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Pump Side-scattering in Ultra-powerful Backward Raman Amplifiers
Extremely large laser power might be obtained by compressing laser pulses through backward Raman amplification (BRA) in plasmas. Premature Raman backscattering of a laser pump by plasma noise might be suppressed by an appropriate detuning of the Raman resonance, even as the desired amplification of the seed persists with a high efficiency. In this paper, we analyze side-scattering of laser pumps by plasma noise in backward Raman amplifiers. Though its growth rate is smaller than that of backscattering, the side-scattering can nevertheless be dangerous, because of a longer path of side-scattered pulses in plasmas and because of an angular dependence of the Raman resonance detuning. We show that side-scattering of laser pumps by plasma noise in BRA might be suppressed to a tolerable level at all angles by an appropriate combination of two detuning mechanisms associated with plasma density gradient and pump chirp.
Date:
March 2, 2004
Creator:
A.A. Solodov, V.M. Malkin, and N.J. Fisch
Object Type:
Report
System:
The UNT Digital Library
PROPOSAL FOR A SILICON VERTEX TRACKER (VTX) FOR THE PHENIX EXPERIMENT.
We propose the construction of a Silicon Vertex Tracker (VTX) for the PHENIX experiment at RHIC. The VTX will substantially enhance the physics capabilities of the PHENIX central arm spectrometers. Our prime motivation is to provide precision measurements of heavy-quark production (charm and beauty) in A+A, p(d)+A, and polarized p+p collisions. These are key measurements for the future RHIC program, both for the heavy ion program as it moves from the discovery phase towards detailed investigation of the properties of the dense nuclear medium created in heavy ion collisions, and for the exploration of the nucleon spin-structure functions. In addition, the VTX will also considerably improve other measurements with PHENIX. The main physics topics addressed by the VTX are: (1) Hot and dense strongly interacting matter--Potential enhancement of charm production; Open beauty production; Flavor dependence of jet quenching and QCD energy loss; Accurate charm reference for quarkonium; Thermal dilepton radiation; High p{sub T} phenomena with light flavors above 10-15 GeV/c in p{sub T}; and Upsilon spectroscopy in the e{sup +}e{sup -} decay channel. (2) Gluon spin structure of the nucleon--{Delta}G/G with charm; {Delta}G/G with beauty; and x dependence of {Delta}G/G with {gamma}-jet correlations. (3) Nucleon structure in nuclei--Gluon shadowing over …
Date:
March 30, 2004
Creator:
AKIBA,Y.
Object Type:
Report
System:
The UNT Digital Library
Cultural Resources Survey Within the Green Acres South Campus Proposed Expansion Site
Archaeological survey results of 34 acre area of land for proposed development in Smith County, Texas.
Date:
March 22, 2004
Creator:
AR Consultants
Object Type:
Report
System:
The Portal to Texas History
Search for b0(s) --> mu+ mu- and b0(d) --> mu+ mu- decays in p anti-p collisions at s**(1/2) = 1.96 tev
The authors report on a search for B{sub s}{sup 0} {yields} {mu}{sup +}{mu}{sup -} and B{sub d}{sup 0} {yields} {mu}{sup +}{mu}{sup -} decays in p{bar p} collisions at {radical}s = 1.96 TeV using 171 pb{sup -1} of data collected by the CDF II experiment at the Fermilab Tevatron Collider. The decay rates of these rare processes are sensitive to contributions from physics beyond the Standard Model. One event survives all the selection requirements, consistent with the background expectation. They derive branching ratio limits of {Beta}(B{sub s}{sup 0} {yields} {mu}{sup +}{mu}{sup -}) < 5.8 x 10{sup -7} and {Beta}(B{sub d}{sup 0} {yields} {mu}{sup +}{mu}{sup -}) < 1.5 x 10{sup -7} at 90% confidence level.
Date:
March 20, 2004
Creator:
Acosta, D.
Object Type:
Report
System:
The UNT Digital Library
Tracing Geothermal Fluids
Geothermal water must be injected back into the reservoir after it has been used for power production. Injection is critical in maximizing the power production and lifetime of the reservoir. To use injectate effectively the direction and velocity of the injected water must be known or inferred. This information can be obtained by using chemical tracers to track the subsurface flow paths of the injected fluid. Tracers are chemical compounds that are added to the water as it is injected back into the reservoir. The hot production water is monitored for the presence of this tracer using the most sensitive analytic methods that are economically feasible. The amount and concentration pattern of the tracer revealed by this monitoring can be used to evaluate how effective the injection strategy is. However, the tracers must have properties that suite the environment that they will be used in. This requires careful consideration and testing of the tracer properties. In previous and parallel investigations we have developed tracers that are suitable from tracing liquid water. In this investigation, we developed tracers that can be used for steam and mixed water/steam environments. This work will improve the efficiency of injection management in geothermal fields, lowering …
Date:
March 1, 2004
Creator:
Adams, Michael C. & Nash, Greg
Object Type:
Report
System:
The UNT Digital Library
Characterization of Environmental Stability of Pulsed Laser Deposited Oxide Ceramic Coatings
A systematic investigation of candidate hydrogen permeation materials applied to a substrate using Pulsed Laser Deposition has been performed. The investigation focused on application of leading permeation-resistant materials types (oxide, carbides, and metals) on a stainless steel substrate. and evaluation of the stability of the applied coatings. Type 304L stainless steel substrates were coated with aluminum oxide, chromium oxide, and aluminum. Characterization of the coating-substrate system adhesion was performed using scratch adhesion testing and microindentation. Coating stability and environmental susceptibility were evaluated for two conditions-air at 350 degrees Celsius and Ar-H2 at 350 degrees Celsius for up to 100 hours. Results from this study have shown the pulsed laser deposition process to be an extremely versatile technology that is capable of producing a sound coating/substrate system for a wide variety of coating materials.
Date:
March 2, 2004
Creator:
Adams, Thad M.
Object Type:
Article
System:
The UNT Digital Library
Doctoral Recital: 2004-03-08 – Michael Adduci, oboe
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
March 8, 2004
Creator:
Adduci, Michael
Object Type:
Sound
System:
The UNT Digital Library
Development of New Low-Cost, High-Performance, PV Module Encapsulant/Packaging Materials: Annual Technical Progress Report, Phase 1, 22 October 2002-30 September 2003
The primary objectives of this subcontract are for Specialized Technology Resources, Inc., to work with U.S.-based PV module manufacturers representing crystalline silicon, polycrystalline silicon, amorphous silicon, copper indium diselenide (CIS), and other state-of-the-art thin-film technologies to develop formulations, production processes, prototype and qualify new low-cost, high-performance photovoltaic module encapsulants/packaging materials. The manufacturers will assist in identifying each materials' deficiencies while undergoing development, and then ultimately in qualifying the final optimized materials designed to specifically meet their requirements. Upon completion of this program, new low-cost, high-performance, PV module encapsulant/packaging materials will be qualified, by one or more end-users, for their specific application. Information gathering on topics related to thin-film module technology, including device performance/failure analysis, glass stability, and de vice encapsulation, has been completed. This information has provided concepts and considerations for module failure analysis, accelerated testing design, and encapsulation formulation strategy for thin-film modules.
Date:
March 1, 2004
Creator:
Agro, S. C. & Tucker, R. T.
Object Type:
Report
System:
The UNT Digital Library
Final-part metrology for LIGA springs, Build Group 1.
The LIGA spring is a recently designed part for defense program applications. The Sandia California LIGA team has produced an initial group build of these nickel alloy parts. These are distinctive in having a macroscopic lateral size of about 1 cm, while requiring microscopic dimensional precision on the order of a few micrometers. LIGA technology capabilities at Sandia are able to manufacture such precise structures. While certain aspects of the LIGA process and its production capabilities have been dimensionally characterized in the past, [1-6] the present work is exclusive in defining a set of methods and techniques to inspect and measure final LIGA nickel alloy parts in large prototype quantities. One hundred percent inspection, meaning that every single LIGA part produced needs to be measured, ensures quality control and customer satisfaction in this prototype production run. After a general visual inspection of the parts and an x-ray check for voids, high precision dimensional metrology tools are employed. The acquired data is analyzed using both in house and commercially available software. Examples of measurements illustrating these new metrology capabilities are presented throughout the report. These examples furthermore emphasize that thorough inspection of every final part is not only essential to characterize …
Date:
March 1, 2004
Creator:
Aigeldinger, Georg; Skala, Dawn M.; Ceremuga, Joseph T. & Mills, Bernice E.
Object Type:
Report
System:
The UNT Digital Library
Reduction of U(VI) Complexes by Anthraquinone Disulfonate: Experiment and Molecular Modeling
Past studies demonstrate that complexation will limit abiotic and biotic U(VI) reduction rates and the overall extent of reduction. However, the underlying basis for this behavior is not understood and presently unpredictable across species and ligand structure. The central tenets of these investigations are: (1) reduction of U(VI) follows the electron-transfer (ET) mechanism developed by Marcus; (2) the ET rate is the rate-limiting step in U(VI) reduction and is the step that is most affected by complexation; and (3) Marcus theory can be used to unify the apparently disparate U(VI) reduction rate data and as a computational tool to construct a predictive relationship.
Date:
March 17, 2004
Creator:
Ainsworth, C. C.; Wang, Z.; Rosso, K. M.; Wagnon, K. & Fredrickson, J. K.
Object Type:
Presentation
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 9, Ed. 1 Thursday, March 4, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
March 4, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 10, Ed. 1 Thursday, March 11, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
March 11, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 11, Ed. 1 Thursday, March 18, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
March 18, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 13, Ed. 1 Thursday, March 25, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
March 25, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Oral History Interview with John Alison, March 7, 2004
The National Museum of the Pacific War presents an oral interview with John Alison. Alsion was born in Florida in 1912 and graduated from the University of Florida. Soon after graduation he was accepted into the Army Flying School at Randolph Field, Texas. After competing primary flight training he moved to Kelly Field, Texas for advanced training and was selected to fly fighters. Upon receiving his wings in 1937 he was ordered to report to Langley Field, Virginia where he was assigned to the 8th Pursuit Group flying the PB2A pursuit plane. In 1940 the group moved to Mitchell, Field, New York and the 57th Pursuit Group was formed. Alison was named squadron commander of the 66th Pursuit Squadron. He was directed to demonstrate the Curtis P-40 fighter to General Claire Chennault and a group of Chinese generals. He describes his flight demonstration and the obvious satisfaction of shown by all concerned. In April 1941, he went to England with the Hubert Zemke to assist the Royal Air Force in the integration of the P-40 into the RAF. While there, he was selected to accompany American Ambassador Harry Hopkins as a military attaché of the US Embassy in Moscow. He …
Date:
March 7, 2004
Creator:
Alison, John R.
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with John Alison, March 7, 2004
The National Museum of the Pacific War presents an oral interview with John Alison. Alsion was born in Florida in 1912 and graduated from the University of Florida. Soon after graduation he was accepted into the Army Flying School at Randolph Field, Texas. After competing primary flight training he moved to Kelly Field, Texas for advanced training and was selected to fly fighters. Upon receiving his wings in 1937 he was ordered to report to Langley Field, Virginia where he was assigned to the 8th Pursuit Group flying the PB2A pursuit plane. In 1940 the group moved to Mitchell, Field, New York and the 57th Pursuit Group was formed. Alison was named squadron commander of the 66th Pursuit Squadron. He was directed to demonstrate the Curtis P-40 fighter to General Claire Chennault and a group of Chinese generals. He describes his flight demonstration and the obvious satisfaction of shown by all concerned. In April 1941, he went to England with the Hubert Zemke to assist the Royal Air Force in the integration of the P-40 into the RAF. While there, he was selected to accompany American Ambassador Harry Hopkins as a military attaché of the US Embassy in Moscow. He …
Date:
March 7, 2004
Creator:
Alison, John R.
Object Type:
Text
System:
The Portal to Texas History
Nanoscience Research for Energy Needs. Report of the National Nanotechnology Initiative Grand Challenge Workshop, March 16-18, 2004
This document is the report of a workshop held under NSET auspices in March 2004 aimed at identifying and articulating the relationship of nanoscale science and technology to the Nation's energy future.
Date:
March 18, 2004
Creator:
Alivisatos, P.; Cummings, P.; De Yoreo, J.; Fichthorn, K.; Gates, B.; Hwang, R. et al.
Object Type:
Report
System:
The UNT Digital Library
Laser Ion Acceleration from the Interaction of Ultra-Intense laser Pulse with thi foils
The discovery that ultra-intense laser pulses (I > 10{sup 18} W/cm{sup 2}) can produce short pulse, high energy proton beams has renewed interest in the fundamental mechanisms that govern particle acceleration from laser-solid interactions. Experiments have shown that protons present as hydrocarbon contaminants on laser targets can be accelerated up to energies > 50 MeV. Different theoretical models that explain the observed results have been proposed. One model describes a front-surface acceleration mechanism based on the ponderomotive potential of the laser pulse. At high intensities (I > 10{sup 18} W/cm{sup 2}), the quiver energy of an electron oscillating in the electric field of the laser pulse exceeds the electron rest mass, requiring the consideration of relativistic effects. The relativistically correct ponderomotive potential is given by U{sub p} = ([1 + I{lambda}{sup 2}/1.3 x 10{sup 18}]{sup 1/2} - 1) m{sub o}c{sup 2}, where I{lambda}{sup 2} is the irradiance in W{micro}m{sup 2}/cm{sup 2} and m{sub o}c{sup 2} is the electron rest mass.At laser irradiance of I{lambda}{sup 2} {approx} 10{sup 20} W{micro}m{sup 2}/cm{sup 2}, the ponderomotive potential can be of order several MeV. A few recent experiments--discussed in Chapter 3 of this thesis--consider this ponderomotive potential sufficiently strong to accelerate protons from the …
Date:
March 12, 2004
Creator:
Allen, M
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Direct Experimental Evidence of Back-Surface Acceleration from Laser-Irradiated Foils
Au foils were irradiated with a 100-TW, 100-fs laser at intensities greater than 10{sup 20} W/cm{sup 2} producing proton beams with a total yield of {approx} 10{sup 11} and maximum proton energy of > 9 MeV. Removing contamination from the back surface of Au foils with an Ar-ion sputter gun reduced the total yield of accelerated protons to less than 1% of the yield observed without removing contamination. Removing contamination the front surface (laser-interaction side) of the target had no observable effect on the proton beam. We present a one-dimensional particle-in-cell simulation that models the experiment. Both experimental and simulation results are consistent with the back-surface acceleration mechanism described in the text.
Date:
March 29, 2004
Creator:
Allen, Matthew; Patel, Pravesh K.; Mackinnon, Andrew; Price, Dwight; Wilks, Scott & Morse, Edward
Object Type:
Article
System:
The UNT Digital Library
Complex Flows by Nanohydrodynamics
The study of complex flows by particle simulations is speeded up over molecular dynamics (MD) by more than two orders of magnitude by employing a stochastic collision dynamics method (DSMC) extended to high density (CBA). As a consequence, a picture generated on a single processor shows the typical features of the Rayleigh-Taylor instability and is in quantitative agreement with the experimentally found long time behavior.
Date:
March 1, 2004
Creator:
Alley, E; Covello, P & Alder, B
Object Type:
Article
System:
The UNT Digital Library
Black Members of the United States Congress: 1870-2004
Thirty-nine black Members serve in the 107th Congress, all in the House of Representatives. In 210 years of congressional history, there have been 107 black Members of Congress: 103 elected to the House and four to the Senate. This report includes alphabetical listing of black members, selected biographical information, and committee assignments during their tenure in office.
Date:
March 4, 2004
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Women in the United States Congress: 1917-2004
This report identifies the names, committee assignments, dates of service, and (for Representatives) districts of the 219 women Members of Congress.
Date:
March 17, 2004
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Southwest Retort, Volume 56, Number 7, March 2004
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
March 2004
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Design and Status of the Visa II Experiment.
VISA II is the follow-up project to the successful Visible to Infrared SASE Amplifier (VISA) experiment at the Accelerator Test Facility (ATF) in Brookhaven National Lab (BNL). This paper will report the motivation for and status of the two main experiments associated with the VISA II program. One goal of VISA II is to perform an experimental study of the physics of a chirped beam SASE FEL at the upgraded facilities of the ATF. This requires a linearization of the transport line to preserve energy chirping of the electron beam at injection. The other planned project is a strong bunch compression experiment, where the electron bunch is compressed in the chicane, and the dispersive beamline transport, allowing studies of deep saturation.
Date:
March 24, 2004
Creator:
Andonian, G.
Object Type:
Article
System:
The UNT Digital Library