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10,261 Matching Results
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Luminosity Optimization With Offset, Crossing Angle, and Distortion
In a linear collider, sources of beam jitter due to kicker noise, quadrupole vibration and long-range transverse wakefields will lead to beam offsets and tilts at the Intersection Point (IP). In addition, sources of emittance dilution such as short-range transverse wakefields or dispersive errors will lead to internal beam distortions. When the IP disruption parameter is large, these beam imperfections will be amplified by a single bunch kink instability which will lead to luminosity loss. In this paper, we study the luminosity loss and then the optimization required to partially cancel the luminosity loss both analytically and with direct simulation.
Date:
June 15, 2005
Creator:
Wu, Juhao & Raubenheimer, T. O.
Object Type:
Article
System:
The UNT Digital Library
Observation of THz emission from a laser-plasma accelerated electron bunch crossing a plasma-vacuum boundary
Coherent radiation in the 0.3 - 3 THz range has been generated from femto second electron bunches at a plasma-vacuum boundary via transition radiation. The bunches produced by a laser-plasma accelerator contained 1.5 nC of charge. The THz energy per pulse within a limited 30 mrad collection angle was 3.5 nJ and scaled quadratically with bunch charge, consistent with coherent emission. Modeling indicates that this broadband source produces about 0.3 muJ per pulse within a 100 mrad angle, and that increasing the transverse plasma size and electron beam energy could provide more than 100 muj/pulse.
Date:
April 15, 2003
Creator:
Leemans, W. P.; Geddes, C. G. R.; Faure, J.; Toth, Cs.; van Tilborg, J.; Schroeder, C. B. et al.
Object Type:
Article
System:
The UNT Digital Library
California Tribal Nations Technical Water Research
This research focused on identifying the key technical water issues of federally recognized California Native American tribes, the context within which these water issues arise for the tribes, and an appropriate format for potentially opening further dialogue on water research issues between the tribes and Lawrence Livermore National Laboratory (LLNL) scientists. At LLNL, a Water Quality and Resource Management Issues Workshop held in January of 2003 resulted in multiple recommendations, one proposing a LLNL dialogue with California tribes to further inform LLNL's prioritization of water issues based on identified needs across national sectors. The focus of this aforementioned Water Quality and Resource Management Issues Workshop was to identify national and international priority water research issues with which LLNL may align their research efforts and contribute to resolving these needs. LLNL staff researched various sectors to delineate the key water issues associated with each. This preliminary water issue research included diverse entities such as international water agencies, federal and state agencies, industry, non-governmental agencies, and private organizations. The key (identified) water issues across these sectors were presented to workshop attendees and used during workshop debates and sessions. However, the key water issues of federally recognized Native American tribes remained less understood, …
Date:
August 15, 2005
Creator:
Ben, C & Coty, J
Object Type:
Report
System:
The UNT Digital Library
Ionization in Crossed Electric and Magnetic Fields
Both in magnetohydrodynamic shocks and in accelerated partially ionized gas flow across a magnetic field, space charge separation occurs that establishes very large electric fields in the direction of motion. The width of the current layers associated with the acceleration is never less than the electron Larmor radius with no collisions and is broadened by electron collisions to a width solely determined by the effective resistivity. The electrons gain an energy regardless of collisions equal to the electric potential difference across the layer. This potential corresponds to the change in kinetic energy of mass motion per ion. For slightly ionized gases, the additional stress of neutral ion collisions within the layer can make the electric potential and hence gain in electron energy very large for only modest changes in mass velocity. Hence ionization may occur when the change in kinetic energy of the ions is small compared to the ionization potential.
Date:
March 15, 1961
Creator:
Colgate, Stirling A.
Object Type:
Report
System:
The UNT Digital Library
Californio Voices: The Oral Memoirs of José María Amador and Lorenzo Asisara
Access:
Use of this item is restricted to the UNT Community
In the early 1870s, Hubert H. Bancroft and his assistants set out to record the memoirs of early Californios, one of them being eighty-three-year-old Don José María Amador, a former “Forty-Niner” during the California Gold Rush and soldado de cuera at the Presidio of San Francisco. Amador tells of reconnoitering expeditions into the interior of California, where he encountered local indigenous populations. He speaks of political events of Mexican California and the widespread confiscation of the Californios’ goods, livestock, and properties when the United States took control. A friend from Mission Santa Cruz, Lorenzo Asisara, also describes the harsh life and mistreatment the Indians faced from the priests. Both the Amador and Asisara narratives were used as sources in Bancroft’s writing but never published themselves. Gregorio Mora-Torres has now rescued them from obscurity and presents their voices in English translation (with annotations) and in the original Spanish on facing pages. This bilingual edition will be of great interest to historians of the West, California, and Mexican American studies. “This book presents a very convincing and interesting narrative about Mexican California. Its frankness and honesty are refreshing.”–Richard Griswold del Castillo, San Diego State University
Date:
April 15, 2005
Creator:
Gregorio Mora-Torres
Object Type:
Book
System:
The UNT Digital Library
Illegal Immigration: Border-Crossing Deaths Have Doubled Since 1995; Border Patrol's Efforts to Prevent Deaths Have Not Been Fully Evaluated.
A letter report issued by the Government Accountability Office with an abstract that begins "Reports in recent years have indicated that increasing numbers of migrants attempting to enter the United States illegally die while crossing the southwest border. The Border Patrol implemented the Border Safety Initiative (BSI) in 1998 with the intention of reducing injuries and preventing deaths among migrants that attempt to cross the border illegally. GAO assessed: (1) Trends in the numbers, locations, causes, and characteristics of border-crossing deaths. (2) Differences among the Border Patrol sectors in implementing the BSI methodology. (3) The extent to which existing data allow for an evaluation of the effectiveness of the BSI and other efforts to prevent border-crossing deaths."
Date:
August 15, 2006
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Final Scientific / Technical Report, Geothermal Resource Exploration Program, Truckhaven Area, Imperial County, California
With financial support from the U.S. Department of Energy (DOE), Layman Energy Associates, Inc. (LEA) has completed a program of geothermal exploration at the Truckhaven area in Imperial County, California. The exploratory work conducted by LEA included the following activities: compilation of public domain resource data (wells, seismic data, geologic maps); detailed field geologic mapping at the project site; acquisition and interpretation of remote sensing imagery such as aerial and satellite photographs; acquisition, quality control and interpretation of gravity data; and acquisition, quality control and interpretation of resistivity data using state of the art magnetotelluric (MT) methods. The results of this exploratory program have allowed LEA to develop a structural and hydrologic interpretation of the Truckhaven geothermal resource which can be used to guide subsequent exploratory drilling and resource development. Of primary significance, is the identification of an 8 kilometer-long, WNW-trending zone of low resistivity associated with geothermal activity in nearby wells. The long axis of this low resistivity zone is inferred to mark a zone of faulting which likely provides the primary control on the distribution of geothermal resources in the Truckhaven area. Abundant cross-faults cutting the main WNW-trending zone in its western half may indicate elevated fracture permeability …
Date:
August 15, 2006
Creator:
Layman Energy Associates, Inc.
Object Type:
Report
System:
The UNT Digital Library
The Western Outlook. (San Francisco, Oakland and Los Angeles, Calif.), Vol. 22, No. 17, Ed. 1 Saturday, January 15, 1916
Weekly African-American newspaper published in Oakland, California that includes local, state and national news along with extensive advertising.
Date:
January 15, 1916
Creator:
Francis, Joseph S. & Derrick, J. Lincoln
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 38, No. 227, Ed. 1 Friday, June 15, 2007
Free weekly newspaper that includes business and classified advertising.
Date:
June 15, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 42, No. 131, Ed. 1 Friday, April 15, 2011
Free weekly newspaper that includes business and classified advertising.
Date:
April 15, 2011
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 37, No. 539, Ed. 1 Friday, December 15, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
December 15, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 37, No. 383, Ed. 1 Friday, September 15, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
September 15, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 36, No. 119, Ed. 1 Friday, April 15, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
April 15, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
SNAP 10A-PSM-1: Test Results
Introduction: On November 14, 1961, an environmental test program commenced on the first SNAP 10A system structure, S10A-PSM-1.
Date:
July 15, 1964
Creator:
Oliva, R. M.
Object Type:
Report
System:
The UNT Digital Library
Alkali Deposits Found in Biomass Power Plants: A Preliminary Investigation of Their Extent and Nature. Volume 1
Alkali in the ash of annual crop biomass fuels creates serious fouling and slagging in conventional boilers. Even with the use of sorbents and other additives, power plants can only fire limited amounts of these fuels in combination with wood. The National Renewable Energy Laboratory (NREL), US Department of Energy, and the biomass power industry carried out eight full-scale firing tests and several laboratory experiments to study the nature and occurrence of deposits with the goal of increasing the quantities of these biofuels that can be used. This report describes the results of the laboratory and power plant tests that included: tracking and analyzing fuels and deposits by various methods; recording operating conditions; and extensive laboratory testing. The paper describes the occurrence of deposits, fuel and deposit analyses, boiler design and operation, fouling and slagging indicators, and recommendations. 37 refs., 41 figs., 17 tabs.
Date:
April 15, 1995
Creator:
Miles, T. R.; Miles Jr., T. R.; Baxter, L. L.; Bryers, R. W.; Jenkins, B. M. & Oden, L. L.
Object Type:
Report
System:
The UNT Digital Library
In-beam studies of high-spin states of actinide nuclei
High-spin states in the actinides have been studied using Coulomb- excitation, inelastic excitation reactions, and one-neutron transfer reactions. Experimental data are presented for states in {sup 232}U, {sup 233}U, {sup 234}U, {sup 235}U, {sup 238}Pu and {sup 239}Pu from a variety of reactions. Energy levels, moments-of-inertia, aligned angular momentum, Routhians, gamma-ray intensities, and cross-sections are presented for most cases. Additional spectroscopic information (magnetic moments, M{sub 1}/E{sub 2} mixing ratios, and g-factors) is presented for {sup 233}U. One- and two-neutron transfer reaction mechanisms and the possibility of band crossings (backbending) are discussed. A discussion of odd-A band fitting and Cranking calculations is presented to aid in the interpretation of rotational energy levels and alignment. In addition, several theoretical calculations of rotational populations for inelastic excitation and neutron transfer are compared to the data. Intratheory comparisons between the Sudden Approximation, Semi-Classical, and Alder-Winther-DeBoer methods are made. In connection with the theory development, the possible signature for the nuclear SQUID effect is discussed. 98 refs., 61 figs., 21 tabs.
Date:
November 15, 1990
Creator:
Stoyer, M.A. (Lawrence Berkeley Lab., CA (USA). Nuclear Science Div. California Univ., Berkeley, CA (USA). Dept. of Chemistry)
Object Type:
Report
System:
The UNT Digital Library
Design of the ILC Crab Cavity System
The International Linear Collider (ILC) has a 14 mrad crossing angle in order to aid extraction of spent bunches. As a result of the bunch shape at the interaction point, this crossing angle at the collision causes a large luminosity loss which can be recovered by rotating the bunches prior to collision using a crab cavity. The ILC baseline crab cavity is a 9-cell superconducting dipole cavity operating at a frequency of 3.9 GHz. In this paper the design of the ILC crab cavity and its phase control system, as selected for the RDR in February 2007 is described in fuller detail.
Date:
August 15, 2007
Creator:
Adolphsen, C.; Beard, C.; Bellantoni, L.; Burt, G.; Carter, R.; Chase, B. et al.
Object Type:
Report
System:
The UNT Digital Library
Instantiating a Global Network Measurement Framework
perfSONAR is a web services-based infrastructure for collecting and publishing network performance monitoring. A primary goal of perfSONAR is making it easier to solve end-to-end performance problems on paths crossing several networks. It contains a set of services delivering performance measurements in a federated environment. These services act as an intermediate layer, between the performance measurement tools and the diagnostic or visualization applications. This layer is aimed at making and exchanging performance measurements across multiple networks and multiple user communities, using well-defined protocols. This paper summarizes the key perfSONAR components, and describes how they are deployed by the US-LHC community to monitor the networks distributing LHC data from CERN. All monitoring data described herein is publicly available, and we hope the availability of this data via a standard schema will inspire others to contribute to the effort by building network data analysis applications that use perfSONAR.
Date:
December 15, 2008
Creator:
Tierney, Brian L.; Boote, Jeff; Boyd, Eric; Brown, Aaron; Grigoriev, Maxim; Metzger, Joe et al.
Object Type:
Report
System:
The UNT Digital Library
Recent advances of strong-strong beam-beam simulation
In this paper, we report on recent advances in strong-strong beam-beam simulation. Numerical methods used in the calculation of the beam-beam forces are reviewed. A new computational method to solve the Poisson equation on nonuniform grid is presented. This method reduces the computational cost by a half compared with the standard FFT based method on uniform grid. It is also more accurate than the standard method for a colliding beam with low transverse aspect ratio. In applications, we present the study of coherent modes with multi-bunch, multi-collision beam-beam interactions at RHIC. We also present the strong-strong simulation of the luminosity evolution at KEKB with and without finite crossing angle.
Date:
September 15, 2004
Creator:
Qiang, Ji; Furman, Miguel A.; Ryne, Robert D.; Fischer, Wolfram & Ohmi,Kazuhito
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0052.1148]
Photograph taken for a newspaper owned by the Oklahoma Publishing Company. Caption: "This Heavy blade was wrenched free and hurled through the air by the force of the crash. A 48-year-old street department employe was critically injured Saturday morning when his road grader was struck broadside by the engine of a 124-car Rock Island freight train at a crossing near SW Linn and California. Taken to Mercy hospital suffering from a severed right hand, concussion, severe head and internal injuries was Hubert J. Dickson sr., 301 SE 41. His condition was termed "very grave" by physicians. Dickson, according to witnesses, was pinned in the wreckage. His right arm was severed between the hand and elbow. The street department road grader was demolished in the grinding crash and wreckage was strewn along both sides of the railroad bed for several hundred feet. The engine of the train also was heavily damaged. Street department officials said Dickson had been operating the road grader on Linn street. He apparently did not see the approaching freight train in time to avoid the collision."
Date:
March 15, 1958
Creator:
Winford, Wesley
Object Type:
Photograph
System:
The Gateway to Oklahoma History
14 mrad Extraction Line Optics for Push-Pull
The ILC design is based on a single Interaction Region (IR) with 14 mrad crossing angle and two detectors in the 'push-pull' configuration, where the detectors can alternately occupy the Interaction Point (IP). Consequently, the IR optics must be compatible with different size detectors designed for different distance L* between the IP and the nearest quadrupole. This paper presents the push-pull optics for the ILC extraction line compatible with L*= 3.5 m to 4.5 m, and the simulation results of extraction beam loss at 500 GeV CM with detector solenoid.
Date:
October 15, 2007
Creator:
Nosochkov, Y.; Moffeit, K.; Seryi, A.; Morse, W. & Parker, B.
Object Type:
Article
System:
The UNT Digital Library
An asymptotic model of seismic reflection from a permeable layer
Analysis of compression wave propagation in a poroelastic medium predicts a peak of reflection from a high-permeability layer in the low-frequency end of the spectrum. An explicit formula expresses the resonant frequency through the elastic moduli of the solid skeleton, the permeability of the reservoir rock, the fluid viscosity and compressibility, and the reservoir thickness. This result is obtained through a low-frequency asymptotic analysis of Biot's model of poroelasticity. A review of the derivation of the main equations from the Hooke's law, momentum and mass balance equations, and Darcy's law suggests an alternative new physical interpretation of some coefficients of the classical poroelasticity. The velocity of wave propagation, the attenuation factor, and the wave number, are expressed in the form of power series with respect to a small dimensionless parameter. The absolute value of this parameter is equal to the product of the kinematic reservoir fluid mobility and the wave frequency. Retaining only the leading terms of the series leads to explicit and relatively simple expressions for the reflection and transmission coefficients for a planar wave crossing an interface between two permeable media, as well as wave reflection from a thin highly-permeable layer (a lens). Practical applications of the obtained …
Date:
October 15, 2009
Creator:
Silin, D. & Goloshubin, G.
Object Type:
Article
System:
The UNT Digital Library
Compact Superconducting Final Focus Magnet Options for the ILC
The QD0 quadrupole, the final focus magnet closest to the Interaction Point (IP) for the ILC 20 mr crossing angle layout, must provide strong focusing yet be adjustable to accommodate collision energy changes for energy scans and low energy calibration running. It must also be compact to allow disrupted beam and Beamstrahlung coming from the IP to pass outside into an independent instrumented beam line that leads to a high-power beam absorber. In designing QD0 we take advantage of recent BNL experience making direct wind superconducting magnets. Here we review important considerations for the present design, report on progress producing a prototype, describe our compact quadrupole concept in greater detail, and relate this work to other ILC design challenges.
Date:
March 15, 2006
Creator:
Parker, B.; Anerella, M.; Escallier, J.; Harrison, M.; He, P.; Jain, A. K. et al.
Object Type:
Article
System:
The UNT Digital Library
Garland News. (Garland, Tex.), Vol. 19, No. 23, Ed. 1 Friday, September 15, 1905
Weekly newspaper from Garland, Texas that includes local, state, and national news along with advertising.
Date:
September 15, 1905
Creator:
Holford, Will A.
Object Type:
Newspaper
System:
The Portal to Texas History