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Hydrogen masers and cesium fountains at NRCThe NRC masers H-3 and H-4 have been operating since June 1993 with cavity servo control. These low-flux active H masers are showing stabilities of about 10(exp -15) from 1 hour to several days. Stability results are presented, and the current and planned uses of the masers are discussed. A cesium fountain primary frequency standard project has been started at NRC. Trapping and launching experiments with the goal of 7 m/s launches are beginning. We discuss our plans for a local oscillator and servo that exploit the pulsed aspect of cesium fountain standards, and meet the challenge of 10(exp -14) tau(exp -1/2) stability without requiring masers. At best, we expect to run this frequency standard initially for periods of hours each working day rather than continuously for years, and so frequency transfer to outside laboratories has been carefully considered. We conclude that masers (or other even better secondary clocks) are required to exploit this potential accuracy of the cesium fountain. We present and discuss our conclusion that it is feasible to transfer frequency in this way with a transfer-induced uncertainty of less than 10(exp -15), even in the presence of maser frequency drift and random walk noise.
Document ID
19940026159
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Boulanger, J.-S. (National Research Council of Canada Ottawa Ontario, Canada)
Morris, D. (National Research Council of Canada Ottawa Ontario, Canada)
Douglas, R. J. (National Research Council of Canada Ottawa Ontario, Canada)
Gagne, M.-C. (National Research Council of Canada Ottawa Ontario, Canada)
Date Acquired
September 6, 2013
Publication Date
May 1, 1994
Publication Information
Publication: NASA. Goddard Space Flight Center, The 25th Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting
Subject Category
Lasers And Masers
Accession Number
94N30664
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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