the minor errors [44]. We measure the difference between the high vacuum resistance R vac and the He back-filled case R He as a function of axial gradient T f lange − T bath .…”

Section: A2 Temperature Sensor Calibrationmentioning

confidence: 99%

JILA SrI optical lattice clock with uncertainty of $2.0 \times 10^{-18}$

et al. 2019

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We report on an improved systematic evaluation of the JILA SrI optical lattice clock, achieving a nearly identical systematic uncertainty compared to the previous strontium accuracy record set by the JILA SrII optical lattice clock (OLC) at 2.1 × 10 −18 . This improves upon the previous evaluation of the JILA SrI optical lattice clock in 2013, and we achieve a more than twenty-fold reduction in systematic uncertainty to 2.0 × 10 −18 . A seven-fold improvement in clock stability, reaching 4.8 × 10 −17 / √ τ for an averaging time τ in seconds, allows the clock to average to its systematic uncertainty in under 10 minutes. We improve the systematic uncertainty budget in several important ways. This includes a novel scheme for taming blackbody radiation-induced frequency shifts through active stabilization and characterization of the thermal environment, inclusion of higher-order terms in the lattice light shift, and updated atomic coefficients. Along with careful control of other systematic effects, we achieve low temporal drift of systematic offsets and high uptime of the clock. We additionally present an improved evaluation of the second order Zeeman coefficient that is applicable to all Sr optical lattice clocks. These improvements in performance have enabled several important studies including frequency ratio measurements through the Boulder Area Clock Optical Network (BACON), a high precision comparison with the JILA 3D lattice clock, a demonstration of a new all-optical time scale combining SrI and a cryogenic silicon cavity, and a high sensitivity search for ultralight scalar dark matter. * Equal Contributions

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