STATE OF THE ART AND FUTURE DIRECTIONS FOR THE ATOMIC HYDROGEN MASER

Robert F.C. Vessot

Abstract:	The present status of technology development for atomic hydrogen masers (Hmasers) is reviewed. The limitations to frequency stability and accuracy are discussed with emphasis on the problems associated with cavity resonator instability and the lack of reproducibility and stability of the storage volume wall coating frequency shift. New types of coatings developed in the Soviet Union and better, cavity resonator materials, are expected to make possible frequency at the 10-16 level at 10* sec. Better control of systematic effects should extend the long-term stability to levels better than 105 for intervals beyond one day. Present use of H-masers as flywheel oscillators in timekeeping systems is discussed as is the outlook for the future cryogenic and room temperature H-masers as flywheel oscillators to operate very high resolution frequency discriminators based on the newly evolving technology of trapped and cooled ions and atoms.
Published in:	Proceedings of the 22th Annual Precise Time and Time Interval Systems and Applications Meeting December 4 - 6, 1990 Sheraton Premiere Hotel Vienna, Virginia
Pages:	29 - 52
Cite this article:	Vessot, Robert F.C., "STATE OF THE ART AND FUTURE DIRECTIONS FOR THE ATOMIC HYDROGEN MASER," Proceedings of the 22th Annual Precise Time and Time Interval Systems and Applications Meeting, Vienna, Virginia, December 1990, pp. 29-52.
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