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Development of a cryogenic hydrogen maser at the NPLA prototype Cold Hydrogen Maser (CHM) was being developed for the past year. The features of this CHM, which is designed to operate initially at 4.2 K, are the use of low loss alumina, and later sapphire, in the fabrication of the microwave cavity; possible use of superconductors for shielding; use of a cryogenic amplifier; possible coating material; and a reliable RF discharge circuit for the dissociation of hydrogen. A numerical simulation was performed to find the dimensions of the microwave cavity for the TE011 mode and the model was confirmed experimentally. The system will be used to test various wall coatings adsorbed on top of a PTFE buffer underlayer. The CHM is expected to be used as a flywheel frequency standard at the NPL with medium-term stability of one part in 10(exp 14) or better.
Document ID
19940006510
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mossavati, R.
(National Physical Lab. Teddington, United Kingdom)
Date Acquired
August 16, 2013
Publication Date
June 1, 1993
Publication Information
Publication: NASA. Goddard Space Flight Center, The 24th Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting
Subject Category
Lasers And Masers
Accession Number
94N10982
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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