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Recent results from the PEP4-TPC on quark fragmentation

Description: The physics goals for the PEP-4/PEP-9 experiment concentrate on two areas: the fragmentation properties of quarks and gluons produced in e+e- annihilation, and the investigation of hadron production in 2-photon collisions. Only the first of these topics is addressed. Despite the many successes of QCD in the description of deep inelastic reactions, the basic fragmentation process of quarks and gluons is not very well understood. This lack of knowledge has been shown to jeopardize precise test of… more
Date: November 12, 1983
Creator: Hofmann, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

NMR measurements in SSC dipole D00001

Description: The first 16.5 m long SSC dipole magnet (D00001) had its field intensity measured as a function of position with a custom made NMR magnetometer. A short description of the probe is presented. The data obtained (most of it near 2 T spaced apart by one inch) shows an average transfer function of 1.02830 T/KA with position dependent values deviating from the average by up to .00130 T/KA revealing contruction inhomogeneities that were measured with a sensitivity of 25 ppM.
Date: September 12, 1986
Creator: Kuchnir, M.; Schmidt, E.E.; Hanft, R.W. & Strait, J.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Conservative Differencing of the Electron Fokker-Planck Transport Equation

Description: We need to extend the applicability and improve the accuracy of kinetic electron transport codes. In this paper, special attention is given to modelling of e-e collisions, including the dominant contributions arising from anisotropy. The electric field and spatial gradient terms are also considered. I construct finite-difference analogues to the Fokker-Planck integral-differential collision operator, which conserve the particle number, momentum and energy integrals (sums) regardless of the coar… more
Date: January 12, 1981
Creator: Langdon, A. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
captions transcript

[News Clip: Air station]

Description: Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: October 12, 1979, 6:00 p.m.
Duration: 2 minutes 05 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Video
Partner: UNT Libraries Special Collections
open access

Compositeness and QCD at the SSC

Description: Compositeness may be signaled by an increase in the production of high transverse momentum hadronic jet pairs or lepton pairs. The hadronic jet signal competes with the QCD production of jets, a subject of interest in its own right. Tests of perturbative QCD at the SSC will be of special interest because the calculations are expected to be quite reliable. Studies show that compositeness up to a scale of 20 to 35 TeV would be detected in hadronic jets at the SSC. Leptonic evidence would be disco… more
Date: October 12, 1987
Creator: Barnes, V.; Blumenfeld, B.; Cahn, R.; Chivukula, S.; Ellis, S.; Freeman, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Breakdown Characteristics Study on an 18 Cell X-band Structure

Description: A CLIC designed 18 cells, low group velocity (2.4% to 1.0% c), X-band (11.4 GHz) accelerator structure (denoted T18) was designed at CERN, its cells were built at KEK, and it was assembled and tested at SLAC. An interesting feature of this structure is that the gradient in the last cell is about 50% higher than that in the first cell. This structure has been RF conditioned at SLAC NLCTA for about 1400 hours where it incurred about 2200 breakdowns. This paper presents the characteristics of thes… more
Date: November 12, 2008
Creator: Wang, Faya
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Rare B Decays at Babar

Description: The author presents some of the most recent BABAR measurements for rare B decays. These include rate asymmetries in the B decays to K{sup (*)}l{sup +}l{sup -} and K{sup +}{pi}{sup -} and branching fractions in the B decays to l{sup +}{nu}{sub l}, K{sub 1}(1270){sup +}{pi}{sup -} and K{sub 1}(1400){sup +}{pi}{sup -}. The author also reports a search for the B{sup +} decay to K{sub S}{sup 0}K{sub S}{sup 0}{pi}{sup +}.
Date: January 12, 2009
Creator: Palombo, Fernando & Collaboration, for the BABAR
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Performance of a 1.3 GHZ Normal-Conducting 5-Cell Standing-Wave Cavity

Description: A 5-cell, normal-conducting, 1.3 GHz, standing-wave (SW) cavity was built as a prototype capture accelerator for the ILC positron source. Although the ILC uses predominantly superconducting cavities, the capture cavity location in both a high radiation environment and a solenoidal magnetic field requires it to be normal conducting. With the relatively high duty ILC beam pulses (1 msec at 5 Hz) and the high gradient required for efficient positron capture (15 MV/m), achieving adequate cavity coo… more
Date: November 12, 2008
Creator: Wang, Faya; Adolphsen, Chris & Wang, Juwen
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Quantum Calisthenics: Gaussians, The Path Integral and Guided Numerical Approximations

Description: It is apparent to anyone who thinks about it that, to a large degree, the basic concepts of Newtonian physics are quite intuitive, but quantum mechanics is not. My purpose in this talk is to introduce you to a new, much more intuitive way to understand how quantum mechanics works. I begin with an incredibly easy way to derive the time evolution of a Gaussian wave-packet for the case free and harmonic motion without any need to know the eigenstates of the Hamiltonian. This discussion is complete… more
Date: February 12, 2009
Creator: Weinstein, Marvin
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Systematics of Alpha-Radioactivity

Description: Correlations of alpha-decay energies in terms of mass number and atomic number have been made for all of the alpha-emitting species now numbering over 100. For each element isotopes show increase in alpha-energy with decrease in mass number except in the region of 126 neutrons where there is an explainable reversal. This reversal has the effect of creating a region of relatively low alpha-energy and long half-life at low mass numbers for such elements as astatine, emanation, francium, and possi… more
Date: September 12, 1949
Creator: Perlman, I.; Ghiorso, A. & Seaborg, G. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Redshift Dependence of Gamma-Ray Absorption in the Environments of Strong-Line AGNs

Description: The case of {gamma}-ray absorption due to photon-photon pair production of jet photons in the external photon environments, such as the accretion disk and the broad-line region radiation fields, of {gamma}-ray--loud active galactic nuclei (AGNs) that exhibit strong emission lines is considered. I demonstrate that this 'local opacity,' if detected, will almost unavoidably be redshift-dependent in the sub-TeV range. This introduces nonnegligible biases and complicates approaches for studying the … more
Date: November 12, 2007
Creator: Reimer, A. & /Stanford U., HEPL /KIPAC, Menlo Park
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Physics division annual report 2005.

Description: This report highlights the research performed in 2005 in the Physics Division of Argonne National Laboratory. The Division's programs include operation of ATLAS as a national user facility, nuclear structure and reaction research, nuclear theory, medium energy nuclear research and accelerator research and development. The mission of Nuclear Physics is to understand the origin, evolution and structure of baryonic matter in the universe--the matter that makes up stars, planets and human life itse… more
Date: March 12, 2007
Creator: Glover, J. & Physics
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

AdS/QCD and Its Holographic Light-Front Partonic Representation

Description: Starting from the Hamiltonian equation of motion in QCD we find a single variable light-front equation for QCD which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular momentum. This light-front wave equation is equivalent to the equations of motion which describe the propagation of spin-J modes on anti-de Sitter (AdS) space.
Date: November 12, 2008
Creator: de Teramond, Guy F. & Brodsky, Stanley J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Two-Loop Six-Point MHV Amplitude in Maximally Supersymmetric Yang-Mills Theory

Description: We give a representation of the parity-even part of the planar two-loop six-gluon MHV amplitude of N = 4 super-Yang-Mills theory, in terms of loop-momentum integrals with simple dual conformal properties. We evaluate the integrals numerically in order to test directly the ABDK/BDS all-loop ansatz for planar MHV amplitudes. We find that the ansatz requires an additive remainder function, in accord with previous indications from strong-coupling and Regge limits. The planar six-gluon amplitude can… more
Date: March 12, 2008
Creator: Bern, Z.; Dixon, L.J.; Kosower, D.A.; Roiban, R.; Spradlin, M.; Vergu, C. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Final Technical Report

Description: Using current methods, oil and gas in the subsurface cannot be reliably predicted from seismic data. This causes domestic oil and gas fields to go undiscovered and unexploited, thereby increasing the need to import energy. The general objective of this study was to demonstrate a simple and effective methodology for estimating reservoir properties (gas saturation in particular, but also including lithology, net to gross ratios, and porosity) from seismic attenuation and other attributes using P … more
Date: April 12, 2005
Creator: Walls, Joel; Uden, Richard; Singleton, Scott; Shu, Rone & Mavko, Gary
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Preliminary Analysis and Simulation Results of Microwave Transmission Through an Electron Cloud

Description: The electromagnetic particle-in-cell (PIC) code VORPAL is being used to simulate the interaction of microwave radiation through an electron cloud. The results so far showgood agreement with theory for simple cases. The study has been motivated by previous experimental work on this problem at the CERN SPS [1], experiments at the PEP-II Low Energy Ring (LER) at SLAC [4], and proposed experiments at the Fermilab Main Injector (MI). With experimental observation of quantities such as amplitude, pha… more
Date: January 12, 2007
Creator: Sonnad, Kiran; Sonnad, Kiran; Furman, Miguel; Veitzer, Seth; Stoltz, Peter & Cary, John
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

POLYMER ELECTROLYTE MEMBRANE ELECTROLYZER OPERATION WITH VARYING INLET WATER FEED CONFIGURATIONS

Description: Proton Exchange Membrane (PEM) electrolysis is a potential alternative technology to crack water in specialty applications where a dry gas stream is needed, such as isotope production. One design proposal is to feed the cathode of the electrolyzer with vapor phase water. This feed configuration would allow isotopic water to be isolated on the cathode side of the electrolyzer and the isotope recovery system could be operated in a closed loop. Tests were performed to characterize the difference i… more
Date: September 12, 2008
Creator: Fox, E
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Dynamic versus Static Structure Functions and Novel Diffractive Effects in QCD

Description: Initial- and final-state rescattering, neglected in the parton model, have a profound effect in QCD hard-scattering reactions, predicting single-spin asymmetries, diffractive deep inelastic scattering, diffractive hard hadronic reactions, the breakdown of the Lam Tung relation in Drell-Yan reactions, and nuclear shadowing and non-universal antishadowing--leading-twist physics not incorporated in the light-front wavefunctions of the target computed in isolation. I also discuss the use of diffrac… more
Date: November 12, 2008
Creator: Brodsky, Stanley J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Lean Burn Natural Gas Engine R&D

Description: The primary objective of this cooperative research is to develop and verify models of internal combustion engine spark ignition devices in order to improve combustion chamber fuel ignition characteristics and to improve spark plug durability. As a direct result of this joint research, a novel spark plug design was improved. A theory of spark arc motion was developed that explains experimentally observed effects not explained by other published theories. The knowledge developed by this research … more
Date: September 12, 2005
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An Arbitrary Lagrangian-Eulerian Discretization of MHD on 3D Unstructured Grids

Description: We present an arbitrary Lagrangian-Eulerian (ALE) discretization of the equations of resistive magnetohydrodynamics (MHD) on unstructured hexahedral grids. The method is formulated using an operator-split approach with three distinct phases: electromagnetic diffusion, Lagrangian motion, and Eulerian advection. The resistive magnetic dynamo equation is discretized using a compatible mixed finite element method with a 2nd order accurate implicit time differencing scheme which preserves the diverg… more
Date: June 12, 2006
Creator: Rieben, R. N.; White, D. A.; Wallin, B. K. & Solberg, J. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Reconnection in Spheromak formation and sustainment

Description: The Spheromak is a magnetic confinement device that is being explored in both the US and Japanese fusion programs. It is a member of the Compact Torus family of magnetic structures characterized by a set of closed, nested toroidal flux surfaces but without any coils, transformer cores, etc. protruding through the hole in the torus. The Speromak is closely elated to the Reversed Field Pinch (RFP) in that most of the magnetic field is produced by plasma currents flowing along the magnetic field l… more
Date: December 12, 1983
Creator: Hammer, J. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Weak scale supersymmetry

Description: An introduction to the ideas and current state of weak scale supersymmetry is given. It is shown that LEP data on Z decays has already excluded two of the most elegant models of weak scale supersymmetry. 14 refs.
Date: November 12, 1990
Creator: Hall, L. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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