The USNO rubidium fountains
| Autor: | Christopher R. Ekstrom, Steven Peil, Thomas B. Swanson, Jennifer Taylor, James L. Hanssen |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
History Atomic Physics (physics.atom-ph) chemistry.chemical_element Astronomy FOS: Physical sciences 01 natural sciences Computer Science Applications Education Rubidium Physics - Atomic Physics 010309 optics chemistry Observatory 0103 physical sciences Noise level 010306 general physics Fountain Gravitational redshift |
| DOI: | 10.48550/arxiv.1607.06776 |
| Popis: | Four rubidium fountains at the U.S. Naval Observatory (USNO) have been in operation for 4.5 years. Each fountain has demonstrated periods of stability marked by Total or Theo deviation below 10^-16. Occasional frequency changes, on order of 1.5 times per year per fountain, introduce deviations from white-frequency noise behavior. Averaged together, the four fountains form an ensemble with a white-frequency noise level of 10^-13 and excellent long-term stability as compared to the primary frequency standards contributing to TAI. Progress on using the clocks at USNO for improving limits on coupling of fundamental constants to gravity by measuring the universality of the gravitational redshift for different types of clocks is discussed. Comment: 8th Symposium on Frequency Standards and Metrology 2015 |
| Databáze: | OpenAIRE |
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