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Testing Lorentz invariance using an asymetric optical resonator 用非对称光学谐振器测试洛伦兹不变性
CPEM 2010 Pub Date : 2010-06-13 DOI: 10.1109/CPEM.2010.5543217
F. Baynes, M. Tobar, A. Luiten
{"title":"Testing Lorentz invariance using an asymetric optical resonator","authors":"F. Baynes, M. Tobar, A. Luiten","doi":"10.1109/CPEM.2010.5543217","DOIUrl":"https://doi.org/10.1109/CPEM.2010.5543217","url":null,"abstract":"Recent experiments utilizing resonant cavities have produced remarkable results that limit the level of any possible violation of Lorentz Invariance. However, within the framework of the Standard Model Extension (SME) one parameter кtr remains significantly under-constrained compared to the other parameters. It has been shown an asymmetric optical resonator will be sensitive to violations of LI and specifically much more sensitive to кtr than conventional resonators. In this experiment such an asymmetric resonator is compared to a linear sapphire cavity with the measurement system is based on a 1064 nm YAG laser locked to the resonances of both cavities.","PeriodicalId":222495,"journal":{"name":"CPEM 2010","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126428400","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}
引用次数: 0
Progress in the evaluation and operation of the NRC strontium single ion frequency standard as an optical atomic clock NRC锶单离子频率标准作为光学原子钟的评价与运行进展
CPEM 2010 Pub Date : 2010-06-13 DOI: 10.1109/CPEM.2010.5544362
A. Madej, P. Dubé, J. Bernard, G. Humphrey, M. Vainio, J. Jiang, D.J. Jones
{"title":"Progress in the evaluation and operation of the NRC strontium single ion frequency standard as an optical atomic clock","authors":"A. Madej, P. Dubé, J. Bernard, G. Humphrey, M. Vainio, J. Jiang, D.J. Jones","doi":"10.1109/CPEM.2010.5544362","DOIUrl":"https://doi.org/10.1109/CPEM.2010.5544362","url":null,"abstract":"Improved functionality and accuracy of the NRC Sr+ single trapped ion 445-THz standard is described. Absolute frequency stabilization of all laser sources has been achieved together with loading of the ion trap using photo-ionization methods. An Erbium fiber laser based frequency comb is used to directly measure the 445-THz clock frequency. A 9 hr preliminary measurement was performed with statistical uncertainty of 1.4 Hz (3×10−15) in excellent agreement with a previously reported value in 2005. A new endcap trap with probing and micromotion correction in three dimensions has been assembled and will have uncertainties approaching 10−17 in the near future.","PeriodicalId":222495,"journal":{"name":"CPEM 2010","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128060216","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}
引用次数: 1
Accumulation of a clock state population by optical pumping in a caesium fountain 铯喷泉中光抽运钟态种群的积累
CPEM 2010 Pub Date : 2010-06-13 DOI: 10.1109/CPEM.2010.5544346
S. Park, K. Szymaniec
{"title":"Accumulation of a clock state population by optical pumping in a caesium fountain","authors":"S. Park, K. Szymaniec","doi":"10.1109/CPEM.2010.5544346","DOIUrl":"https://doi.org/10.1109/CPEM.2010.5544346","url":null,"abstract":"We have implemented a technique of optical pumping (OP) to increase the clock state populations in a caesium fountain frequency standard. Our initial experiments have demonstrated accumulation of 75% of the atoms in the mF = 0 sublevel (clock state), which can be compared to a typical 11% population of this sublevel with no additional OP applied. As the (OP) process requires scattering of some 20 photons per atom, the atomic cloud is heated by nearly 1 µK and the final number of atoms reaching the detector is reduced by up to a factor of two, depending on the molasses temperature. Using the OP technique in the NPL-CsF2 fountain we have observed a four-fold net increase of the clock state population.","PeriodicalId":222495,"journal":{"name":"CPEM 2010","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128089247","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}
引用次数: 2
Development of nanonewton force standard based on a torsion pendulum 基于扭摆的纳米牛顿力标准的研制
CPEM 2010 Pub Date : 2010-06-13 DOI: 10.1109/CPEM.2010.5543636
Sheng-Jui Chen, S. Pan
{"title":"Development of nanonewton force standard based on a torsion pendulum","authors":"Sheng-Jui Chen, S. Pan","doi":"10.1109/CPEM.2010.5543636","DOIUrl":"https://doi.org/10.1109/CPEM.2010.5543636","url":null,"abstract":"This paper introduces the torsion pendulum experiment at center for measurement standards, industrial technology research institute (CMS/ITRI). The torsion pendulum experiment aims at SI traceable measurement and generation of force at nano/subnano-newton scale. Three force generation mechanisms, namely optical force, electrostatic force and universal gravitation are implemented in the experiment. Recent progress on gravitation measurement is reported in this article.","PeriodicalId":222495,"journal":{"name":"CPEM 2010","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127987409","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}
引用次数: 2
Phase comparison of high current shunts up to 100 kHz 高达100khz的大电流分流器的相位比较
CPEM 2010 Pub Date : 2010-06-13 DOI: 10.1109/CPEM.2010.5545149
G. Bosco, M. Garcocz, K. Lind, U. Pogliano, G. Rietveld, V. Tarasso, B. Voljc, V. N. Zachovalova
{"title":"Phase comparison of high current shunts up to 100 kHz","authors":"G. Bosco, M. Garcocz, K. Lind, U. Pogliano, G. Rietveld, V. Tarasso, B. Voljc, V. N. Zachovalova","doi":"10.1109/CPEM.2010.5545149","DOIUrl":"https://doi.org/10.1109/CPEM.2010.5545149","url":null,"abstract":"A comparison of the phase of existing shunts for currents between 10 A and 100 A and frequencies from 500 Hz to 100 kHz has been organized. The measurements were performed at INRIM using a first prototype of a new type of phase comparator and a step-up method for the data processing. The results of the relative measurements have shown a good repeatability, but the method for the evaluation of the reference value still needs some improvement.","PeriodicalId":222495,"journal":{"name":"CPEM 2010","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115802740","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}
引用次数: 4
Impedance measurements with Programmable Josephson Systems 阻抗测量与可编程约瑟夫森系统
CPEM 2010 Pub Date : 2010-06-13 DOI: 10.1109/CPEM.2010.5543389
Jinnie Lee, J. Schurr, J. Nissila, L. Palafox, R. Behr
{"title":"Impedance measurements with Programmable Josephson Systems","authors":"Jinnie Lee, J. Schurr, J. Nissila, L. Palafox, R. Behr","doi":"10.1109/CPEM.2010.5543389","DOIUrl":"https://doi.org/10.1109/CPEM.2010.5543389","url":null,"abstract":"Arbitrary impedance ratios can be determined with high accuracy by means of a programmable Josephson system. For a 1∶1 resistance ratio at 10-kΩ level we demonstrate that the novel system allows measurements over a wide frequency range from 25 Hz to 10 kHz. Uncertainties are in the range of a few parts in 108 and thus comparable to those of conventional impedance bridges.","PeriodicalId":222495,"journal":{"name":"CPEM 2010","volume":"193 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134541228","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}
引用次数: 3
Microwave optimization of 10 V PJVS circuits 10v PJVS电路的微波优化
CPEM 2010 Pub Date : 2010-06-13 DOI: 10.1109/CPEM.2010.5543823
P. Dresselhaus, M. Elsbury, C. Burroughs, S. Benz
{"title":"Microwave optimization of 10 V PJVS circuits","authors":"P. Dresselhaus, M. Elsbury, C. Burroughs, S. Benz","doi":"10.1109/CPEM.2010.5543823","DOIUrl":"https://doi.org/10.1109/CPEM.2010.5543823","url":null,"abstract":"Proper operation of programmable Josephson voltage standard arrays depends on the uniform distribution of microwaves to a large number of Josephson junctions. Too much or too little microwave power will change the current range of a junction's constant voltage step so that an entire array of junctions will have a smaller total current margin. In this paper we discuss the important aspects of microwave power distribution including splitting the microwaves to different arrays, keeping the microwave bias uniform within an array, and minimizing the total input power to the circuit.","PeriodicalId":222495,"journal":{"name":"CPEM 2010","volume":"253 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133929145","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}
引用次数: 2
Laser spectroscopy of muonic hydrogen: New determination of the proton charge radius 介子氢的激光光谱:质子电荷半径的新测定方法
CPEM 2010 Pub Date : 2010-06-13 DOI: 10.1109/CPEM.2010.5543335
F. Nez
{"title":"Laser spectroscopy of muonic hydrogen: New determination of the proton charge radius","authors":"F. Nez","doi":"10.1109/CPEM.2010.5543335","DOIUrl":"https://doi.org/10.1109/CPEM.2010.5543335","url":null,"abstract":"We report on the first laser spectroscopy experiment on muonic hydrogen. We have measured the 2S-2P Lamb shift in muonic hydrogen. A new and unexpected value of the proton root-mean-square charge radius (rp) is deduced from this measurement. This value of rp strongly disagrees with the others determinations either from hydrogen spectroscopy combined with QED calculations or from electron scattering experiments. Our result provides a completely new picture of the comparison between transition energies measurements and QED calculations. This experiment has been realized at Paul Scherrer Institute (Villigen Switzerland) in the frame of the international collaboration CREMA (see references and http://muhy.web.psi.ch ).","PeriodicalId":222495,"journal":{"name":"CPEM 2010","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131494600","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}
引用次数: 0
A fast L-R comparison system by digital sampling measurement approach 采用数字采样测量方法的快速L-R比较系统
CPEM 2010 Pub Date : 2010-06-13 DOI: 10.1109/CPEM.2010.5543218
Yang Yan, Wang Wei, Huang Lu, L. Zu-liang, L. Wenjun
{"title":"A fast L-R comparison system by digital sampling measurement approach","authors":"Yang Yan, Wang Wei, Huang Lu, L. Zu-liang, L. Wenjun","doi":"10.1109/CPEM.2010.5543218","DOIUrl":"https://doi.org/10.1109/CPEM.2010.5543218","url":null,"abstract":"A digital sampling system which can fast compare inductors with ac standard resistors in the frequency range between 20 Hz and 20 kHz is described. It can also precisely measure inductance at heavy current or high voltage. Inductors from 10mH to 10H in the low audio frequency range can be measured with the least relative uncertainty of 50 to 100 parts in 106.","PeriodicalId":222495,"journal":{"name":"CPEM 2010","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131650365","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}
引用次数: 0
Error in calorimetric effective efficiency measurements due to DC losses 由于直流损耗造成的量热有效效率测量误差
CPEM 2010 Pub Date : 2010-06-13 DOI: 10.1109/CPEM.2010.5544171
T. Crowley, B. Riddle
{"title":"Error in calorimetric effective efficiency measurements due to DC losses","authors":"T. Crowley, B. Riddle","doi":"10.1109/CPEM.2010.5544171","DOIUrl":"https://doi.org/10.1109/CPEM.2010.5544171","url":null,"abstract":"DC losses in the four-wire leads or connector of a microwave power transfer standard can result in incorrect effective efficiency measurements as measured by a calorimeter. Symptoms of the error and a method for setting an upper limit of its magnitude are described.","PeriodicalId":222495,"journal":{"name":"CPEM 2010","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132776387","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}
引用次数: 1
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