Reduction of the magnetic sensitivity of an atomic clock against the non-uniformity and variations of the C-field

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Proceedings titleProceedings of the IEEE International Frequency Control Symposium and Exposition
Conference5th Joint Conference of the 65th IEEE International Frequency Control Symposium, IFCS 2011 and 25th European Frequency and Time Forum, EFTF 2011, 1 May 2011 through 5 May 2011, San Fransisco, CA
Article number5977738
SubjectClock transition; Error signal; Feed-Forward; Frequency shift; Larmor frequencies; Magnetic pulse; Magnetic sensitivity; Nonuniformity; Small signal; Atomic clocks; Magnetic fields; Sensitivity analysis
AbstractThe frequency of an atomic clock may be stabilized against C-field variations by applying weak magnetic pulses tuned to the Larmor frequency. The small signal produced by these pulses is a Ramsey spectrum of the Zeeman transitions which, when added to the microwave Ramsey signal, may be adjusted to compensate exactly for the quadratic frequency shift of clock transition at a given value of the C-field. The cancellation is provided by a feed-forward mechanism which modifies the error signal without the need to adjust the C-field. This can be implemented in most atomic clocks by generating the required audio-frequency pulses on wires producing a magnetic field perpendicular to the C-field. © 2011 IEEE.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for National Measurement Standards (INMS-IENM)
Peer reviewedYes
NPARC number21271276
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Record identifier72f334da-c7fe-4525-ac23-ccf670d824f5
Record created2014-03-24
Record modified2016-05-09
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