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B, D and K Decays

Description: The present report documents the results of Working Group 2: B, D and K decays, of the workshop on Flavor in the Era of the LHC, held at CERN from November 2005 through March 2007. With the advent of the LHC, we will be able to probe New Physics (NP) up to energy scales almost one order of magnitude larger than it has been possible with present accelerator facilities. While direct detection of new particles will be the main avenue to establish the presence of NP at the LHC, indirect searches wi… more
Date: March 7, 2008
Creator: Artuso, M.; Asner, D. M.; Ball, P.; Baracchini, E.; Bell, G.; Beneke, M. et al.
Partner: UNT Libraries Government Documents Department
open access

Structures in Molecular Clouds: Modeling

Description: No Description Available.
Date: March 7, 2006
Creator: Kane, J. O.; Ryutov, D. D.; Remington, B. A.; Pound, M. & Mizuta, A.
Partner: UNT Libraries Government Documents Department
open access

Applications of Lagrangian Dispersion Modeling to the Analysis of Changes in the Specific Absorption of Elemental Carbon

Description: We use a Lagrangian dispersion model driven by a mesoscale model with four-dimensional data assimilation to simulate the dispersion of elemental carbon (EC) over a region encompassing Mexico City and its surroundings, the study domain for the 2006 MAX-MEX experiment, which was a component of the MILAGRO campaign. The results are used to identify periods when biomass burning was likely to have had a significant impact on the concentrations of elemental carbon at two sites, T1 and T2, downwind of… more
Date: March 7, 2008
Creator: Doran, J. C.; Fast, Jerome D.; Barnard, James C.; Laskin, Alexander; Desyaterik, Yury; Gilles, Marry K. et al.
Partner: UNT Libraries Government Documents Department
open access

Collider Aspects of Flavour Physics at High Q

Description: This chapter of the report of the 'Flavour in the era of LHC' workshop discusses flavor related issues in the production and decays of heavy states at LHC, both from the experimental side and from the theoretical side. We review top quark physics and discuss flavor aspects of several extensions of the Standard Model, such as supersymmetry, little Higgs model or models with extra dimensions. This includes discovery aspects as well as measurement of several properties of these heavy states. We al… more
Date: March 7, 2008
Creator: del Aguila, F.; Aguilar-Saavedra, J. A.; Allanach, B. C.; Alwall, J.; Andreev, Yu.; Aristizabal Sierra, D. et al.
Partner: UNT Libraries Government Documents Department
open access

Using Higher Order Modes in Superconducting Accelerating Cavities for Beam Monitoring

Description: Dipole modes have been shown to be successful diagnostics for the beam position in superconducting accelerating cavities at the Free Electron Laser in Hamburg (FLASH) facility at DESY. By help of downmixing electronics the signals from the two higher order mode (HOM) couplers mounted on each cavity are monitored. The calibration, based on singular value decomposition, is more complicated than in standard position monitors. Position like signals based on this calibration are currently being in t… more
Date: March 7, 2008
Creator: Molloy, S.; Baboi, N.; Eddy, N.; Frisch, J.; Hendrickson, L.; Hensler, O. et al.
Partner: UNT Libraries Government Documents Department
open access

Resolvability of positron decay channels

Description: Many data analysis treatments of positron experiments attempt to resolve two or more positron decay or exist channels which may be open simultaneously. Examples of the need to employ such treatments of the experimental results can be found in the resolution of the constituents of a defect ensemble, or in the analysis of the complex spectra which arise from the interaction of slow positrons at or near the surfaces of solids. Experimental one- and two-dimensional angular correlation of annihilati… more
Date: March 7, 1985
Creator: Fluss, M.J.; Howell, R.H.; Rosenberg, I.J. & Meyer, P.
Partner: UNT Libraries Government Documents Department
open access

Improved system for perpendicular electron-cyclotron emission measurements on TMX-Upgrade

Description: Perpendicular electron-cyclotron emission (PECE) is used on TMX-U to diagnose thermal-barrier hot electrons (T/sub H/ approx. 100 to 400 keV); yielding the time history of the temperature of these relativistic electrons. We describe an improved quasi-optical viewing system for these measurements that uses high sensitivity superheterodyne receivers at fixed frequencies of 60, 98, 130, and 196 GHz. The improved viewing and transport system consists of an off-axis ellipsoidal mirror that images th… more
Date: March 7, 1986
Creator: Lasnier, C. J.; Ellis, R. F. & James, R. A.
Partner: UNT Libraries Government Documents Department
open access

An Implicit "Drift-Lorentz" Particle Mover for Plasma and Beam Simulations

Description: In order to efficiently perform particle simulations in systems with widely varying magnetization, we have developed a 'drift-Lorentz mover', which interpolates between full particle dynamics and drift kinetics in such a way as to preserve a physically correct gyroradius and particle drifts for both large and small ratios of the timestep to the cyclotron period. In order to extend applicability of the mover to systems with plasma frequency exceeding the cyclotron frequency - such as one may hav… more
Date: March 7, 2008
Creator: Cohen, R H; Friedman, A; Grote, D P & Vay, J
Partner: UNT Libraries Government Documents Department
open access

Autonomous Sub-Pixel Satellite Track Endpoint Determination for Space Based Images

Description: An algorithm for determining satellite track endpoints with sub-pixel resolution in spaced-based images is presented. The algorithm allows for significant curvature in the imaged track due to rotation of the spacecraft capturing the image. The motivation behind the subpixel endpoint determination is first presented, followed by a description of the methodology used. Results from running the algorithm on real ground-based and simulated spaced-based images are shown to highlight its effectiveness. more
Date: March 7, 2011
Creator: Simms, L M
Partner: UNT Libraries Government Documents Department
open access

Empirical Model for Formulation of Crystal-Tolerant Hlw Glasses

Description: Historically, high-level waste (HLW) glasses have been formulated with a low liquideus temperature (T{sub L}), or temperature at which the equilibrium fraction of spinel crystals in the melt is below 1 vol % (T{sub 0.01}), nominally below 1050 C. These constraints cannot prevent the accumulation of large spinel crystals in considerably cooler regions ({approx} 850 C) of the glass discharge riser during melter idling and significantly limit the waste loading, which is reflected in a high volume … more
Date: March 7, 2012
Creator: Kruger, A. A.; Matyas, J.; Huckleberry, A. R.; Vienna, J. D. & Rodriguez, C. A.
Partner: UNT Libraries Government Documents Department
open access

In-Flight Measurements of Capsule Adiabats in Laser Driven Spherical Implosions

Description: We present the first x-ray Thomson scattering measurements of temperature and density from spherically imploding matter. The shape of the Compton downscattered spectrum provides a first-principles measurement of the electron velocity distribution function, dependent on T{sub e} and the Fermi temperature T{sub F} {approx} n{sub e}{sup 2/3}. In flight compressions of Be and CH targets reach 6-13 times solid density, with T{sub e}/T{sub F} {approx} 0.4-0.7, resulting in minimum adiabats of {approx… more
Date: March 7, 2011
Creator: Kritcher, A L; Doppner, T; Fortman, C; Ma, T; Landen, O L; Wallace, R et al.
Partner: UNT Libraries Government Documents Department
open access

Optimization of Direct Ionization of CO2 by Controlling the Gas Flow Inside of a Beam-Target

Description: We designed and optimized a target that directs a CO{sub 2} pulse onto a Ti surface where a Cs{sup +} sputtering beam ionizes the CO{sub 2} to generate C{sup -}. These targets will be used for the direct ionization of CO{sub 2} pulses to enable the measurement of carbon isotope ratios in real time. The design was based on the results of Comsol{trademark} simulations of the target configurations.
Date: March 7, 2011
Creator: Salazar Quintero, G A & Ognibene, T
Partner: UNT Libraries Government Documents Department
open access

Uranyl Sequestration: Synthesis and Structural Characterization of Uranyl Complexes with a Tetradentate Methylterephthalamide Ligand

Description: Uranyl complexes of a bis(methylterephthalamide) ligand (LH{sub 4}) have been synthesized and characterized by X-ray crystallography. The structure is an unexpected [Me{sub 4}N]{sub 8}[L(UO{sub 2})]{sub 4} tetramer, formed via coordination of the two MeTAM units of L to two uranyl moieties. Addition of KOH to the tetramer gave the corresponding monomeric uranyl methoxide species [Me{sub 4}N]K{sub 2}[LUO{sub 2}(OMe)].
Date: March 7, 2011
Creator: Ni, Chengbao; Shuh, David & Raymond, Kenneth
Partner: UNT Libraries Government Documents Department
open access

"Computational Modeling of Actinide Complexes"

Description: We will present our recent studies on computational actinide chemistry of complexes which are not only interesting from the standpoint of actinide coordination chemistry but also of relevance to environmental management of high-level nuclear wastes. We will be discussing our recent collaborative efforts with Professor Heino Nitsche of LBNL whose research group has been actively carrying out experimental studies on these species. Computations of actinide complexes are also quintessential to our … more
Date: March 7, 2007
Creator: Balasubramanian, K
Partner: UNT Libraries Government Documents Department
open access

Further studies of electron avalanche gain in liquid argon

Description: Previously we showed how small admixtures of xenon (Xe) stabilize electron avalanches in liquid Argon (LAr). In the present work, we have measured the positive charge carrier mobility in LAr with small admixtures of Xe to be 6.4 x 10{sup -3} cm{sup 2}/Vsec, in approximate agreement with the mobility measured in pure LAr, and consistent with holes as charge carriers. We have measured the concentration of Xe actually dissolved in the liquid and compared the results with expectations based on the … more
Date: March 7, 2003
Creator: Kim, J. G.; Dardin, S. M.; Kadel, R. W.; Kadyk, J. A.; Jackson, K. H.; Peskov, V. et al.
Partner: UNT Libraries Government Documents Department
open access

An X-ray Absorption Edge Detector for High-Resolution Measurement of Undulator Effective K-Parameter

Description: The spectrum of angle-integrated undulator radiation displays a sharp edge at every harmonic photon energy. A technique utilizing this feature to measure minute changes in K-parameters of an undulator in a free-electron laser has been proposed. To date, this technique requires the use of crystal monochromators as bandpass filters whose energy centroid depends on the incident angle of the x-ray beam. In this work we propose to use the absorption edge of an appropriate element as an energy-select… more
Date: March 7, 2007
Creator: Yang, B.; /Argonne & Galayda, J.N.
Partner: UNT Libraries Government Documents Department
open access

Color and Variability Characteristics of Point Sources in the Faint Sky Variability Survey

Description: The authors present an analysis of the color and variability characteristics for point sources in the Faint Sky Variability Survey (FSVS). The FSVS cataloged {approx} 23 square degrees in BVI filters from {approx} 16-24 mag to investigate variability in faint sources at moderate to high Galactic latitudes. Point source completeness is found to be >83% for a selected representative sample (V - 17.5-22.0 mag, B-V = 0.0-1.5) containing both photometric B, V detections and 80% of the time-sample… more
Date: March 7, 2005
Creator: Huber, M E; Everett, M E & Howell, S B
Partner: UNT Libraries Government Documents Department
open access

Lethality Effects of a High-Power Solid-State Laser

Description: We study the material interactions of a 25-kW solid-state laser, in experiments characterized by relatively large spot size sizes ({approx}3 cm) and the presence of airflow. The targets are 1-cm slabs of iron or aluminum. In the experiments with iron, we show that combustion plays an important role in heating the material. In the experiments with aluminum, there is a narrow range of intensities within which the material interactions vary from no melting at all to complete melt-through. A paint … more
Date: March 7, 2007
Creator: Boley, C.; Fochs, S. & Rubenchik, A.
Partner: UNT Libraries Government Documents Department
open access

Underwater Blast Experiments and Modeling for Shock Mitigation

Description: A simple but novel mitigation concept to enforce standoff distance and reduce shock loading on a vertical, partially-submerged structure is evaluated using scaled aquarium experiments and numerical modeling. Scaled, water tamped explosive experiments were performed using three gallon aquariums. The effectiveness of different mitigation configurations, including air-filled media and an air gap, is assessed relative to an unmitigated detonation using the same charge weight and standoff distance. … more
Date: March 7, 2010
Creator: Glascoe, L; McMichael, L; Vandersall, K & Margraf, J
Partner: UNT Libraries Government Documents Department
open access

Antimicrobial Properties of Diamondlike Carbon-Silver-Platinum Nanocomposite Thin Films

Description: Silver and platinum were incorporated within diamondlike carbon (DLC) thin films using a multicomponent target pulsed laser deposition process. Transmission electron microscopy of the DLC-silver and DLC-platinum composite films reveals that the metals self-assemble into particulate nanocomposite structures. Nanoindentation testing has shown that diamondlike carbon-silver films exhibit hardness and Young's modulus values of approximately 37 GPa and 333 GPa, respectively. DLC-silver-platinum film… more
Date: March 7, 2005
Creator: CHRISTOPHER, BERRY
Partner: UNT Libraries Government Documents Department
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