A Comparison of Cs Fountain Primary Frequency Standards
2008-5-7 the frequency offsets among these standards and to determine whether these offsets are consistent with the stated uncertainties. The results of this investigation show that, overall, the standards agree very well with each other. INTRODUCTION . The first formal evaluation of a cesium fountain primary frequency standard (PFS) was reported to the
A Cesium fountain frequency standard: Preliminary results
1994-12-31 A fountain frequency standard is now in operation at LPTF. A Ramsey resonance as narrow as 0.8 Hz has been obtained. A few days of continuous operation are routinely obtained. In closed loop operation the fountain frequency standard is continuously monitored against a H maser allowing an evaluation of the accuracy of the device.
PROGRESS ON A PORTABLE RUBIDIUM FOUNTAIN
2009-4-2 frequency standards, as well as a measurement tool for the gravitational redshift. Here, we describe the progress made on this project, including our recent observation of a magneto-optical trap (MOT), and the anticipated performance of our transportable Rb fountain frequency standard. INTRODUCTION
Long-term comparison of caesium fountain primary
2009-12-8 the caesium frequency is made using the weighted mean of all the fountains. (Some figures in this article are in colour only in the electronic version) 1. Introduction The first formal evaluation of a caesium fountain primary frequency standard (PFS) was reported to the Bureau International des Poids et Measures (BIPM) by the
PROGRESS ON A PORTABLE RUBIDIUM FOUNTAIN
FOUNTAIN FREQUENCY STANDARD* P. D. Kunz, T. P. Heavner, and S. R. Jefferts Time and Frequency Division National Institute of Standards and Technology 325 Broadway, Boulder, CO 80305, USA E-mail: [email protected], [email protected], [email protected] Abstract We are developing a transportable laser-cooled rubidium (Rb) atomic fountain frequency
First international comparison of fountain primary
uncertainties. The comparison also includes a rubidium fountain frequency standard participating in the steering of TAI and enables a new absolute determination of the 87Rb ground state hyperfine transition frequency with an uncertainty of 3.1×10−16. Metrologia First international comparison of fountain primary frequency standards via a long
Development of cesium fountain frequency standard at
the country's first cesium fountain frequency standard a few years ago. The aim of this entire activity is to build a primary frequency standard for India with a relative un certainty better than 1 x 1CT15. The NPLI fountain has a (0, 0, 1) geometry of the magneto-optical trap (MOT) for cooling and launching operations.
Operation of caesium fountain frequency standards with
using corrections provided by an atomic fountain frequency standard [12, ]. The microwave source used in the fountain to interrogate the atomic absorbers (local oscillator, LO) is usually weakly phase-locked (i.e. with a time constant of up Metrologia Operation of caesium fountain frequency standards with remote hydrogen maser references
The MTsR-F2 fountain-type cesium frequency standard
2012-12-21 The design and metrological characteristics of the MTsR-F2 fountain-type cesium frequency standard developed at the All-Russia Research Institute of Physicotechnical and Radio Measurements in 2008–2011 within the framework of the GLONASS Federal Targeted Program are presented.
Quantum Projection Noise in an Atomic Fountain: A High
2012-5-3 In a frequency standard such as an atomic fountain, the population of jgl (and/or jel)is measured as a function of the frequency of an external interrogation field, and this information is used to lock the standards output frequency to the atomic transition frequency. As
Cesium fountain frequency standards National Physical
2021-7-4 The first cesium atomic fountain (India-CsF1) frequency standard is now completely assembled and operational. The CsF1 fountain has a (0, 0, 1) geometry of the magneto-optical trap (MOT) for cooling and launching operations. In this geometry, four out of the six cooling beams are in horizontal plane and other are going up and down, respectively
Development of cesium fountain frequency standard at
2012-11-26 the country’s first cesium fountain frequency standard a few years ago. The aim of this entire activity is to build a primary frequency standard for India with a relative un-certainty better than 1 × 10–15. The NPLI fountain has a (0, 0, 1) geometry of the magneto-optical trap (MOT) for cooling and launching operations.
ACCURACY EVALUATION OF A CESIUM FOUNTAIN
2007-2-8 ACCURACY EVALUATION OF A CESIUM FOUNTAIN PRIMARY FREQUENCY STANDARD AT NIST D.M. Meekhof, S.R. Jefferts, J.H. Shirley and T.E. Parker Time and Frequency Division National Institute of Standards and Technology 325 Broadway Boulder, CO 80303 U.S.A Abstract Since November of 1998, we have performed five frequency uncertainty evaluations on NTST F-1,
(PDF) Accurate rubidium atomic fountain frequency standard
fountain frequency standard Metrologia 48 87–100 [2] Li R and Gibble K 2004 Phase variations in microwave. cavities for atomic clocks Metrologia 41 376–86 [3]
Accuracy evaluation of a cesium fountain primary
2001-9-17 MEEKHOF et al.: ACCURACY EVALUATION OF Cs FOUNTAIN PRIMARY FREQUENCY STANDARD 509 TABLE I SUMMARY OF BIASES AND UNCERTAINTIES:TYPICAL EVALUATION Fig. 2. Comparison of six primary frequency standards versus AT1E. be related to international atomic time (TAI). To reached the de-sired statistical uncertainty, the fountain must be run for many days.
PROGRESS IN BUILDING OF CESIUM FOUNTAIN
2021-3-19 cesium fountain frequency standard is highest among any other measurement device currently available. Such atomic fountains are being developed at several laboratories around the world [2-3] and a few of them operate as primary frequency standards. At NPLI we have started developing a cesium fountain clock a few years back.
Evaluation of PTB primary caesium fountain frequency
2021-7-28 Evaluation of PTB primary caesium fountain frequency standard CSF2 between MJD 59394 MJD 59419 PTB's primary caesium fountain frequency standard CSF2 was operated between MJD 59394, 0:00 UTC and MJD 59419, 0:00 UTC. Frequency comparisons were made with respect to PTB hydrogen maser H9, BIPM code 1400509.
Quantum Projection Noise in an Atomic Fountain: A High
2012-5-3 In a frequency standard such as an atomic fountain, the population of jgl (and/or jel)is measured as a function of the frequency of an external interrogation field, and this information is used to lock the standards output frequency to the atomic transition frequency. As
Progress towards primary frequency standard
2015-7-11 The cesium fountain clock as primary frequency standard is widely used in the areas, such as time-keeping system, satellite navigation, fundamental physics research, etc. The principle of operation of cesium fountain clock is introduced. The noise source and frequency shift term are ananlyzed. The major noise source influencing frequency stability are cold atom loading time,
An electronic sequence controller for the Cs fountain
2015-11-1 The sequence control system for Cs atomic fountain clock is described in this paper. An electronic module to control the operational sequence of the Cesium (Cs) fountain frequency standard has been designed and developed. This control system consists of RF generation for AOMs and provides sequential control for cyclic operation of atomic fountain.
PROGRESS ON A PORTABLE RUBIDIUM FOUNTAIN
FOUNTAIN FREQUENCY STANDARD* P. D. Kunz, T. P. Heavner, and S. R. Jefferts Time and Frequency Division National Institute of Standards and Technology 325 Broadway, Boulder, CO 80305, USA E-mail: [email protected], [email protected], [email protected] Abstract We are developing a transportable laser-cooled rubidium (Rb) atomic fountain frequency
Accuracy evaluation of a cesium fountain primary
2001-9-17 MEEKHOF et al.: ACCURACY EVALUATION OF Cs FOUNTAIN PRIMARY FREQUENCY STANDARD 509 TABLE I SUMMARY OF BIASES AND UNCERTAINTIES:TYPICAL EVALUATION Fig. 2. Comparison of six primary frequency standards versus AT1E. be related to international atomic time (TAI). To reached the de-sired statistical uncertainty, the fountain must be run for many days.
Development of cesium fountain frequency standard at
the country's first cesium fountain frequency standard a few years ago. The aim of this entire activity is to build a primary frequency standard for India with a relative un certainty better than 1 x 1CT15. The NPLI fountain has a (0, 0, 1) geometry of the magneto-optical trap (MOT) for cooling and launching operations.
ACCURACY EVALUATION OF A CESIUM FOUNTAIN
2007-2-8 ACCURACY EVALUATION OF A CESIUM FOUNTAIN PRIMARY FREQUENCY STANDARD AT NIST D.M. Meekhof, S.R. Jefferts, J.H. Shirley and T.E. Parker Time and Frequency Division National Institute of Standards and Technology 325 Broadway Boulder, CO 80303 U.S.A Abstract Since November of 1998, we have performed five frequency uncertainty evaluations on NTST F-1,
OSA Laser-cooled Cs-fountain frequency standard
A frequency standard based on an atomic fountain of cesium atoms may have an accuracy of 10−16 because of the longer interaction times and smaller anticipated systematic errors.1 All of the known systematic effects that now limit the accuracy of the Cs frequency standard increase either linearly or as some higher power of the atom’s velocity.
PROGRESS IN BUILDING OF CESIUM FOUNTAIN
2021-3-19 cesium fountain frequency standard is highest among any other measurement device currently available. Such atomic fountains are being developed at several laboratories around the world [2-3] and a few of them operate as primary frequency standards. At NPLI we have started developing a cesium fountain clock a few years back.
Atomic Frequency Standards Group Cs fountain primary
Cs fountain primary standard INR i M is one of the seven metrology laboratories that contribute to the calibration of the International Atomic Time (TAI) with primary frequency standards. The first Italian Cs fountain, ITCsF1, has been operating since 2003 with an accuracy of 5E-16.
Time and Frequency Technology Related to the
The operation of a cesium fountain primary frequency standard is greatly facilitated by the presence of two other important capabilities. The first is a stable frequency reference and the second is one or more high-stability frequency-transfer systems. A stable frequency reference
Progress towards primary frequency standard
2015-7-11 The cesium fountain clock as primary frequency standard is widely used in the areas, such as time-keeping system, satellite navigation, fundamental physics research, etc. The principle of operation of cesium fountain clock is introduced. The noise source and frequency shift term are ananlyzed. The major noise source influencing frequency stability are cold atom loading time,
GNSS-grade space atomic frequency standards: Current
2020-9-18 1. Introduction. Since the first demonstration of an atomic frequency standard (AFS) (Essen and Parry, 1955) and the following redefinition of the SI second in 1967, AFSs have found a multitude of applications (Maleki and Prestage, 2005), both on ground as well as in space.Primary frequency standards directly interrogate the unperturbed Cesium (Cs) 133 ground state hyperfine transition
