frequency standard fountain

frequency standard fountain

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.

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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

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Atomic fountain frequency standard: principle and

The principle and development of fountain frequency standard are introduced in this paper. Fountain frequency standard is an atomic clock technology developed in recent 20 years.

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Development of the cesium fountain frequency standard

2014-6-26  Abstract: We have made much progress on NMIJ-F2, which is our second cesium fountain frequency standard aiming an uncertainty of ; 1×10 -15 as an immediate goal. The frequency stability is improved to 8.3×10 -14 τ -1/2 (τ: averaging time) by applying a cryogenic sapphire oscillator using a pulse-tube cryocooler as a local oscillator and optically pumping the atoms to the Zeeman sublevel mF

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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

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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

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Endcaps for TE01 Cavities in Fountain Frequency Standards

Ramsey interrogation in cesium fountain primary frequency standards is a cylindrical cavity running in the TE01 mode at 9.192 GHz [1,2,3]. The design of this type of cavity is relatively straightforward, but as fountain frequency standards have pushed to the 10-15 level of absolute frequency inaccuracy the details of the cavity design have become

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Long-term comparison of caesium fountain primary

2020-7-5  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

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Caesium fountain NPL

This enables frequency measurement precision equivalent to less than 1 part in 10 13 for one second of averaging time. The long-term accuracy of this fountain standard is at parts in 10 16, limited by uncertainty of systematic frequency shifts, such as perturbations by stray external fields. Key facts and data Don’t see what you are looking for?

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Evaluation of PTB primary caesium fountain frequency

2021-7-9  Evaluation of PTB primary caesium fountain frequency standard CSF2 between MJD 59364 MJD 59394 PTB's primary caesium fountain frequency standard CSF2 was operated between MJD 59364, 0:00 UTC and MJD 59394, 0:00 UTC. Frequency comparisons were made with respect to PTB hydrogen maser H9, BIPM code 1400509.

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Development of the cesium fountain frequency standard

2014-6-26  Abstract: We have made much progress on NMIJ-F2, which is our second cesium fountain frequency standard aiming an uncertainty of ; 1×10 -15 as an immediate goal. The frequency stability is improved to 8.3×10 -14 τ -1/2 (τ: averaging time) by applying a cryogenic sapphire oscillator using a pulse-tube cryocooler as a local oscillator and optically pumping the atoms to the Zeeman sublevel mF

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NIST-F1 Cesium Fountain Atomic Clock NIST

2009-8-26  The Primary Time and Frequency Standard for the United States. NIST-F1, the nation's primary time and frequency standard, is a cesium fountain atomic clock developed at the NIST laboratories in Boulder, Colorado. NIST-F1 contributes to the

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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

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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.

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Frequency standard using an atomic fountain of optically

Frequency standard using an atomic fountain of optically trapped atoms . United States Patent 5338930 . Abstract: Beams of laser light trap and cool cesium atoms in a small vapor cell and put the atoms in a particular quantum mechanical state. The lasers are then configured so as to launch the atoms upward by shifting the frequencies of the

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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.

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Endcaps for TE01 Cavities in Fountain Frequency Standards

Ramsey interrogation in cesium fountain primary frequency standards is a cylindrical cavity running in the TE01 mode at 9.192 GHz [1,2,3]. The design of this type of cavity is relatively straightforward, but as fountain frequency standards have pushed to the 10-15 level of absolute frequency inaccuracy the details of the cavity design have become

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Evaluation of PTB primary caesium fountain frequency

2021-7-9  PTB's primary caesium fountain frequency standard CSF1 was operated between MJD 59364, 0:00 UTC and MJD 59394, 0:00 UTC. Frequency comparisons were made with respect to PTB hydrogen maser H9, BIPM code 1400509. The relative frequency instability of the relative frequency differences y(CSF1-H9) was 10.7 10-14 ( /s)-1/2 during the 30 days. The

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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.

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PROGRESS ON A PORTABLE RUBIDIUM FOUNTAIN

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 standard.

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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

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Development of cesium fountain frequency standard at

2018-8-17  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

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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.

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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

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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

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A Comparison of Cs Fountain Primary Frequency Standards

2008-4-23  Abstract. There are currently 9 cesium fountain primary frequency standards reporting calibrations of TAI to the Bureau International des Poids et Measures (BIPM). An investigation has been carried out using data from the BIPM publication Circular T to evaluate the frequency offsets among these standards and to determine if these offsets are

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Performance of the PARCS Testbed Cesium Fountain Frequency

2004-8-24  A cesium fountain frequency standard has been developed as a ground testbed for the PARCS (Primary Atomic Reference Clock in Space) experiment, an experiment intended to fly on the International Space Station. We report on the performance of the fountain and describe some of the implementations motivated in large part by flight considerations, but of relevance for ground fountains.

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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.

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Systematic Uncertainty Evaluation of the Cesium Fountain

2016-11-8  CSIR-NPL, India (NPLI) has developed its first Cesium atomic fountain (NPLI-CsF1). The indigenously developed fountain frequency standard is now fully operational and its frequency is now being evaluated along with all systematic and statistical uncertainties. Seven frequency evaluations have been recently conducted to estimate fountain frequency

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NIST Cesium Fountain Frequency Standard: Preliminary

1998-1-1  A locked padlock) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

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