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Topic Area: Physics

Displaying records 21 to 30 of 642 records.
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21. High Bandwidth Optical Magnetometer
Topic: Physics
Published: 11/28/2012
Authors: Ricardo Jimenez Martinez, William C. Griffith, Svenja A Knappe, John E Kitching, Mark Prouty
Abstract: We demonstrate a scalar 87Rb optical magnetometer that retains magnetic eld sensitivities below 10 pT/{square root}Hz over 3dB bandwidths of 10 kHz in an ambient eld Bo = 11.4 microT and using a measurement volume of 1 mm^u3^. The magnetometer operat ...
http://nist.gov/manuscript-publication-search.cfm?pub_id=910335

22. A COLD-ATOM CLOCK BASED ON COHERENT POPULATION TRAPPING
Topic: Physics
Published: 11/26/2012
Authors: Elizabeth A Donley, Francois-Xavier R. Esnault, Eric Michael Blanshan, John E Kitching
Abstract: A compact cold-atom clock based on coherent population trapping is being developed. The clock aims to ultimately achieve a timing uncertainty of a few nanoseconds per day. Here we present an initial evaluation of the three main systematic frequency ...
http://nist.gov/manuscript-publication-search.cfm?pub_id=912842

23. Enabling accurate differential calibration of modern GPS receivers
Topic: Physics
Published: 11/26/2012
Authors: Stefania Romisch, Victor Shufang Zhang, Thomas Edward Parker, Steven R Jefferts
Abstract: The difference between the local time reference and a GNSS receiver's internal time base is an essential contributor to the calibration of that receiver when used as a timing device. In the past, in the absence of a PPS output signal provided by th ...
http://nist.gov/manuscript-publication-search.cfm?pub_id=913227

24. GPS Carrier-Phase Time Transfer Boundary Discontinuity Investigation
Topic: Physics
Published: 11/26/2012
Authors: Jian Yao, Judah Levine
Abstract: We report on a study of the carrier-phase time transfer boundary discontinuity by the use of the precise point positioning (PPP) technique. Carrier-phase time transfer is first compared with two-way satellite time and frequency transfer (TWSTFT) bet ...
http://nist.gov/manuscript-publication-search.cfm?pub_id=912772

25. In Search of a New Primary GPS Receiver for NIST
Topic: Physics
Published: 11/26/2012
Author: Marc A Weiss
Abstract: A previous publication showed problems with the current NIST Time and Frequency Division primary GPS receiver [1] when used for Precise Point Positioning (PPP)-based carrier phase time transfer. We confirm that, for this receiver, boundary discontinu ...
http://nist.gov/manuscript-publication-search.cfm?pub_id=912972

26. Measurement of the velocity of the neutrino with MINOS
Topic: Physics
Published: 11/26/2012
Authors: Stefania Romisch, P Adamson, Neil Ashby, G. Barr, M. Bishal, A. Blake, G. J. Bock, D. Bogert, Russell Bumgarner, S. V. Cao, S. Childress, M. Christensen, J. Coelho, L. Corwin, D. CroninHennessy, J. K. de Jong, N. E. Devenish, M. V. Diwan, C. O. Escobar, J. J. Evans, E. Falk, G. J. Feldman, C. Flores, B. Fonville, M. V. Frohne, H. R. Gallager, A. Gavrilenko, R. A. Gomes, P. Gouffon, N. Graf, R. Gran, K. Grzelak, A. Habig, J. Hartnell, R. Hatcher, Jonathan Hirschauer, A. Holin, J. Hylen, G M. Irwin, Z. isvan, C. James, Steven R Jefferts, D. Jensen, T. Kafka, S. Kasahara, G. Koizumi, M. Kordosky, A. Kreymer, K. Lang, J. Ling, P. J. Litchfield, P. Lucas, W. A. Mann, M. L. Marshak, M. Mathis, Demetrios Matsakis, N. Mayer, Angela Mckinley, M. M. Medeiros, R. Mehdiyev, J. R. Meier, B. Mercurio, M. D. Messier, W. H. Miller, S. R. Mishra, S. Moed Sher, C. D. Moore, L. Mualem, J. A. Musser, J. K. Nelson, H. Newman, R. J. Nichol, J. A. Nowak, J. C. O'Conner, W. P. Oliver, M. Orchanian, R. B. Pahlka, J. Paley, Thomas Edward Parker, R. B. Patterson, G. Pawloski, S. PhanBudd, R. K. Plunkett, N. Poonthattatil, Ed Powers, X. Qiu, A. Radovic, B. Rebel, C. Rosenfeld, H. A. Rubin, M. C. Sanchez, J. Schneps, P Schireiner, A. Schreckenberger, R. Sharma, A, Sousa, N. Tagg, R, L. Talaga, J. Thomas, M. A. Thomson, X. Tian, S. C. Tognini, R. Toner, D. Torretta, G. Tzanakos, J. Urheim, P. Vahel, A. Webber, R. C. Webb, C. White, L. H. Whitehead, L. Whitehead, K. P. Wilson, S. G. Wojcicki, J. Wright, Victor Shufang Zhang, R. Zwaska
Abstract: The MINOS experiment uses a beam of predominantly muon-type neutrinos generated using protons from the Main Injector at Fermilab in Batavia, IL and travelling 735 km through the Earth to a disused iron mine in Soudan, MN. The 10 us-long beam pulse co ...
http://nist.gov/manuscript-publication-search.cfm?pub_id=913274

27. Recent Calibrations of UTC(NIST) and UTC(USNO)
Topic: Physics
Published: 11/26/2012
Authors: Victor Shufang Zhang, Thomas Edward Parker, Russell Bumgarner, Jonathan Hirschauer, Angela Mckinley, Stephen Mitchell, Ed Powers, Jim Skinner, Demetrios Matsakis
Abstract: The National Institute of Standards and Technology (NIST) and the United States Naval Observatory (USNO) use GPS common-view, carrier-phase time transfer and Two Way Satellite Time and Frequency Transfer (TWSTFT, also known as TWSTT) techniques in ou ...
http://nist.gov/manuscript-publication-search.cfm?pub_id=912837

28. Replicating UTC(NIST) at Remote Sites
Topic: Physics
Published: 11/26/2012
Authors: Michael A Lombardi, Andrew N Novick, J. Mauricio Lopez-Romero, Rodrigo Ramos
Abstract: The National Institute of Standards and Technology (NIST) is deploying disciplined oscillators that are referenced to the UTC(NIST) time scale through common-view observations of Global Positioning System (GPS) satellites. We present measurement res ...
http://nist.gov/manuscript-publication-search.cfm?pub_id=912711

29. Synchronization between remote sites for the MINOS experiment
Topic: Physics
Published: 11/26/2012
Authors: Stefania Romisch, Steven R Jefferts, Victor Shufang Zhang, Thomas Edward Parker, Neil Ashby, P Adamson, G. Barr, A. Habig, J Meier, C. James, R. Nicol, R. Plunkett, C. Rosenfeld, Russell Bumgarner, M. Christensen, Jonathan Hirschauer, B. Fonville, Demetrios Matsakis, Ed Powers, J. Wright, Angela Mckinley
Abstract: In the context of time-of-flight measurements, the timing at the departure and arrival locations is obviously critical to the outcome of the experiment. In the case of neutrino time-of-flight experiments, the locations are many hundreds of kilometer ...
http://nist.gov/manuscript-publication-search.cfm?pub_id=913108

30. Ultra-low noise regenerative frequency divider
Topic: Physics
Published: 11/11/2012
Authors: Archita Hati, Craig W Nelson, Corey A. Barnes, Danielle Grace Lirette, Jason Anthony DeSalvo, David Allan Howe
Abstract: We designed ultra-low noise regenerative divider-by-2 circuits that operate at input frequencies of 20 MHz and 10 MHz. We achieved residual output-referred single-sideband phase noise below -162 dBc/Hz at 10 Hz offset for a single divider at these f ...
http://nist.gov/manuscript-publication-search.cfm?pub_id=910794