Pub Date : 2010-06-01DOI: 10.1109/FREQ.2010.5556338
M. Rocha-Gaso, R. Fernández-Díaz, A. Arnau-Vives, C. March-Iborra
The present paper describes a novel approach to evaluate the mass sensitivity of a Love wave (LW) sensor. A ZnO/XY LiNbO3 delay line based device with a sensing film was modeled and simulated applying the 3D- Finite Element Method (FEM). The radio frequency signal delays due to the thickness changes induced to the sensing film were registered and measured at the output Interdigital Transducer (IDT). The time delays were associated with phase shifts to determine the phase sensitivity of the sensor. A phase sensitivity of 600 [cm2/g] was obtained, which is in good agreement with literature.
{"title":"Mass sensitivity evaluation of a Love wave sensor using the 3D Finite Element Method","authors":"M. Rocha-Gaso, R. Fernández-Díaz, A. Arnau-Vives, C. March-Iborra","doi":"10.1109/FREQ.2010.5556338","DOIUrl":"https://doi.org/10.1109/FREQ.2010.5556338","url":null,"abstract":"The present paper describes a novel approach to evaluate the mass sensitivity of a Love wave (LW) sensor. A ZnO/XY LiNbO3 delay line based device with a sensing film was modeled and simulated applying the 3D- Finite Element Method (FEM). The radio frequency signal delays due to the thickness changes induced to the sensing film were registered and measured at the output Interdigital Transducer (IDT). The time delays were associated with phase shifts to determine the phase sensitivity of the sensor. A phase sensitivity of 600 [cm2/g] was obtained, which is in good agreement with literature.","PeriodicalId":344989,"journal":{"name":"2010 IEEE International Frequency Control Symposium","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124921821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-06-01DOI: 10.1109/FREQ.2010.5556276
S. Mohammadi, A. Eftekhar, A. Adibi
Phononic crystals (PnCs) are inhomogeneous materials with periodic variations in their elastic (or acoustic) properties. PnCs, if properly designed, can show frequency ranges in which the propagation of elastic waves is completely prohibited. Within these frequency ranges, called complete phononic band gaps (CPnBGs), elastic energy can be confined and manipulated by the PnC structure. Micro-machined PnC structures with two-dimensional (2D) periodicities and finite thicknesses have been developed to possess large CPnBGs. Such structures have shown to be very effective in confining mechanical vibrations at very high frequencies. It is argued that by replacing the supporting structure of the suspended conventional high-Q micro/nano-mechanical (MM) resonators with PnC structures, the support loss in the resonators can be suppressed. However, a such resonators may give rise to spurious modes in the resonance profile of the resonance. Therefore, the development of more efficient PnC resonators with complete elimination of the supporting structures in all in-plane directions and with large spurious-fee spectral ranges is pending. In this paper we discuss different architectures and properties of support-loss-free PnC micro-mechanical resonators and compare their performance with the conventional MM bar resonators with supporting anchors. We have recently shown that in a thin-film piezoelectric on substrate (TPoS) MM resonator, the quality factor can be greatly improved by replacing the supporting structure with PnC structures. Qs of more than 6,000 are obtained at very high frequencies (∼130 MHz) for the case of PnC resonators compared to Qs the order of about 1,000 for the structures with support. It is though observed that the PnC structure in such resonators may lead to undesirable spurious modes around the main resonant mode. In order to mitigate the spurious modes, in this paper PnC waveguides are engineered and designed to form more effective PnC resonators. Waveguide-based PnC resonators with Qs of more than 7,000 and with a large free spectral range around the resonant mode are hence developed.
{"title":"Support loss-free micro/nano-mechanical resonators using phononic crystal slab waveguides","authors":"S. Mohammadi, A. Eftekhar, A. Adibi","doi":"10.1109/FREQ.2010.5556276","DOIUrl":"https://doi.org/10.1109/FREQ.2010.5556276","url":null,"abstract":"Phononic crystals (PnCs) are inhomogeneous materials with periodic variations in their elastic (or acoustic) properties. PnCs, if properly designed, can show frequency ranges in which the propagation of elastic waves is completely prohibited. Within these frequency ranges, called complete phononic band gaps (CPnBGs), elastic energy can be confined and manipulated by the PnC structure. Micro-machined PnC structures with two-dimensional (2D) periodicities and finite thicknesses have been developed to possess large CPnBGs. Such structures have shown to be very effective in confining mechanical vibrations at very high frequencies. It is argued that by replacing the supporting structure of the suspended conventional high-Q micro/nano-mechanical (MM) resonators with PnC structures, the support loss in the resonators can be suppressed. However, a such resonators may give rise to spurious modes in the resonance profile of the resonance. Therefore, the development of more efficient PnC resonators with complete elimination of the supporting structures in all in-plane directions and with large spurious-fee spectral ranges is pending. In this paper we discuss different architectures and properties of support-loss-free PnC micro-mechanical resonators and compare their performance with the conventional MM bar resonators with supporting anchors. We have recently shown that in a thin-film piezoelectric on substrate (TPoS) MM resonator, the quality factor can be greatly improved by replacing the supporting structure with PnC structures. Qs of more than 6,000 are obtained at very high frequencies (∼130 MHz) for the case of PnC resonators compared to Qs the order of about 1,000 for the structures with support. It is though observed that the PnC structure in such resonators may lead to undesirable spurious modes around the main resonant mode. In order to mitigate the spurious modes, in this paper PnC waveguides are engineered and designed to form more effective PnC resonators. Waveguide-based PnC resonators with Qs of more than 7,000 and with a large free spectral range around the resonant mode are hence developed.","PeriodicalId":344989,"journal":{"name":"2010 IEEE International Frequency Control Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128941021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-06-01DOI: 10.1109/FREQ.2010.5556371
P. Dubé, A. Madej, J. Bernard, G. Humphrey, M. Vainio, J. Jiang, D.J. Jones
We report our recent progress made with the NRC 88Sr+ single-ion optical frequency standard. The long-term operation of the standard was improved by actively stabilizing the cooling, repump and clearout laser sources, and by using a femtosecond fiber laser frequency comb to link the probe laser frequency to the microwave time standards. With the femtosecond fiber comb, we have demonstrated continuous operation for a period of eight days and continuous measurement of the probe laser source for three days. Micromotion shifts have been the dominant source of uncertainty in our rf Paul trap because laser beam access is only possible along one axis in the current design. With the aim of reducing to a minimum these shifts, we have constructed an endcap trap designed for minimization of micromotion along three orthogonal axes. We report on the successful trapping of single ions with this endcap trap. Since electrode contamination during trap loading can also induce micromotion shifts as a result of evolving patch potentials, we have increased the trap loading efficiency with photo-ionization.
{"title":"Recent progress on the NRC 88Sr+ single-ion optical frequency standard","authors":"P. Dubé, A. Madej, J. Bernard, G. Humphrey, M. Vainio, J. Jiang, D.J. Jones","doi":"10.1109/FREQ.2010.5556371","DOIUrl":"https://doi.org/10.1109/FREQ.2010.5556371","url":null,"abstract":"We report our recent progress made with the NRC 88Sr+ single-ion optical frequency standard. The long-term operation of the standard was improved by actively stabilizing the cooling, repump and clearout laser sources, and by using a femtosecond fiber laser frequency comb to link the probe laser frequency to the microwave time standards. With the femtosecond fiber comb, we have demonstrated continuous operation for a period of eight days and continuous measurement of the probe laser source for three days. Micromotion shifts have been the dominant source of uncertainty in our rf Paul trap because laser beam access is only possible along one axis in the current design. With the aim of reducing to a minimum these shifts, we have constructed an endcap trap designed for minimization of micromotion along three orthogonal axes. We report on the successful trapping of single ions with this endcap trap. Since electrode contamination during trap loading can also induce micromotion shifts as a result of evolving patch potentials, we have increased the trap loading efficiency with photo-ionization.","PeriodicalId":344989,"journal":{"name":"2010 IEEE International Frequency Control Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129077959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-06-01DOI: 10.1109/FREQ.2010.5556283
D. Felbach, F. Soualle, L. Stopfkuchen, A. Zenzinger
All signal generation and transmission frequencies in the payload of a navigation satellite are typically derived from a single 10.23 MHz master clock. In case of the current payload architecture of the Galileo or other Navigation System this Master Timing Reference (MTR) is synthesized in a Clock Monitoring and Control Unit (CMCU) based on one single atomic reference. To achieve this, in the current Galileo design the CMCU selects the active clock from a pool of two Rubidium Atomic Frequency Standards (RAFS) and two Passive H-Masers (PHM) and synthesizes the MTR from this source. A second atomic clock is kept in hot redundancy and monitored inside the CMCU for its phase drift against the active clock.
{"title":"Clock monitoring and control units for navigation satellites","authors":"D. Felbach, F. Soualle, L. Stopfkuchen, A. Zenzinger","doi":"10.1109/FREQ.2010.5556283","DOIUrl":"https://doi.org/10.1109/FREQ.2010.5556283","url":null,"abstract":"All signal generation and transmission frequencies in the payload of a navigation satellite are typically derived from a single 10.23 MHz master clock. In case of the current payload architecture of the Galileo or other Navigation System this Master Timing Reference (MTR) is synthesized in a Clock Monitoring and Control Unit (CMCU) based on one single atomic reference. To achieve this, in the current Galileo design the CMCU selects the active clock from a pool of two Rubidium Atomic Frequency Standards (RAFS) and two Passive H-Masers (PHM) and synthesizes the MTR from this source. A second atomic clock is kept in hot redundancy and monitored inside the CMCU for its phase drift against the active clock.","PeriodicalId":344989,"journal":{"name":"2010 IEEE International Frequency Control Symposium","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129166671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-06-01DOI: 10.1109/FREQ.2010.5556275
Tsung-Tsong Wu, Jia-Hong Sun
This paper presents simulation, design and fabrication of surface acoustic wave (SAW) and Lamb wave micro-phononic devices. To illustrate the band gap formation and possible applications, numerical simulations on the air/silicon phononic crystals (PCs) were conducted which include: surface acoustic waves (SAWs) in a half-space and Lamb waves in a plate. With a lattice constant of 20 µm and high filling fraction, complete band gaps in the range of hundred MHz were found. Based on the band gap properties, numerical simulations on the point defects, waveguides and cavities in PC plates were then performed and discussed. On the experimental side, the associated micro acoustic resonators for both SAW and Lamb waves are demonstrated. Results on the fabrication and measurements of the silicon based micro-PC devices in the hundred MHz ranges are encouraging and may find potential applications in the areas of wireless filters.
{"title":"Band gap materials and micro-phononic devices","authors":"Tsung-Tsong Wu, Jia-Hong Sun","doi":"10.1109/FREQ.2010.5556275","DOIUrl":"https://doi.org/10.1109/FREQ.2010.5556275","url":null,"abstract":"This paper presents simulation, design and fabrication of surface acoustic wave (SAW) and Lamb wave micro-phononic devices. To illustrate the band gap formation and possible applications, numerical simulations on the air/silicon phononic crystals (PCs) were conducted which include: surface acoustic waves (SAWs) in a half-space and Lamb waves in a plate. With a lattice constant of 20 µm and high filling fraction, complete band gaps in the range of hundred MHz were found. Based on the band gap properties, numerical simulations on the point defects, waveguides and cavities in PC plates were then performed and discussed. On the experimental side, the associated micro acoustic resonators for both SAW and Lamb waves are demonstrated. Results on the fabrication and measurements of the silicon based micro-PC devices in the hundred MHz ranges are encouraging and may find potential applications in the areas of wireless filters.","PeriodicalId":344989,"journal":{"name":"2010 IEEE International Frequency Control Symposium","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129180598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-06-01DOI: 10.1109/FREQ.2010.5556346
U. Rohde, A. Poddar
In this paper tunable active inductor (TAI) based oscillator topologies are presented. The reported TAI oscillator circuit uses dynamic phase-injection and feed-forward mechanism for improving the phase noise performance and dynamic ranges. The measured phase noise for carrier frequency 11.8 GHz is better than −110dBc/Hz at 1MHz offset with 200 MHz tuning and DC bias of 3V, 30 mA.
{"title":"Tunable active inductor oscillator","authors":"U. Rohde, A. Poddar","doi":"10.1109/FREQ.2010.5556346","DOIUrl":"https://doi.org/10.1109/FREQ.2010.5556346","url":null,"abstract":"In this paper tunable active inductor (TAI) based oscillator topologies are presented. The reported TAI oscillator circuit uses dynamic phase-injection and feed-forward mechanism for improving the phase noise performance and dynamic ranges. The measured phase noise for carrier frequency 11.8 GHz is better than −110dBc/Hz at 1MHz offset with 200 MHz tuning and DC bias of 3V, 30 mA.","PeriodicalId":344989,"journal":{"name":"2010 IEEE International Frequency Control Symposium","volume":"16 5-6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120915380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-06-01DOI: 10.1109/FREQ.2010.5556347
Y. Le Coq, W. Zhang, J. Millo, M. Lours, A. Luiten, G. Santarelli, Z. Xu, R. Boudot, P. Bourgeois, Y. Kersalé
We present our results on optical to microwave frequency division by fiber-based optical frequency combs. The phase noise added by the division process is characterized and several noise reduction strategies are demonstrated. We reach −123dBc/Hz at 1Hz from a 11.55GHz carrier and about −130dBc/Hz above 200Hz Fourier frequency. The fractional frequency stability scales as 1.1×10−16τ−1T where t is the averaging time in seconds. We demonstrate optics to microwave synchronization stability below 100 attoseconds from 1s to 1000s timescale
{"title":"Optics to microwave low phase noise frequency division : Synchronization with stability below 100 attoseconds","authors":"Y. Le Coq, W. Zhang, J. Millo, M. Lours, A. Luiten, G. Santarelli, Z. Xu, R. Boudot, P. Bourgeois, Y. Kersalé","doi":"10.1109/FREQ.2010.5556347","DOIUrl":"https://doi.org/10.1109/FREQ.2010.5556347","url":null,"abstract":"We present our results on optical to microwave frequency division by fiber-based optical frequency combs. The phase noise added by the division process is characterized and several noise reduction strategies are demonstrated. We reach −123dBc/Hz at 1Hz from a 11.55GHz carrier and about −130dBc/Hz above 200Hz Fourier frequency. The fractional frequency stability scales as 1.1×10<sup>−16</sup>τ<sup>−1</sup>T where t is the averaging time in seconds. We demonstrate optics to microwave synchronization stability below 100 attoseconds from 1s to 1000s timescale","PeriodicalId":344989,"journal":{"name":"2010 IEEE International Frequency Control Symposium","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132060113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-06-01DOI: 10.1109/FREQ.2010.5556266
F. Kartner, Jungwon Kim, J. Cox, Jeff Chen, A. Nejadmalayeri
Future accelerators and Light Sources, such as X-ray free-electron lasers (FELs) require femtosecond and potentially attosecond timing accuracy between electron beams and optical lasers for improved FEL performance and to study the spatio-temporal dynamics of ultrafast processes on atomic and molecular scales. In this paper, we present a set of new ultrafast optical techniques and devices that have been developed over the last five years for long-term stable femtosecond synchronization of large-scale X-ray FELs. These techniques are based on the availability of ultra-low timing jitter optical pulse trains available from mode-locked lasers that serve as timing signals to be distributed via timing-stabilized fiber links to end-stations where tight synchronization is required. At the end-stations, optical and RF sub-systems are synchronized with the delivered timing signals. Using these techniques, we demonstrate experimentally that remotely located lasers and microwave sources in facilities, a few hundred meters in extent, can be synchronized with few femtosecond accuracy over typical uninterrupted operating periods of FELs, i.e. > 10 hours. The limitation to femtosecond accuracy is due to the quantum noise of currently employed femtosecond fiber lasers and can be overcome in the future, with improved noise performance of femtosecond lasers.
{"title":"Femtosecond precision timing distribution for accelerators and Light Sources","authors":"F. Kartner, Jungwon Kim, J. Cox, Jeff Chen, A. Nejadmalayeri","doi":"10.1109/FREQ.2010.5556266","DOIUrl":"https://doi.org/10.1109/FREQ.2010.5556266","url":null,"abstract":"Future accelerators and Light Sources, such as X-ray free-electron lasers (FELs) require femtosecond and potentially attosecond timing accuracy between electron beams and optical lasers for improved FEL performance and to study the spatio-temporal dynamics of ultrafast processes on atomic and molecular scales. In this paper, we present a set of new ultrafast optical techniques and devices that have been developed over the last five years for long-term stable femtosecond synchronization of large-scale X-ray FELs. These techniques are based on the availability of ultra-low timing jitter optical pulse trains available from mode-locked lasers that serve as timing signals to be distributed via timing-stabilized fiber links to end-stations where tight synchronization is required. At the end-stations, optical and RF sub-systems are synchronized with the delivered timing signals. Using these techniques, we demonstrate experimentally that remotely located lasers and microwave sources in facilities, a few hundred meters in extent, can be synchronized with few femtosecond accuracy over typical uninterrupted operating periods of FELs, i.e. > 10 hours. The limitation to femtosecond accuracy is due to the quantum noise of currently employed femtosecond fiber lasers and can be overcome in the future, with improved noise performance of femtosecond lasers.","PeriodicalId":344989,"journal":{"name":"2010 IEEE International Frequency Control Symposium","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133986117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-06-01DOI: 10.1109/FREQ.2010.5556300
J. Munoz-Gamarra, E. Marigó, J. Giner, A. Uranga, F. Torres, N. Barniol
Experimental results of a pulsed mode electrostatic excitation on a Double Ended Tunning Fork (DETF) MEMS resonator at 11 MHz fabricated on a commercial standard 0.35um CMOS technology are described. Using small pulse widths of 4 ns, a ten percent power safe and a reduction of the MEMS non-linearities are achieved.
{"title":"Characterization of CMOS-MEMS resonator by pulsed mode electrostatic actuation","authors":"J. Munoz-Gamarra, E. Marigó, J. Giner, A. Uranga, F. Torres, N. Barniol","doi":"10.1109/FREQ.2010.5556300","DOIUrl":"https://doi.org/10.1109/FREQ.2010.5556300","url":null,"abstract":"Experimental results of a pulsed mode electrostatic excitation on a Double Ended Tunning Fork (DETF) MEMS resonator at 11 MHz fabricated on a commercial standard 0.35um CMOS technology are described. Using small pulse widths of 4 ns, a ten percent power safe and a reduction of the MEMS non-linearities are achieved.","PeriodicalId":344989,"journal":{"name":"2010 IEEE International Frequency Control Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131167553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-06-01DOI: 10.1109/FREQ.2010.5556322
L. Marmet, M. Gertsvolf
An uncertainty evaluation of NRC's cesium fountain clock FCs1 is currently being performed. One task of this evaluation consists in quantifying the contribution to the frequency uncertainty, the second-order Zeeman shift. We report the results obtained from measurements of the C-field above the Ramsey cavity using the Larmor frequency as a probe. This technique is possible because a transverse C-field is used in NRC-FCs1 and alignment electrodes are available to produce an orthogonal excitation field. The non-uniformity of the C-field near the Ramsey cavity and the uncertainties in the measurements produce the largest contribution to the type-B uncertainty.
{"title":"Evaluation of NRC-FCs1: Mapping the C-field using the Larmor frequency","authors":"L. Marmet, M. Gertsvolf","doi":"10.1109/FREQ.2010.5556322","DOIUrl":"https://doi.org/10.1109/FREQ.2010.5556322","url":null,"abstract":"An uncertainty evaluation of NRC's cesium fountain clock FCs1 is currently being performed. One task of this evaluation consists in quantifying the contribution to the frequency uncertainty, the second-order Zeeman shift. We report the results obtained from measurements of the C-field above the Ramsey cavity using the Larmor frequency as a probe. This technique is possible because a transverse C-field is used in NRC-FCs1 and alignment electrodes are available to produce an orthogonal excitation field. The non-uniformity of the C-field near the Ramsey cavity and the uncertainties in the measurements produce the largest contribution to the type-B uncertainty.","PeriodicalId":344989,"journal":{"name":"2010 IEEE International Frequency Control Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131282115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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