Sub-10-16 Frequency Stability in the JPL Multi-Pole Linear Ion Trap Standard

E. A. Burt, D. G. Enzer, R. T. Wang, W. A. Diener, R. L. Tjoelker

Abstract:	The JPL Multi-pole Linear Ion Trap Standard (LITS) has demonstrated excellent short and long-term frequency stability and reduced sensitivity to its three primary systematic effects: the second-order Doppler shift and second-order Zeeman shift and the pressure shift. In this paper, we report developments that reduce the sensitivity to all residual systematic effects to less than 5x10-17 and show initial long-term comparisons with other highly stable clocks. Using GPS Carrier Phase Time Transfer over a 2-month period the LITS deviated from UTC (USNO) by no more than ±1 ns in phase and had a frequency drift of 0.2(3.0)x10-17/day. We also report a new mode of operation that enables further improved short-term stability to less than 5x 10-14/t1/2, and an atomic line Q of 5x1012, the highest ever demonstrated in a microwave atomic standard operating at room temperature. With these advances, the multi-pole LITS provides a new and unique timekeeping and reference capability in the JPL Frequency Standards Test Laboratory, with broader applicability to national metrology and timekeeping laboratories.
Published in:	Proceedings of the 38th Annual Precise Time and Time Interval Systems and Applications Meeting December 7 - 9, 2006 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	271 - 292
Cite this article:	Burt, E. A., Enzer, D. G., Wang, R. T., Diener, W. A., Tjoelker, R. L., "Sub-10-16 Frequency Stability in the JPL Multi-Pole Linear Ion Trap Standard," Proceedings of the 38th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, December 2006, pp. 271-292.
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