Abstract: | Timekeeping requires practical continuously operating frequency standards with exceptional long-term stability. JPL mercury linear ion trap standards (LITS) operate continuously with short-term stability to 2.0X10^-14/r^1/2 and long-term stability limited by remaining sensitivity to the second order Doppler sh@, which varies with ion number fluctuations. In this paper, we report measurements in a 12-pole trap showing a greater than twenty-fold sensitivity reduction to all parameters affecting the Second-Order Doppler Shift This advance should further improve practical ground-based ion standard stab&y to the 1x10^-16 level and allow significant engineering simplifications enabling small high performance flight standards. |
Published in: |
Proceedings of the 31th Annual Precise Time and Time Interval Systems and Applications Meeting December 7 - 9, 1999 Marriott's Laguna Cliffs Resort Dana Point, California |
Pages: | 597 - 604 |
Cite this article: | Tjoelker, R.L., Prestage, J.D., Maleki, L., "Improved Timekeeping Using Advanced Trapped-Ion Clocks," Proceedings of the 31th Annual Precise Time and Time Interval Systems and Applications Meeting, Dana Point, California, December 1999, pp. 597-604. |
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