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Bremsstrahlung from high Z impurities in hot plasmas
This is a study of the effect of core electron and plasma screening on Bremsstrahlung from high-Z impurities in hot plasmas. 3 refs., 7 figs., 1 tab.
Date:
May 9, 1988
Creator:
DeWitt, H.; Rogers, F. & Iglesias, C.
Object Type:
Report
System:
The UNT Digital Library
Diagnosing the PEP-II Injection System
The injection of beam into the PEP-II B-Factory, especially into the High Energy Ring (HER) has some challenges. A high background level in the BaBar detector has for a while inhibited us from trickling charge into the HER similar to the Low Energy Ring (LER). Analyzing the injection system has revealed many issues which could be improved. The injection bump between two kickers was not closed, mainly because the phase advance wasn't exactly 180{sup o} and the two kicker strengths were not balanced. Additionally we found reflections which kick the stored beam after the main kick and cause the average luminosity to drop about 3% for a 10 Hz injection rate. The strength of the overall kick is nearly twice as high as the design, indicating a much bigger effective septum thickness. Compared with single beam the background is worse when the HER beam is colliding with the LER beam. This hints that the beam-beam force and the observed vertical blow-up in the HER pushes the beam and especially the injected beam further out to the edge of the dynamic aperture or beyond.
Date:
May 9, 2005
Creator:
Decker, F. -J.; Donald, M. H.; Iverson, R. H.; Kulikov, A.; Pappas, G. C. & Weaver, M.
Object Type:
Article
System:
The UNT Digital Library
Identifying Lattice, Orbit, And BPM Errors in PEP-II
The PEP-II B-Factory is delivering peak luminosities of up to 9.2 {center_dot} 10{sup 33} 1/cm{sup 2} {center_dot} l/s. This is very impressive especially considering our poor understanding of the lattice, absolute orbit and beam position monitor system (BPM). A few simple MATLAB programs were written to get lattice information, like betatron functions in a coupled machine (four all together) and the two dispersions, from the current machine and compare it the design. Big orbit deviations in the Low Energy Ring (LER) could be explained not by bad BPMs (only 3), but by many strong correctors (one corrector to fix four BPMs on average). Additionally these programs helped to uncover a sign error in the third order correction of the BPM system. Further analysis of the current information of the BPMs (sum of all buttons) indicates that there might be still more problematic BPMs.
Date:
May 9, 2005
Creator:
Decker, F.-J.
Object Type:
Article
System:
The UNT Digital Library
Lattice Effects Due to High Currents in PEP-II
The very high beam currents in the PEP-II B-Factory have caused many expected and unexpected effects: Synchrotron light fans move the beam pipe and cause dispersion; higher order modes cause excessive heating, e-clouds around the positron beam blow up its beam size. Here we describe an effect where the measured dispersion of the beam in the Low Energy Ring (LER) is different at high and at low beam currents. The dispersion was iteratively lowered by making anti-symmetric orbit bumps in many sextupole duplets, checking each time with a dispersion measurement where a dispersive kick is generated. This can be done parasitically during collisions. It was a surprise when checking the low current characterization data that there is a change. Subsequent high and low current measurements confirmed the effect. One source was believed to be located far away from any synchrotron radiation in the middle of a straight (PR12), away from sextupoles and skew quadrupoles and created a dispersion wave of about 70 mm at high current while at low current it is negligible.
Date:
May 9, 2005
Creator:
Decker, F.-J.; Smith, H. & Turner, J.L.
Object Type:
Article
System:
The UNT Digital Library
Large P sub t jets at CDF
The inclusive jet cross section and the dijet mass spectrum have been measured at the Fermilab Tevatron Collider at {radical}s = 1.8 TeV. These measurements span approximately 7 orders of magnitude in cross section and contain jets up to 400 GeV in transverse energy and dijet masses up to 950 GeV. Comparisons have been made to QCD at both orders {alpha}{sub s}{sup 2} and {alpha}{sub s}{sup 3}. 8 refs., 9 figs.
Date:
May 9, 1990
Creator:
Dell'Orso, M. (Pisa Univ. (Italy). Dipt. di Fisica)
Object Type:
Article
System:
The UNT Digital Library
Neutron scattering studies of RENi{sub 2}B{sub 2}C: Magnetic structures and lattice dynamics
Neutron scattering techniques have been used to study the magnetic structure and lattice dynamical properties of various members of the recently discovered RENi{sub 2}B{sub 2}C family, were RE stands for a rare-earth element. The magnetic structures of superconducting DyNi{sub 2}B{sub 2}C, ErNi{sub 2}B{sub 2}C, HoNi{sub 2}B{sub 2}C, and non superconducting TbNi{sub 2}B{sub 2}C have been determined as a function of temperature, in the 2-300 K temperature range.
Date:
May 9, 1996
Creator:
Dervenagas, P.
Object Type:
Report
System:
The UNT Digital Library
Waveguide Coupler for X-Band Deflectors
Technology developed for the NLC and for recent high gradient research may help building advanced {approx}fs beam diagnostics.
Date:
May 9, 2011
Creator:
Dolgashev, Valery
Object Type:
Article
System:
The UNT Digital Library
Modifications of the LCLS Photoinjector Beamline
The LCLS Photoinjector beamline is now in the Design and Engineering stage. The fabrication and installation of this beamline is scheduled for the summer 2006. The Photoinjector will deliver 10 ps long electron bunches of 1nC with a normalized transverse emittance of less than 1 mm.mrad for 80% of the slices constituting the core of the bunch at 135 MeV. The calculations done to finalize the specifications of the photoinjector beamline components are described. Modifications include a new exit energy, additional focusing between the two linac modules, the insertion of a ''laser heater'', and a new geometry for the coupling cells of the RF structures. We also discuss two interesting tunings, one for the nominal charge of 1nC but using a longer laser pulse and the second one for a lower charge of 0.2nC. Sensitivity to field errors and misalignment for those two new configurations is compared to that of the nominal tuning.
Date:
May 9, 2005
Creator:
Dowell, D.; Gierman, S.M. & Limborg-Deprey, C.
Object Type:
Article
System:
The UNT Digital Library
Blowpipe.
Patent for an improved blowpipe (or hydrocarbon torch), which when activated causes "an extremely hot needle flame" for a Bunsen burner (lines 18-19). Patent contains an illustration and instructions.
Date:
May 9, 1916
Creator:
Downie, James H.
Object Type:
Patent
System:
The Portal to Texas History
Crime and Forfeiture
This report provides information about Crime and Forfeiture. Forfeiture has been an effective law enforcement tool. Modern Forfeiture follows one of the two procedural routes.
Date:
May 9, 2007
Creator:
Doyle, Charles
Object Type:
Report
System:
The UNT Digital Library
Crime and Forfeiture: In Short
This is a sketch of the federal forfeiture, the confiscation that attends the commission of various crimes, of its origins and attributes, of the distribution through asset forfeiture funds of the hundreds of millions of dollars it generates., and of some of the constitutional issues, it raises.
Date:
May 9, 2007
Creator:
Doyle, Charles
Object Type:
Report
System:
The UNT Digital Library
The SAFE Acts of 2005: H.R. 1526 and S. 737--A Sketch
None
Date:
May 9, 2005
Creator:
Doyle, Charles
Object Type:
Report
System:
The UNT Digital Library
Security and Freedom Ensured Act (SAFE Act)(H.R. 1526) and Security and Freedom Enhancement Act (SAFE Act)(S. 737): Section by Section Analysis
None
Date:
May 9, 2005
Creator:
Doyle, Charles
Object Type:
Report
System:
The UNT Digital Library
Supervised Release: An Abbreviated Outline of Federal Law
None
Date:
May 9, 2006
Creator:
Doyle, Charles
Object Type:
Report
System:
The UNT Digital Library
Reduction of size of water passages by thermal expansion: W pile
None
Date:
May 9, 1944
Creator:
Drew, T. B. & Woods, W. K.
Object Type:
Report
System:
The UNT Digital Library
The Argonne Leadership Computing Facility 2010 Annual Report.
Researchers found more ways than ever to conduct transformative science at the Argonne Leadership Computing Facility (ALCF) in 2010. Both familiar initiatives and innovative new programs at the ALCF are now serving a growing, global user community with a wide range of computing needs. The Department of Energy's (DOE) INCITE Program remained vital in providing scientists with major allocations of leadership-class computing resources at the ALCF. For calendar year 2011, 35 projects were awarded 732 million supercomputer processor-hours for computationally intensive, large-scale research projects with the potential to significantly advance key areas in science and engineering. Argonne also continued to provide Director's Discretionary allocations - 'start up' awards - for potential future INCITE projects. And DOE's new ASCR Leadership Computing (ALCC) Program allocated resources to 10 ALCF projects, with an emphasis on high-risk, high-payoff simulations directly related to the Department's energy mission, national emergencies, or for broadening the research community capable of using leadership computing resources. While delivering more science today, we've also been laying a solid foundation for high performance computing in the future. After a successful DOE Lehman review, a contract was signed to deliver Mira, the next-generation Blue Gene/Q system, to the ALCF in 2012. The ALCF …
Date:
May 9, 2011
Creator:
Drugan, C.
Object Type:
Report
System:
The UNT Digital Library
Demonstration of the Military Ecological Risk Assessment Framework (MERAF): Apache Longbow - Hell Missile Test at Yuma Proving Ground
This ecological risk assessment for a testing program at Yuma Proving Ground, Arizona, is a demonstration of the Military Ecological Risk Assessment Framework (MERAF; Suter et al. 2001). The demonstration is intended to illustrate how risk assessment guidance concerning-generic military training and testing activities and guidance concerning a specific type of activity (e.g., low-altitude aircraft overflights) may be implemented at a military installation. MERAF was developed with funding from the Strategic Research and Development Program (SERDP) of the Department of Defense. Novel aspects of MERAF include: (1) the assessment of risks from physical stressors using an ecological risk assessment framework, (2) the consideration of contingent or indirect effects of stressors (e.g., population-level effects that are derived from habitat or hydrological changes), (3) the integration of risks associated with different component activities or stressors, (4) the emphasis on quantitative risk estimates and estimates of uncertainty, and (5) the modularity of design, permitting components of the framework to be used in various military risk assessments that include similar activities. The particular subject of this report is the assessment of ecological risks associated with a testing program at Cibola Range of Yuma Proving Ground, Arizona. The program involves an Apache Longbow helicopter firing …
Date:
May 9, 2002
Creator:
Efroymson, R.A.
Object Type:
Report
System:
The UNT Digital Library
Computational fluid dynamics simulations of a glass melting furnace
The glass production industry is one of the major users of natural gas in the US, and approximately 75% of the energy produced from natural gas is used in the melting process. Industrial scale glass melting furnaces are large devices, typically 5 or more meters wide, and twice as long. To achieve efficient heat transfer to the glass melt below, the natural gas flame must extend over a large portion of the glass melt. Therefore modern high efficiency burners are not used in these furnaces. The natural gas is injected as a jet, and a jet flame forms in the flow of air entering the furnace. In most current glass furnaces the energy required to melt the batch feed stock is about twice the theoretical requirement. An improved understanding of the heat transfer and two phase flow processes in the glass melt and solid batch mix offers a substantial opportunity for energy savings and consequent emission reductions. The batch coverage form and the heat flux distribution have a strong influence on the glass flow pattern. This flow pattern determines to a significant extent the melting rate and the quality of glass.
Date:
May 9, 2000
Creator:
Egelja, A. & Lottes, S. A.
Object Type:
Article
System:
The UNT Digital Library
Reducing Water Freshwater Consumption at Coal-Fired Power Plants : Approaches Used Outside the United States.
Coal-fired power plants consume huge quantities of water, and in some water-stressed areas, power plants compete with other users for limited supplies. Extensive use of coal to generate electricity is projected to continue for many years. Faced with increasing power demands and questionable future supplies, industries and governments are seeking ways to reduce freshwater consumption at coal-fired power plants. As the United States investigates various freshwater savings approaches (e.g., the use of alternative water sources), other countries are also researching and implementing approaches to address similar - and in many cases, more challenging - water supply and demand issues. Information about these non-U.S. approaches can be used to help direct near- and mid-term water-consumption research and development (R&D) activities in the United States. This report summarizes the research, development, and deployment (RD&D) status of several approaches used for reducing freshwater consumption by coal-fired power plants in other countries, many of which could be applied, or applied more aggressively, at coal-fired power plants in the United States. Information contained in this report is derived from literature and Internet searches, in some cases supplemented by communication with the researchers, authors, or equipment providers. Because there are few technical, peer-reviewed articles on this …
Date:
May 9, 2011
Creator:
Elcock, D.
Object Type:
Report
System:
The UNT Digital Library
Federal Aviation Administration Reauthorization: An Overview of Selected Provisions in Proposed Legislation
This report is intended to provide a brief summary and analysis of major legislative provisions under consideration in the ongoing Federal Aviation Administration reauthorization process. The report is organized into six major program areas: aviation system finance; airport finance; FAA management and organizational issues; system capacity and safety; environmental issues; and miscellaneous programs and provisions. In several cases, provisions that appear in various unrelated sections of proposed legislation have been rearranged in this report in an effort to group and discuss related items in an issue-driven or programmatic context. Since this report is primarily written as a means of communicating key legislative provisions under consideration in the ongoing FAA reauthorization process, it does not go into detail regarding the specific policy issues behind these legislative proposals.
Date:
May 9, 2008
Creator:
Elias, Bart; Fischer, John W.; Kirk, Robert S.; Luther, Linda; Vincent, Carol Hardy; McCarthy, James E. et al.
Object Type:
Report
System:
The UNT Digital Library
Transportation Security: Issues for the 114th Congress
This report examines aviation, transit and passenger rail security, as well as port and maritime security. The difficulty and cost of protecting the transportation sector from attack raises a core question for policymakers, i.e., how much effort and resources to put toward protecting potential targets versus pursuing and fighting terrorists.
Date:
May 9, 2016
Creator:
Elias, Bart; Peterman, David R. & Frittelli, John
Object Type:
Report
System:
The UNT Digital Library
Comparison of Rights in Military Commission Trials and Trials in Federal Criminal Court
The initiation of military commission proceedings against Khalid Sheik Mohammad and four others for their alleged involvement in the 9/11 terrorist attacks has focused renewed attention on the differences between trials in federal court and those conducted by military commission. This report provides a brief summary of legal issues raised by the choice of forum for trying accused terrorists and a chart comparing selected military commissions rules under the Military Commissions Act, as amended, to the corresponding rules that apply in federal court.
Date:
May 9, 2012
Creator:
Elsea, Jennifer K.
Object Type:
Report
System:
The UNT Digital Library
Peak Current Optimization for LCLS Bunch Compressor 2
In this study, we calculate the effects of Coherent Synchrotron Radiation (CSR) in the LCLS bunch compression section BC2[3] on the resulting FEL performance, considering a realistic, strongly non-gaussian longitudinal charge distribution. The longitudinal chirping required for the bunch compression process leads to a non-linear, non-monotonous {delta}(z) functional dependence (Fig. 1 shows the current distribution and the energy offset along the bunch). We model this functional dependence by matching it to a cubic polynomial {delta} {approx} c{sub 0} + c{sub 1}z + c{sub 2}z{sup 2} + c{sub 3}z{sup 3}. During compression, the charge distribution in the z-{delta} plane will ''fold over'', as shown in fig. 2. This leads to a cusp at each end of the current distribution I(z), as shown in figure 3. High |l'(z)| values will lead to high longitudinal CSR fields, with possible detrimental effects on the transverse projected and slice emittance as well as energy spread, possibly affecting FEL performance.
Date:
May 9, 2005
Creator:
Emma, P. & Kabel, A. C.
Object Type:
Article
System:
The UNT Digital Library
Computation of the Longitudinal Space Charge Effect in Photoinjectors
The LCLS Photoinjector produces a 100A, 10 ps long electron bunch which is later compressed down to 230 fs to produce the peak current required for generating SASE radiation. SASE saturation will be reached in the LCLS only if the emittance and uncorrelated energy spread remain respectively below 1.2 mm.mrad and 5.10{sup -4}. This high beam quality will not be met if the Longitudinal Space Charge (LSC) instability develops in the injector and gets amplified in the compressors. The LSC instability originates in the injector beamline, from an initial modulation on top of the photoelectron pulse leaving the cathode. Numerical computations, performed with Multiparticle Space Charge tracking codes, showing the evolution of the longitudinal phase space along the LCLS injector beamline, are discussed. Their results are compared with those deduced from theoretical models in different regimes of energy and acceleration and for different modulation wavelengths. This study justifies the necessity to insert a ''laser heater'' in the LCLS Photoinjector beamline.
Date:
May 9, 2005
Creator:
Emma, P.; Huang, Z.; Limborg-Deprey, C.; Welch, J. J. & Wu, J.
Object Type:
Article
System:
The UNT Digital Library