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Visualization of Charge Distribution in a Lithium Battery Electrode

Description: We describe a method for direct determination and visualization of the distribution of charge in a composite electrode. Using synchrotron X-ray microdiffraction, state-of-charge profiles in-plane and normal to the current collector were measured. In electrodes charged at high rate, the signatures of nonuniform current distribution were evident. The portion of a prismatic cell electrode closest to the current collector tab had the highest state of charge due to electronic resistance in the compo… more
Date: July 2, 2010
Creator: Liu, Jun; Kunz, Martin; Chen, Kai; Tamura, Nobumichi & Richardson, Thomas J.
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Partner: UNT Libraries Government Documents Department
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The Value of Nu for Fission of U²³³ by 14 Mev Neutrons as Derived from Charge Distribution Measurements

Description: Abstract: "The charge distribution for fragments from fission of U-235 induced by 14 Mev neutrons, as given by Ford, has been examined to obtain the average number of neutrons per fission. On the basis of some assumptions which seem reasonable a value NU-5.2 +/- 0.5 is obtained. Some evidence is also given which points toward the validity of the Glendenin hypothesis of charge distribution as opposed to that of Present."
Date: 1958
Creator: Wahl, John S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Phase coexistence in multifragmentation?

Description: The charge (Z) distributions from intermediate energy heavy-ion reactions depend upon the multiplicity {eta} of intermediate mass fragments through a factor of the form e{sup {minus}cnZ}. Experimentally c starts from zero at low values of the transverse energy E{sub t} and reaches a saturation value at high E{sub t}. In a liquid-gas phase diagram, c = 0 for the saturated vapor, while c {gt} 0 for the unsaturated vapor. It is suggested that in the c {approx} 0 regime the source evaporates down t… more
Date: April 1, 1995
Creator: Moretto, L. G.; Phair, L. & Ghetti, R.
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Partner: UNT Libraries Government Documents Department
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Compact Analytic Expression for the Electric Field of a 2DElliptical Charge Distribution Inside a Perfectly Conducting CircularCylinder

Description: By combining the method of images with calculus of complex variables, we provide a simple expression for the electric field of a two-dimensional (2D) static elliptical charge distribution inside a perfectly conducting cylinder. The charge distribution need not be concentric with the cylinder.
Date: May 29, 2007
Creator: Furman, M. A.
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Partner: UNT Libraries Government Documents Department
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Coherent Beam-Beam Interactions in Electron-Positron Colliders

Description: We present the results of a new calculational technique that evaluates the beam-beam force due to an arbitrary charge distribution. We find coherent instabilities that dominate at certain operating points and depend strongly on the degree of damping in the system. We conclude that while these resonances may play a significant role for colliders with low damping, with a careful choice of operating points they should present no danger to the new generation of high luminosity heavy-quark factories… more
Date: August 1, 1991
Creator: Krishnagopal, S.
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Partner: UNT Libraries Government Documents Department
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Do phase transitions survive binomial reducibility and thermal scaling?

Description: First order phase transitions are described in terms of the microcanonical and canonical ensemble, with special attention to finite size effects. Difficulties in interpreting a `caloric curve` are discussed. A robust parameter indicating phase coexistence (univariance) or single phase (bivariance) is extracted for charge distributions. 9 refs., 4 figs.
Date: May 1, 1996
Creator: Moretto, L. G.; Phair, L. & Wozniak, G. J.
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Partner: UNT Libraries Government Documents Department
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TRANSVERSE WAKEFIELD EFFECTS IN THE TWO-BEAM ACCELERATOR

Description: Transverse wakefield effects in the high-gradient accelerating structure of the Two-Beam Accelerator (TBA) [1-3] are analyzed theoretically using three different models. The first is a very simple two-particle model due to Wilson [4]; the second, due to Chao, Richter, and Yao [5], is for a beam with uniform charge distribution, constant betatron wavelength, and a linear wake approximation. Both of these models give analytic scaling laws. The third model has a Gaussian beam (represented by 11 su… more
Date: August 1, 1985
Creator: Selph, F. & Sessler, A.
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Partner: UNT Libraries Government Documents Department
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Modeling of the phase evolution in Mg1-xAlxB2 (0<x<0.5) and its experimental signatures

Description: Despite the chemical and structural simplicity of MgB{sub 2}, at 39 K this compound has the highest known {Tc} of any binary compound. Electron doping by substituting Al for Mg leads to decreasing Tc and the observed concentration dependent rate of decrease has been proposed to arise from the non-ideal character of MgB{sub 2}-AIB{sub 2} solid solutions, which derives from the existence of an ordered Mg{sub 0.5}Al{sub 0.5}B{sub 2} compound. Heterogeneous nano-scale structure patterns in solid so… more
Date: January 1, 2009
Creator: Andersson, Anders David; Casillas, Luis; Lezama Pacheco, Juan & Conradson, Steven D
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Partner: UNT Libraries Government Documents Department
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A charge distribution analysis instrument for catalysis and material science applications. Third quarterly technical progress report, April 1, 1994--June 30, 1994

Description: Key component in the CDA instrument is the differential capacitive force sensor. The CDA instrument has four basic components: OEM analytical balance, flexure point and capacitor plates, gas confinement tower and high-voltage bias electrodes, and the furnace. Phyton is in position to purchase an OEM analytical balance; negotations are underway for obtaining the feedback control circuitry for the differential capacitive force sensor. Progress with the differential capacitive force sensor is revi… more
Date: August 5, 1994
Creator: Freund, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High-density nanopore array for selective biomolecule transport.

Description: Development of sophisticated tools capable of manipulating molecules at their own length scale enables new methods for chemical synthesis and detection. Although nanoscale devices have been developed to perform individual tasks, little work has been done on developing a truly scalable platform: a system that combines multiple components for sequential processing, as well as simultaneously processing and identifying the millions of potential species that may be present in a biological sample. Th… more
Date: November 1, 2011
Creator: Patel, Kamlesh D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Real-space formulation of the electrostatic potential and total energy of solids

Description: We develop expressions for the electrostatic potential and total energy of crystalline solids which are amenable to direct evaluation in real space. Unlike conventional reciprocal space formulations, no Fourier transforms or reciprocal lattice summations are required, and the formulation is well suited for large-scale, parallel computations. The need for reciprocal space expressions is eliminated by replacing long-range potentials by equivalent localized charge distributions and incorporating l… more
Date: May 12, 2004
Creator: Pask, J E & Sterne, P A
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Partner: UNT Libraries Government Documents Department
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Interpreting multiplicity-gated fragment distributions from heavy-ion collisions

Description: In recent years, multifragmentation of nuclear systems has been extensively studied, and many efforts have been made to clarify the underlying physics. However, no clear consensus exists on the mechanism for multifragmentation. Is the emission of intermediate mass fragments (IMF: 3 {le} Z {le} 20) a dynamical process (brought on by the occurrence of instabilities of one form or another) or a statistical process (i.e. the decay probabilities are proportional to a suitably defined exit channel ph… more
Date: February 1, 1997
Creator: Phair, L.; Moretto, L. G.; Rubehn, T.; Wozniak, G. J.; Beaulieu, L.; Tso, K. et al.
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Partner: UNT Libraries Government Documents Department
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The Brookhaven muon g-2 experiment

Description: A new experiment is being mounted at BNL to measure the anomalous magnet moment of the muon to 3 parts in 10{sup 7}. In this talk I will describe the physics issues that this precision allows us to explore, the experimental method, and an interesting new device which we will use to inject muons into our muon storage ring. The device is a 1.45T non-ferrous superconducting magnet, where all fringe field is contained by a superconducting sheet.
Date: March 1, 1995
Creator: Bunce, G.
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Partner: UNT Libraries Government Documents Department
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Effects of transverse beam size in beam position monitors.

Description: The fields produced by a long beam with a given transverse charge distribution in a homogeneous vacuum chamber are studied. Signals induced by the displaced finite-size beam on electrodes of a beam position monitor (BPM) are calculated and compared to those from a pencil beam. The non-linearities and corrections to BPM signals due to a finite transverse beam size are calculated for an arbitrary chamber cross section. Simple analytical expressions are given for a few particular transverse distri… more
Date: January 1, 2001
Creator: Kurennoy, S. (Sergey)
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Partner: UNT Libraries Government Documents Department
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Emittance Compensation for Magnetized Beams

Description: Emittance compensation is a well established technique for minimizing the emittance of an electron beam from a RF photo-cathode gun. Longitudinal slices of a bunch have a small emittance, but due to the longitudinal charge distribution of the bunch and time dependent RF fields they are not focused in the same way, so that the direction of their phase ellipses diverges in phase space and the projected emittance is much larger. Emittance compensation reverses the divergence. At the location where… more
Date: June 25, 2007
Creator: Kewisch, J. & Chang, X.
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Partner: UNT Libraries Government Documents Department
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Longitudinal electron bunch diagnostics using coherent transition radiation

Description: The longitudinal charge distribution of electron bunches in the Fermilab/Nicadd A0 photoinjector was determined using the coherent transition radiation produced by electrons passing through a thin metallic foil. The autocorrelation of the transition radiation signal was measured with a Michelson-type interferometer. The response function of the interferometer was determined from measured and simulated power spectra for low electron bunch charge and maximum longitudinal compression. A Kramers-Kr… more
Date: May 1, 2005
Creator: Mihalcea, D.; Bohn, C. L.; Happek, U. & Piot, P.
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Partner: UNT Libraries Government Documents Department
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Sensitivity of the CSR Self-Interaction to the Local Longitudinal Charge Concentration of an Electron Bunch

Description: Recent measurements of the coherent synchrotron radiation (CSR) effect carried out at CERN and at Jefferson Lab indicate that the observed emittance growth and energy modulation due to the orbit-curvature-induced bunch self-interaction are sometimes bigger than the results predicted from previous analyses and simulations based on a Gaussian longitudinal charge distribution. In this paper, by performing a model study, we show both analytically and numerically that when the longitudinal bunch cha… more
Date: August 1, 2000
Creator: Li, R.
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Partner: UNT Libraries Government Documents Department
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ECR-based atomic collision physics research at ORNL

Description: After a brief summary of the present capability and configuration of the ORNL Multicharged Ion Research Facility (MIRF), and of upcoming upgrades and expansions, the presently on-line atomic collisions experiments are described. In the process, the utility of intense, cw ion beams extracted from ECR ion sources for low-signal rate experiments is illustrated.
Date: April 1997
Creator: Meyer, F. W.; Bannister, M. E.; Hale, J. W. & Havener, C. C.
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Partner: UNT Libraries Government Documents Department
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Charge distribution analysis of catalysts under simulated reaction conditions. Fourth quarterly technical progress report, July 1--September 30, 1993

Description: Only moderate progress was made in collecting data using the Charge Distribution Analysis (CDA) apparatus. Initial runs performed with the furnace built on a boron nitride (BN) support showed unacceptable limitations. A new furnace design was immediately begun; the new microfurnace gave rapid heating and cooling rates almost 4 times faster than the BN furnace. Baseline data runs with fused silica were made.
Date: December 31, 1993
Creator: Freund, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Emittance growth and halo formation in a low energy proton beam

Description: We have measured emittances in a low-energy proton beam at energies between 19 and 45 KeV and currents between 9 and 39 mA. The rms emittance of the space-charge dominated proton beam, as measured by a moving-slit emittance probe, grew by an average amount of 60% in a propagation distance of 2.5 cm. An Abel inversion procedure was applied to the measured transverse charge distribution of the proton beam in order to calculate the electrostatic field energy, which is the driving quantity for emit… more
Date: April 1, 1993
Creator: Palkovic, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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