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Measuring Cluster Relaxedness

Description: When is a dark matter halo 'relaxed'? In our efforts to understand the structure of the universe, dark matter simulations have provided essential grounds for theoretical predictions. These simulations provide a wealth of ways of parameterizing and measuring the features of astronomical objects. It is these measurements on which we base comparisons of our world and our attempts to re-create it. One of the essential questions dark matter simulations help address is how dark matter halos evolve. H… more
Date: August 24, 2012
Creator: Moreland, Blythe & /SLAC, /Michigan U.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Simulations of Ion Migration in the LCLS RF Gun and Injector

Description: The motivation for this work was the observed surface contamination of the first LCLS RF gun copper cathode. We will present the results of simulations in regards to ion migration in the LCLS gun. Ions of residual gases will be created by interaction of molecular gas species with the UV drive laser beam and by the electron beam itself. The larger part of those ionized molecules remain in the vicinity of creation, are transported towards beam line walls or away from the cathode. However a small … more
Date: June 25, 2012
Creator: Brachmann, Axel & Dowell, David
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Initial Examination of Low Velocity Sphere Impact of Glass Ceramics

Description: This report summarizes US Army TARDEC sponsored work at Oak Ridge National Laboratory (ORNL) involving low velocity (< 30 m/s or < 65 mph) sphere impact testing of two materials from the lithium aluminosilicate family reinforced with different amounts of ceramic particulate, i.e., glass-ceramic materials, SCHOTT Resistan{trademark}-G1 and SCHOTT Resistan{trademark}-L. Both materials are provided by SCHOTT Glass (Duryea, PA). This work is a follow-up to similar sphere impact studies comple… more
Date: June 1, 2012
Creator: Morrissey, Timothy G.; Fox, Ethan E.; Wereszczak, Andrew A. & Ferber, Mattison K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Transport from the Recycler Ring to the Antiproton Source Beamlines

Description: In the post-NOvA era, the protons are directly transported from the Booster ring to the Recycler ring rather than the Main Injector. For Mu2e and g-2 project, the Debuncher ring will be modified into a Delivery ring to deliver the protons to both Mu2e and g-2 experiments. Therefore, it requires the transport of protons from the Recycler Ring to the Delivery ring. A new transfer line from the Recycler ring to the P1 beamline will be constructed to transport proton beam from the Recycler Ring to … more
Date: May 14, 2012
Creator: Xiao, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Low Velocity Sphere Impact of a Borosilicate Glass

Description: This report summarizes US Army TARDEC sponsored work at Oak Ridge National Laboratory (ORNL) involving low velocity (< 30 m/s or < 65 mph) ball impact testing of Borofloat borosilicate glass, and is a follow-up to a similar study completed by the authors on Starphire soda-lime silicate glass last year. The response of the borosilicate glass to impact testing at different angles was also studied. The Borofloat glass was supplied by the US Army Research Laboratory and its tin-side was impac… more
Date: May 1, 2012
Creator: Morrissey, Timothy G.; Ferber, Mattison K.; Wereszczak, Andrew A. & Fox, Ethan E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Marine Hydrokinetic Turbine Power-Take-Off Design for Optimal Performance and Low Impact on Cost-of-Energy: Preprint

Description: Marine hydrokinetic devices are becoming a popular method for generating marine renewable energy worldwide. These devices generate electricity by converting the kinetic energy of moving water, wave motion or currents, into electrical energy through the use of a Power-Take-Off (PTO) system. Most PTO systems incorporate a mechanical or hydraulic drive train, power generator and electric control/conditioning system to deliver the generated electric power to the grid at the required state. Like win… more
Date: April 1, 2012
Creator: Beam, M.; Kline, B.; Elbing, B.; Straka, W.; Fontaine, A.; Lawson, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Atomistic Time-Domain Simulations of Light-Harvesting and Charge-Transfer Dynamics in Novel Nanoscale Materials for Solar Hydrogen Production.

Description: Funded by the DOE grant (i) we continued to study and analyze the atomistic detail of the electron transfer (ET) across the chromophore-TiO2 interface in Gratzel cell systems for solar hydrogen production. (ii) We extensively investigated the nature of photoexcited states and excited state dynamics in semiconductor quantum dots (QD) designed for photovoltaic applications. (iii) We continued a newly initiated research direction focusing on excited state properties and electron-phonon interaction… more
Date: March 22, 2012
Creator: Prezhdo, Oleg V.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
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Emergent Phenomena at Oxide Interfaces

Description: Transition metal oxides (TMOs) are an ideal arena for the study of electronic correlations because the s-electrons of the transition metal ions are removed and transferred to oxygen ions, and hence the strongly correlated d-electrons determine their physical properties such as electrical transport, magnetism, optical response, thermal conductivity, and superconductivity. These electron correlations prohibit the double occupancy of metal sites and induce a local entanglement of charge, spin, and… more
Date: February 16, 2012
Creator: Hwang, H.Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Light-Front Holographic QCD

Description: The relation between the hadronic short-distance constituent quark and gluon particle limit and the long-range confining domain is yet one of the most challenging aspects of particle physics due to the strong coupling nature of Quantum Chromodynamics, the fundamental theory of the strong interactions. The central question is how one can compute hadronic properties from first principles; i.e., directly from the QCD Lagrangian. The most successful theoretical approach thus far has been to quantiz… more
Date: February 16, 2012
Creator: Brodsky, Stanley J.; /SLAC /Southern Denmark U., CP3-Origins; de Teramond, Guy F. & U., /Costa Rica
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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AN ASSESSMENT OF FLYWHEEL HIGH POWER ENERGY STORAGE TECHNOLOGY FOR HYBRID VEHICLES

Description: An assessment has been conducted for the DOE Vehicle Technologies Program to determine the state of the art of advanced flywheel high power energy storage systems to meet hybrid vehicle needs for high power energy storage and energy/power management. Flywheel systems can be implemented with either an electrical or a mechanical powertrain. The assessment elaborates upon flywheel rotor design issues of stress, materials and aspect ratio. Twelve organizations that produce flywheel systems submitte… more
Date: February 1, 2012
Creator: Hansen, James Gerald
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Event-by-Event Evaluation of the Prompt Fission Neutron Spectrum From 239pu(N,F)

Description: We have developed an improved evaluation method for the spectrum of neutrons emitted in fission of {sup 239}Pu induced by incident neutrons with energies up to 20 MeV. The <v> covariance data, including incident energy correlations introduced by the <v> evaluation method, were used to fix the input parameters in our event-by-event model of fission, FREYA, by applying formal statistical methods. Formal estimates of uncertainties in the evaluation were developed by randomly sampling m… more
Date: November 28, 2011
Creator: Vogt, R.; Randrup, J.; Brown, D. A.; Descalle, M. A. & Ormand, W. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Low Velocity Sphere Impact of a Soda Lime Silicate Glass

Description: This report summarizes TARDEC-sponsored work at Oak Ridge National Laboratory (ORNL) during the FY11 involving low velocity (< 30 m/s or < 65 mph) ball impact testing of Starphire soda lime silicate glass. The intent was to better understand low velocity impact response in the Starphire for sphere densities that bracketed that of rock. Five sphere materials were used: borosilicate glass, soda-lime silicate glass, steel, silicon nitride, and alumina. A gas gun was fabricated to produce con… more
Date: October 1, 2011
Creator: Wereszczak, Andrew A.; Fox, Ethan E.; Morrissey, Timothy G. & Vuono, Daniel J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Offshore Renewable Energy R&D (Fact Sheet)

Description: This fact sheet describes the offshore renewable energy R&D efforts at NREL's NWTC. As the United States increases its efforts to tap the domestic energy sources needed to diversify its energy portfolio and secure its energy supply, more attention is being focused on the rich renewable resources located offshore. Offshore renewable energy sources include offshore wind, waves, tidal currents, ocean and river currents, and ocean thermal gradients. According to a report published by the Nation… more
Date: October 1, 2011
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Applications of Event-by-Event Fission Modeling with FREYA

Description: The recently developed code FREYA (Fission Reaction Event Yield Algorithm) generates large samples of complete fission events, consisting of two receding product nuclei as well as a number of neutrons and photons, all with complete kinematic information. Thus it is possible to calculate arbitrary correlation observables whose behavior may provide unique insight into the fission process. We first discuss the present status of FREYA, which has now been extended to include spontaneous fission. Con… more
Date: September 16, 2011
Creator: Vogt, R & Randrup, J
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Experimental investigation of the Richtmyer-Meshkov instability.

Description: The Richtmyer-Meshkov instability (RMI) is experimentally investigated using several different initial conditions and with a range of diagnostics. First, a broadband initial condition is created using a shear layer between helium+acetone and argon. The post-shocked turbulent mixing is investigated using planar laser induced fluorescence (PLIF). The signature of turbulent mixing is present in the appearance of an inertial range in the mole fraction energy spectrum and the isotropy of the late-ti… more
Date: September 1, 2011
Creator: Weber, Christopher R. (University of Wisconsin-Madison, Madison, WI)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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SDI CFD MODELING ANALYSIS

Description: The Savannah River Remediation (SRR) Organization requested that Savannah River National Laboratory (SRNL) develop a Computational Fluid Dynamics (CFD) method to mix and blend the miscible contents of the blend tanks to ensure the contents are properly blended before they are transferred from the blend tank; such as, Tank 50H, to the Salt Waste Processing Facility (SWPF) feed tank. The work described here consists of two modeling areas. They are the mixing modeling analysis during miscible liqu… more
Date: May 5, 2011
Creator: Lee, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Li+ alumino-silicate ion source development for the Neutralized Drift Compression Experiment (NDCX-II)

Description: To heat targets to electron-volt temperatures for the study of warm dense matter with intense ion beams, low mass ions, such as lithium, have an energy loss peak (dE/dx) at a suitable kinetic energy. The Heavy Ion Fusion Sciences (HIFS) program at Lawrence Berkeley National Laboratory will carry out warm dense matter experiments using Li{sup +} ion beam with energy 1.2-4 MeV in order to achieve uniform heating up to 0.1-1 eV. The accelerator physics design of Neutralized Drift Compression Exper… more
Date: April 20, 2011
Creator: LBNL; Roy, P. K.; Greenway, W.; Kwan, J. W.; Seidl, P. A. & Waldron, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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NDCX-II, an Induction Linac for HEDP and IFE Research

Description: The Heavy Ion Fusion Science Virtual National Laboratory in the USA is constructing a new Neutralized Drift Compression eXperiment (NDCX-II) at LBNL. This facility is being developed for high energy density physics and inertial fusion energy research. The 12 m long induction linac in NDCX-II will produce a Li{sup +} beam pulse, at energies of 1.2-3 MeV, to heat target material to the warm dense matter regime ({approx} 1 eV). By making use of special acceleration voltage waveforms, 2.5T solenoid… more
Date: April 20, 2011
Creator: Kwan, J. W.; Arbelaez, D.; Bieniosek, F. M.; Faltens, A.; Friedman, A.; Galvin, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Computational Hydrocode Study of Target Damage due to Fragment-Blast Impact

Description: A target's terminal ballistic effects involving explosively generated fragments, along with the original blast, are of critical importance for many different security and safety related applications. Personnel safety and protective building design are but a few of the practical disciplines that can gain from improved understanding combined loading effects. Traditionally, any engineering level analysis or design effort involving explosions would divide the target damage analysis into two corresp… more
Date: March 24, 2011
Creator: Hatch-Aguilar, T; Najjar, F & Szymanski, E
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Heavy Ion Inertial Fusion Energy: Summaries of Program Elements

Description: The goal of the Heavy Ion Fusion (HIF) Program is to apply high-current accelerator technology to IFE power production. Ion beams of mass {approx}100 amu and kinetic energy {>=} 1 GeV provide efficient energy coupling into matter, and HIF enjoys R&D-supported favorable attributes of: (1) the driver, projected to be robust and efficient; see 'Heavy Ion Accelerator Drivers.'; (2) the targets, which span a continuum from full direct to full indirect drive (and perhaps fast ignition), and ha… more
Date: February 28, 2011
Creator: Friedman, A; Barnard, J J; Kaganovich, I; Seidl, P A; Briggs, R J; Faltens, A et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Physics of Ion Decoupling in Magnetized Plasma Explosions

Description: When a finite pulse of plasma expands into a magnetized background plasma, MHD predicts the pulse expel background plasma and its B-field - i.e. cause a magnetic 'bubble'. The expanding plasma is confined within the bubble, later to escape down the B-field lines. MHD suggests that the debris energy goes to expelling the B-field from the bubble volume and kinetic energy of the displaced background. For HANEs, this is far from the complete story. For many realistic HANE regimes, the long mean-fre… more
Date: February 8, 2011
Creator: Hewett, D; Larson, D & Brecht, S
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A Hamiltonian Model of Dissipative Wave-particle Interactions and the Negative-mass Effect

Description: The effect of radiation friction is included in the Hamiltonian treatment of wave-particle interactions with autoresonant phase-locking, yielding a generalized canonical approach to the problem of dissipative dynamics near a nonlinear resonance. As an example, the negativemass eff ect exhibited by a charged particle in a pump wave and a static magnetic field is studied in the presence of the friction force due to cyclotron radiation. Particles with negative parallel masses m! are shown to trans… more
Date: February 7, 2011
Creator: Zhmoginov, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Note on numerical study of the beam energy spread in NDCX-I

Description: The kinetic energy spread (defined here as the standard deviation of the beam particle energies) sets the ultimate theoretical limit on the longitudinal compression that can be attained on NDCX-I and NDCX-II. Experimental measurements will inevitably include the real influences on the longitudinal phase space of the beam due to injector and accelerator field imperfections1. These induced energy variations may be the real limit to the longitudinal compression in an accelerator. We report on a nu… more
Date: January 19, 2011
Creator: Vay, J. L.; Seidl, P. A. & Friedman, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Simulation of Alpha Particles in Rotating Plasma Interacting with a Stationary Ripple

Description: Superthermal ExB rotation can provide magnetohydrodynamic (MHD) stability and enhanced confinement to axisymmetric mirrors. However, the rotation speed has been limited by phenomena at end electrodes. A new prediction is that rotation might instead be produced using a magnetic ripple and alpha particle kinetic energy, in an extension of the alpha channeling concept. The interaction of alpha particles with the ripple results in visually interesting and practically useful orbits.
Date: January 11, 2011
Creator: Fetterman, Abraham J. & Fisch, Nathaniel J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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