|Abstract:||This paper describes the recent NIST work on incorporating an optical clock into a time scale. We simulate a time scale composed of continuously-operating commercial hydrogen masers and an optical frequency standard that does not operate continuously as a clock. The simulations indicate that to achieve the same performance of a continuously-operating Cs-fountain time scale, it is necessary to run an optical frequency standard 12 min per half a day, or 1 hour per day, or 4 hours per 2.33 day, or 12 hours per week. Following the simulations, a Yb optical clock at NIST was frequently operated during the periods of 2017 March – April and 2017 late October – late December. During this operation, comb-mediated measurements between the Yb clock and a hydrogen maser had durations ranging from a few minutes to a few hours, depending on the experimental arrangements. This paper analyzes these real data preliminarily, and discusses the results. More data are needed to make a more complete assessment.|
Proceedings of the 49th Annual Precise Time and Time Interval Systems and Applications Meeting
January 29 - 1, 2018
Hyatt Regency Reston
|Pages:||11 - 21|
|Cite this article:||
Sherman, Jeffrey, Fortier, Tara, Yao, Jian, Parker, Thomas, Levine, Judah, Savory, Joshua, Romisch, Stefania, McGrew, William, Zhang, Xiaogang, Nicolodi, Daniele, Fasano, Robert, Schaeffer, Stephan, Beloy, Kyle, Ludlow, Andrew, "Incorporating an Optical Clock into a Time Scale at NIST: Simulations and Preliminary Real-Data Analysis," Proceedings of the 49th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, January 2018, pp. 11-21.
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