On The Accuracy Of Cs Beam Primary Frequency Standards

J-S Boulanger, R.J. Douglas, J. Vanier, A.G. Mungall, Y.S. Li, C. Jacques

Abstract:	Two effects which influence the accuracy of cesium beam primary frequency standards are examined: (A) Second order Doppler shift, and (B) apparent frequency shift upon reversal of the static C-field (~60 mGauss) in which the hyperfine transitions occur. (A) A new technique for evaluating the velocity distribution of the Cs beam is presented. Using this method, the second order Doppler shift (?f/f = 4 x 10^-13 for our primary standards) can be evaluated to an uncertainty of ?f/f = 10^-15, an improvement on our previous uncertainty of 2 % 10^-14 (B) Progress in understanding the origins of the frequency shift of our primary standards as the static C-field is reversed in direction is reported. This effect has been eliminated in our evaluations of Csv, but not for the CaVI's. Application of these methods in evaluating NRC clocks gives to frequency shift outside previously published error budgets.
Published in:	Proceedings of the 16th Annual Precise Time and Time Interval Systems and Applications Meeting November 27 - 29, 1984 NASA Goddard Space Flight Center Greenbelt, Maryland
Pages:	59 - 80
Cite this article:	Boulanger, J-S, Douglas, R.J., Vanier, J., Mungall, A.G., Li, Y.S., Jacques, C., "On The Accuracy Of Cs Beam Primary Frequency Standards," Proceedings of the 16th Annual Precise Time and Time Interval Systems and Applications Meeting, Greenbelt, Maryland, November 1984, pp. 59-80.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In