Distributed cavity phase frequency shifts of the caesium fountain PTB-CSF2

2011/10/12 by S. Weyers, S Weyers, V Gerginov +7 · 79 citations
Engineering · Physics and Astronomy · #Advanced Frequency and Time Standards #Advanced Measurement and Metrology Techniques #Atomic and Molecular Physics #Caesium #Fountain #Frequency dependence #Frequency drift #Frequency standard #Measurement uncertainty #Microwave #Microwave cavity #Phase (matter) #physics.atom-ph #quant-ph

paper · pdf · doi:10.1088/0026-1394/49/1/012

published in Metrologia 49(1), 82-87 (IOP Publishing) · 15 pages, 5 figures, to be published in Metrologia

arxiv created 2011/10/12 · openalex publication_date 2011/11/28 · openalex created_date 2016/06/24 · arxiv updated 2018/10/22 · openalex updated_date 2026/08/05

Abstract

We evaluate the frequency error from distributed cavity phase in the caesium fountain clock PTB-CSF2 at the Physikalisch-Technische Bundesanstalt with a combination of frequency measurements and ab initio calculations. The associated uncertainty is 1.3 × 10 −16 , with a frequency bias of 0.4 × 10 −16 . The agreement between the measurements and calculations explains the previously observed frequency shifts at elevated microwave amplitude. We also evaluate the frequency bias and uncertainty due to the microwave lensing of the atomic wave packets. We report a total PTB-CSF2 systematic uncertainty of 4.1 × 10 −16 .

Citations

• Improved accuracy of the NPL-CsF2 primary frequency standard: evaluation of distributed cavity phase and microwave lensing frequency shifts

Cited by

• Optical Stabilization of a Microwave Oscillator for Fountain Clock Interrogation
• Advances in the accuracy, stability, and reliability of the PTB primary fountain clocks
• Phase Analysis for Frequency Standards in the Microwave and Optical Domains