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You searched on: Author: kevin coakley

Displaying records 31 to 40 of 62 records.
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31. Progress Towards a Precision Measurement of the Neutron Lifetime Using Magnetically Trapped Ultracold Neutrons
Published: 1/1/2006
Authors: P.-N. Seo, Kevin J Coakley, J M Doyle, F H DuBose, R Golub, E Korobkina, S K Lamoreaux, Hans P Mumm, C M O'Shaughnessy, G R Palmquis, A K Thompson, Grace L Yang, L Yang, Paul R Huffman
Abstract: As part of an on-going program utilizing magnetically trapped ultracold neutrons (UCNs,) we are developing a technique that offers the possibility of improving the precision of the neutron lifetime by more than an order of magnitude. The experiment w ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150289

32. Relative Permittivity and Loss Tangent Measurement Using the NIST 60 mm Cylindrical Cavity
Series: Technical Note (NIST TN)
Report Number: 1537
Published: 9/1/2005
Authors: Michael D Janezic, Jolene D Splett, Kevin J Coakley, Raian K. Kaiser, John H. Grosvenor Jr
Abstract: In order to develop a dielectric Standard Reference Material (SRM), a measurement system for measuring the relative permittivity and loss tangent of dielectric materials is presented. To achieve the necessary level of measurement accuracy, we selecte ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31716

33. Chaotic Scattering and Escape Times of Marginally Trapped Ultracold Neutrons
Series: Journal of Research (NIST JRES)
Published: 7/1/2005
Authors: Kevin J Coakley, J M Doyle, S N Dzhosyuk, L Yang, Paul R Huffman
Abstract: We compute classical trajectories of ultracold neutrons (UCNs) in a superconducting Ioffe-type magnetic trap using a symplectic integration method. We find that the computed escape time for a particular set of initial conditions (momentum and positio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150061

34. Secondary ion mass spectrometry measurements of isotopic ratios: Correction for time varying count rates
Published: 1/15/2005
Authors: Kevin J Coakley, A M Leifer, David S Simons
Abstract: In Secondary Ion Mass Spectrometry measurement systems, the count rate of isotopes may vary in time as a particle is consumed during the analysis. Since only one isotope at a time is measured, this drift can introduce systematic error into the estima ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150055

35. Secondary Ion Mass Spectrometry Measurements of Isotopic Ratios: Correction for Time Varying Count Rate
Published: 1/1/2005
Authors: Kevin J Coakley, A M Leifer, David S Simons
Abstract: In Secondary Ion Mass Spectrometry measurement systems, the count rate of isotopes may vary in time as a particle is consumed during the analysis. Since only one isotope at a time is measured, this drift can introduce systematic error into the estim ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50570

36. Nonlinear Modeling of Tunnel Diode Detectors
Published: 9/24/2004
Authors: David K Walker, Kevin J Coakley, Jolene D Splett
Abstract: We investigate the sensitivity and nonlinear properties of a tunnel diode microwave detector as functions of the input power and the load impedance presented at the detector's output. We compare the two-tone method estimate of nonlinearity with preci ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31739

37. Chaotic Scattering and Escape Times of Marginally Trapped Ultracold Neutrons
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: of
Published: 4/1/2004
Authors: Kevin J Coakley, J M Doyle, S N Dzhosyuk, L Yang, Paul R Huffman
Abstract: We compute classical trajectories of Ultracold neutrons (UCNs) in a superconducting Ioffe-type magnetic trap using a symplectic integration method. We find that the computed escape time for a particular set of initial conditions (momentum and posit ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150571

38. Adaptive Characterization of Jitter Noise in Sampled High-Speed Signals
Published: 10/1/2003
Authors: Kevin J Coakley, Chih-Ming Wang, Paul D Hale, Tracy S. Clement
Abstract: We estimate the root-mean-square (RMS) value of timing jitter noise in simulated signals similar to measured high-speed sampled signals. The simulated signals are contaminated by additive noise, timing jitter noise, and time shift errors. Before e ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=51084

39. Erratum: Modeling Detector Response for Neutron Depth Profiling
Published: 8/10/2003
Authors: Kevin J Coakley, R. G. Downing, George Paul Lamaze, H C Hofsass, C Ronning, J Biegel
Abstract: In a previous paper, we analyzed the Neutron Depth Profiling energy spectrum collected from a diamond-like carbon (DLC) sample doped with boron. Based on a numerical model for the Detector Response Function (DRF), we estimated a theoretical boron pr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50792

40. Two Aspects of Thin Film Analysis: Boron Profile and Scattering Length Density Profile
Published: 6/1/2003
Authors: Huaiyu H Chen-Mayer, George Paul Lamaze, Kevin J Coakley, Sushil K Satija
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903301



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