A 3.3 MJ, Rb + 1 driver design based on an integrated systems analysis (open access)

A 3.3 MJ, Rb + 1 driver design based on an integrated systems analysis

A computer model for systems analysis of heavy ion drivers has been developed and used to evaluate driver designs for inertial fusion energy (IFE). The present work examines a driver for a close-coupled target design that requires less total beam energy but also smaller beam spots sizes than previous target designs. Design parameters and a cost estimate for a 160 beam, 3.3 MJ driver using rubidium ions (A = 85) are reported, and the sensitivity of the results to variations in selected design parameters is given.
Date: March 7, 2000
Creator: Meier, W. R.; Barnard, J. J. & Bangerter, R. O.
Object Type: Article
System: The UNT Digital Library

COPA Commission

The COPA Commission, a congressionally appointed panel, was mandated by the Child Online Protection Act, which was approved by Congress in October 1998. The primary purpose of the Commission is to "identify technological or other methods that will help reduce access by minors to material that is harmful to minors on the Internet."
Date: March 7, 2000
Creator: COPA Commission
Object Type: Website
System: The UNT Digital Library
Dedicated OO expertise applied to Run II software projects (open access)

Dedicated OO expertise applied to Run II software projects

The change in software language and methodology by CDF and D0 to object-oriented from procedural Fortran is significant. Both experiments requested dedicated expertise that could be applied to software design, coding, advice and review. The Fermilab Run II offline computing outside review panel agreed strongly with the request and recommended that the Fermilab Computing Division hire dedicated OO expertise for the CDF/D0/Computing Division joint project effort. This was done and the two experts have been an invaluable addition to the CDF and D0 upgrade software projects and to the Computing Division in general. These experts have encouraged common approaches and increased the overall quality of the upgrade software. Advice on OO techniques and specific advice on C++ coding has been used. Recently a set of software reviews has been accomplished. This has been a very successful instance of a targeted application of computing expertise, and constitutes a very interesting study of how to move toward modern computing methodologies in HEP.
Date: March 7, 2000
Creator: Amidei, D.
Object Type: Article
System: The UNT Digital Library
Experimental study of sin 2 {beta} and sin 2 {alpha} (open access)

Experimental study of sin 2 {beta} and sin 2 {alpha}

Detailed measurements of CP violation in B meson decay are on the horizon. Here the author reviews the status of current measurements of sin 2{beta} made at LEP and CDF. These yield an average of sin 2{beta} = 0.82 {+-} 0.39, giving 97% confidence that {beta} is greater than 0, evidence that CP violation occurs in B decay. He reviews predictions for the precision one can expect on sin 2{beta} and sin 2{alpha} in the next few years.
Date: March 7, 2000
Creator: Truschuk, W.
Object Type: Article
System: The UNT Digital Library
Financial Management: Differences in Army and Air Force Disbursing and Accounting Records (open access)

Financial Management: Differences in Army and Air Force Disbursing and Accounting Records

A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on differences in the Army's and Air Force's disbursing and accounting records, focusing on: (1) if, and to what extent, contract payment transactions recorded in the Army and the Air Force official accounting records differed from mechanization of contract administration services (MOCAS) disbursing system records; (2) the types of differences between the disbursing and accounting systems and, to the extent possible, the causes for the differences; and (3) the potential effect any identified deficiencies may have on the Department of Defense's (DOD) planned contract payment system improvements."
Date: March 7, 2000
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
Food Stamp Program: Better Use of Electronic Data Could Result in Disqualifying More Recipients Who Traffic Benefits (open access)

Food Stamp Program: Better Use of Electronic Data Could Result in Disqualifying More Recipients Who Traffic Benefits

A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the efforts of states and the Food and Nutrition Service (FNS) to reduce Food Stamp trafficking, focusing on the: (1) extent to which the states with statewide electronic benefit transfer (EBT) systems are identifying and disqualifying recipients who engage in trafficking; and (2) actions FNS has taken to encourage the states to identify and disqualify recipients engaged in trafficking."
Date: March 7, 2000
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
Hadron Collider Detectors (open access)

Hadron Collider Detectors

Experiments are being prepared at the Fermilab Tevatron and the CERN Large Hadron Collider that promise to deliver extraordinary insights into the nature of spontaneous symmetry breaking, and the role of supersymmetry in the universe. This article reviews the goals, challenges, and designs of these experiments. The first hadron collider, the ISR at CERN, has to overcome two initial obstacles. The first was low luminosity, which steadily improved over time. The second was the broad angular spread of interesting events. In this regard Maurice Jacob noted (1): The answer is ... sophisticated detectors covering at least the whole central region (45{degree} {le} {theta} {le} 135{degree}) and full azimuth. This statement, while obvious today, reflects the major revelation of the ISR period that hadrons have partonic substructure. The result was an unexpectedly strong hadronic yield at large transverse momentum (p{sub T}). Partly because of this, the ISR missed the discovery of the J/{psi} and later missed the {Upsilon}. The ISR era was therefore somewhat less auspicious than it might have been. It did however make important contributions in areas such as jet production and charm excitation and it paved the way for the SPS collider, also at CERN.
Date: March 7, 2000
Creator: Incandela, J.R.
Object Type: Article
System: The UNT Digital Library
High Energy Gamma Rays from p+X, X=Cu, Ag, Au at 34 MeV (open access)

High Energy Gamma Rays from p+X, X=Cu, Ag, Au at 34 MeV

In this paper we present results from the measurement of the gamma ray yield in the reaction of 34-MeV protons on Cu, Ag and Au. The protons were produced by the University of Washington superconducting linac. The gamma rays were measured using a large NaI and two large BaF{sub 2} detectors. Angular distributions were obtained for each of the three targets. Data for the Cu and Ag target were taken at six lab angles between 35 and 135 degrees, while data were taken at eight lab angles between 35 and 135 degrees for the Au target. The data were compared to several models. These included Hauser-Feshbach and direct-semidirect (DSD) calculations. We also compared the measurements to proton-nucleus bremsstrahlung calculations. The bremsstrahlung calculations greatly underpredicted the cross section and produced an angular distribution which was too flat. The Hauser-Feshbach calculations reproduced the yield of the softer portion of the spectrum reasonably well for all three targets. The DSD calculations reproduced the yield and angular distributions quite well for energies above about 20 MeV. However, the yields were underpredicted in the 15-18 MeV region, which suggests that multistep mechanisms may be needed for this target.
Date: March 7, 2000
Creator: Luke, S. J.; Dietrich, F. S.; Chadwick, M. B.; Gossett, C. A.; Kaplan, M. S.; McLain, B. T. et al.
Object Type: Article
System: The UNT Digital Library
Inertial fusion technology spin-offs-history provides a glimpse of the future (open access)

Inertial fusion technology spin-offs-history provides a glimpse of the future

The development and demonstration of inertial fusion is incredibly challenging because it requires simultaneously controlling and precisely measuring parameters at extreme values in energy, space, and time. The challenges range from building megajoule (10{sup 6} J) drivers that perform with percent-level precision to fabricating targets with submicron specifications to measuring target performance at micron scale (10{sup -6} m) with picosecond (10{sup -12} s) time resolution. Over the past 30 years in attempting to meet this challenge, the inertial fusion community around the world has invented new technologies in lasers, particle beams, pulse power drivers, diagnostics, target fabrication, and other areas. These technologies have found applications in diverse fields of industry and science. Moreover, simply assembling the teams with the background, experience, and personal drive to meet the challenging requirements of inertial fusion has led to spin-offs in unexpected directions, for example, in laser isotope separation, extreme ultraviolet (EUV) lithography for microelectronics, compact and inexpensive radars, advanced laser materials processing, and medical technology. It is noteworthy that more than 40 R&D 100 awards, the ''Oscars of applied research'' have been received by members of the inertial fusion community over this period. Not surprisingly, the inertial fusion community has created many new …
Date: March 7, 2000
Creator: Powell, H
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Military Personnel: Systematic Analyses Needed to Monitor Retention in Key Careers and Occupations (open access)

Military Personnel: Systematic Analyses Needed to Monitor Retention in Key Careers and Occupations

A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on recent trends in retention rates among officers and enlisted personnel in the four armed services, focusing on: (1) how much information the Department of Defense (DOD) has on retention trends across the services; and (2) analyzing changes in retention rates in the aggregate and by career stage and occupation from 1988 through 1998."
Date: March 7, 2000
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
Nondestructive evaluation and assay for the plutonium ceramification test facility (open access)

Nondestructive evaluation and assay for the plutonium ceramification test facility

Lawrence Livermore National Laboratory (LLNL) has conducted design and testing activities of the Nondestructive Assay/Evaluation (NDA/NDE) system that will be installed to support the Plutonium Ceramification Test Facility (PuCTF). PuCTF immobilizes plutonium using the ceramic can-in-canister technology. The overall function of the NDA/NDE System is to ensure that sintered pucks contain the appropriate materials for ceramification process control, special nuclear materials (SNM) accountability, and repository acceptance. The system accepts sample pucks from the ceramification system, performs measurements, and determines if the product pucks are acceptable. This report details the conceptual system that is being developed.
Date: March 7, 2000
Creator: Mitchell, M.; Pugh, D. & Wang, T. F.
Object Type: Article
System: The UNT Digital Library
Phase I chemical speciation modeling of stream mixing in the LAW/HLW Envelope A Treatment (open access)

Phase I chemical speciation modeling of stream mixing in the LAW/HLW Envelope A Treatment

The intent of this work was to provide a first approximation of the effect of stream mixing and waste stream composition on precipitation.
Date: March 7, 2000
Creator: Kaplan, D.I.
Object Type: Report
System: The UNT Digital Library
Plutonium Disposition by Immobilization (open access)

Plutonium Disposition by Immobilization

The ultimate goal of the Department of Energy (DOE) Immobilization Project is to develop, construct, and operate facilities that will immobilize between 17 to 50 tonnes (MT) of U.S. surplus weapons-usable plutonium materials in waste forms that meet the ''spent fuel'' standard and are acceptable for disposal in a geologic repository. Using the ceramic can-in-canister technology selected for immobilization, surplus plutonium materials will be chemically combined into ceramic forms which will be encapsulated within large canisters of high level waste (HLW) glass. Deployment of the immobilization capability should occur by 2008 and be completed within 10 years. In support of this goal, the DOE Office of Fissile Materials Disposition (MD) is conducting development and testing (D&T) activities at four DOE laboratories under the technical leadership of Lawrence Livermore National Laboratory (LLNL). The Savannah River Site has been selected as the site for the planned Plutonium Immobilization Plant (PIP). The D&T effort, now in its third year, will establish the technical bases for the design, construction, and operation of the U. S. capability to immobilize surplus plutonium in a suitable and cost-effective manner. Based on the D&T effort and on the development of a conceptual design of the PIP, automation is …
Date: March 7, 2000
Creator: Gould, T.; DiSabatino, A. & Mitchell, M.
Object Type: Article
System: The UNT Digital Library
RFI/RI work plan for the Road A Chemical Basin 904-111G (open access)

RFI/RI work plan for the Road A Chemical Basin 904-111G

This Resource Conservation and Recovery Act (RCRA) Facility Investigation (RFI)/Remedial Investigation (RI) Work Plan has been prepared for the Road A Chemical Basin Operable Unit (RdACB OU) (904-111G). This unit is subject to the requirements of both RCRA and the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). This Work Plan presents the initial evaluation of existing unit data, applicable background data, the regulatory framework for the unit investigation, and the evaluations and decisions made during the determination of the scope and objectives of the planned Remedial Investigation/Feasibility Study (RI/FS) activities.
Date: March 7, 2000
Creator: Kmetz, T. F.; Vanpelt, R. & McAdams, T.
Object Type: Report
System: The UNT Digital Library
Subsurface Transport Over Reactive Multiphases (STORM): A General, Coupled, Nonisothermal Multiphase Flow, Reactive Transport, and Porous Medium Alteration Simulator, Version 2, User's Guide (open access)

Subsurface Transport Over Reactive Multiphases (STORM): A General, Coupled, Nonisothermal Multiphase Flow, Reactive Transport, and Porous Medium Alteration Simulator, Version 2, User's Guide

N/A
Date: March 7, 2000
Creator: Bacon, Diana H.; White, Mark D. & McGrail, B. Peter
Object Type: Report
System: The UNT Digital Library
Subsurface Transport Over Reactive Multiphases (STORM): A general, coupled, nonisothermal multiphase flow, reactive transport, and porous medium alteration simulator, Version 2 user's guide (open access)

Subsurface Transport Over Reactive Multiphases (STORM): A general, coupled, nonisothermal multiphase flow, reactive transport, and porous medium alteration simulator, Version 2 user's guide

The Hanford Site, in southeastern Washington State, has been used extensively to produce nuclear materials for the US strategic defense arsenal by the Department of Energy (DOE) and its predecessors, the US Atomic Energy Commission and the US Energy Research and Development Administration. A large inventory of radioactive and mixed waste has accumulated in 177 buried single- and double shell tanks. Liquid waste recovered from the tanks will be pretreated to separate the low-activity fraction from the high-level and transuranic wastes. Vitrification is the leading option for immobilization of these wastes, expected to produce approximately 550,000 metric tons of Low Activity Waste (LAW) glass. This total tonnage, based on nominal Na{sub 2}O oxide loading of 20% by weight, is destined for disposal in a near-surface facility. Before disposal of the immobilized waste can proceed, the DOE must approve a performance assessment, a document that described the impacts, if any, of the disposal facility on public health and environmental resources. Studies have shown that release rates of radionuclides from the glass waste form by reaction with water determine the impacts of the disposal action more than any other independent parameter. This report describes the latest accomplishments in the development of a …
Date: March 7, 2000
Creator: Bacon, D. H.; White, M. D. & McGrail, B. P.
Object Type: Report
System: The UNT Digital Library
Two target height effects on interferometric synthetic aperture radar coherence (open access)

Two target height effects on interferometric synthetic aperture radar coherence

Useful products generated from interferometric synthetic aperture radar (IFSAR) complex data include height measurement, coherent change detection, and classification. The IFSAR coherence is a spatial measure of complex correlation between two collects, a product of IFSAR signal processing. A tacit assumption in such IFSAR signal processing is that one height target exists in each range-Doppler cell. This paper presents simulations of IFSAR coherence if two targets with different heights exist in a given range-Doppler cell, a condition in IFSAR collections produced by layover. It also includes airborne IFSAR data confirming the simulation results. The paper concludes by exploring the implications of the results on IFSAR classification and height measurements.
Date: March 7, 2000
Creator: Yocky, David A. & Jakowatz Jr.,CHARLES V.
Object Type: Article
System: The UNT Digital Library
World Trade Organization: Progress in Agricultural Trade Negotiations May Be Slow (open access)

World Trade Organization: Progress in Agricultural Trade Negotiations May Be Slow

Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed the negotiations on agricultural trade being conducted by the World Trade Organization (WTO), focusing on: (1) U.S. and other countries' objectives in the agricultural trade negotiations; (2) progress achieved during the 1999 WTO Seattle ministerial conference; and (3) prospects for future negotiations."
Date: March 7, 2000
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Activation of the Mercury Laser: A Diode-Pumped Solid-State Laser Driver for Inertial Fusion (open access)

Activation of the Mercury Laser: A Diode-Pumped Solid-State Laser Driver for Inertial Fusion

Initial measurements are reported for the Mercury laser system, a scalable driver for rep-rated high energy density physics research. The performance goals include 10% electrical efficiency at 10 Hz and 100 J with a 2-10 ns pulse length. This laser is an angularly multiplexed 4-pass gas-cooled amplifier system based on image relaying to minimize wavefront distortion and optical damage risk at the 10 Hz operating point. The efficiency requirements are fulfilled using diode laser pumping of ytterbium doped strontium fluorapatite crystals.
Date: March 7, 2001
Creator: Bayramian, A. J.; Bibeau, C.; Beach, R. J.; Chanteloup, J. C.; Ebbers, C. A.; Kanz, K. et al.
Object Type: Article
System: The UNT Digital Library
The Budget for Fiscal Year 2000 (open access)

The Budget for Fiscal Year 2000

This report discusses the final budget numbers for FY2000 that put the surplus for FY2000 at $236 billion , receipts at $2,025 billion and outlays at $1,789 billion. They differ very little from the numbers that the Treasury previously released on October 24, 2000.
Date: March 7, 2001
Creator: Winters, Philip D.
Object Type: Report
System: The UNT Digital Library
Direct Carbon Conversion: Application to the Efficient Conversion of Fossil Fuels to Electricity (open access)

Direct Carbon Conversion: Application to the Efficient Conversion of Fossil Fuels to Electricity

We introduce a concept for efficient conversion of fossil fuels to electricity that entails the decomposition of fossil-derived hydrocarbons into carbon and hydrogen, and electrochemical conversion of these fuels in separate fuel cells. Carbon/air fuel cells have the advantages of near zero entropy change and associated heat production (allowing 100% theoretical conversion efficiency). The activities of the C fuel and CO{sub 2} product are invariant, allowing constant EMF and full utilization of fuel in single pass mode of operation. System efficiency estimates were conducted for several routes involving sequential extraction of a hydrocarbon from the fossil resource by (hydro) pyrolysis followed by thermal decomposition. The total energy conversion efficiencies of the processes were estimated to be (1) 80% for direct conversion of petroleum coke; (2) 67% HHV for CH{sub 4}; (3) 72% HHV for heavy oil (modeled using properties of decane); (4) 75.5% HHV (83% LHV) for natural gas conversion with a Rankine bottoming cycle for the H{sub 2} portion; and (5) 69% HHV for conversion of low rank coals and lignite through hydrogenation and pyrolysis of the CH{sub 4} intermediate. The cost of carbon fuel is roughly $7/GJ, based on the cost of the pyrolysis step in the industrial …
Date: March 7, 2001
Creator: Cooper, J. F.; Cherepy, N.; Berry, G.; Pasternak, A.; Surles, T. & Steinberg, M.
Object Type: Article
System: The UNT Digital Library
Divertor Target Heat Load Reduction by Electrical Biasing, and Application to COMPASS-D (open access)

Divertor Target Heat Load Reduction by Electrical Biasing, and Application to COMPASS-D

A toroidally-asymmetric potential structure in the scrape-off layer (SOL) plasma may be formed by toroidally distributed electrical biasing of the divertor target tiles. The resulting ExB convective motions should increase the plasma radial transport in the SOL and thereby reduce the heat load at the divertor [1]. In this paper we develop theoretical modeling and describe the implementation of this concept to the COMPASS-D divertor. We show that strong magnetic shear near the X-point should cause significant squeezing of the convective cells preventing convection from penetrating above the X-point. This should result in reduced heat load at the divertor target without increasing the radial transport in the portion of the SOL in direct contact with the core plasma, potentially avoiding any confinement degradation. implementation of divertor biasing is in hand on COMPASS-D involving insulation of, and modifications to, the present divertor tiles. Calculations based on measured edge parameters suggest that modest currents {approx} 8 A/tile are required, at up to 150V, to drive the convection. A technical test is preceeding full bias experiments.
Date: March 7, 2001
Creator: Fielding, S. J.; Cohen, R. H.; Helander, P. & Ryutov, D. D.
Object Type: Article
System: The UNT Digital Library
Federal Taxes: Information on Payroll Taxes and Earned Income Tax Credit Noncompliance (open access)

Federal Taxes: Information on Payroll Taxes and Earned Income Tax Credit Noncompliance

Testimony issued by the General Accounting Office with an abstract that begins "This testimony discusses (1) how payroll taxes fund Social Security and the Medicare Hospital Insurance (HI) programs and (2) noncompliance associated with the Earned Income Tax Credit (EITC) and efforts to deal with that noncompliance. Payroll taxes fund the Social Security Program and the Medicare HI program. These taxes are paid in equal portions by employees and their employers. Employees and their families become eligible to collect these benefits once workers have been employed for a sufficient period of time. Although Social Security benefits are calculated using a formula that considers lifetime earnings, HI benefits are based on the health of the covered individual and are paid directly to the health care provider. Demographic trends indicate that these programs will impose an increasing burden on the federal budget and the overall economy. Regarding EITC, significant compliance problems can expose the Internal Revenue Service (IRS) to billions of dollars in overpayments. EITC noncompliance is identified as taxpayer errors and intent to defraud. IRS and Congress have taken several steps to reduce noncompliance, including the passage of laws that enabled IRS to disallow EITC claims with invalid social security numbers …
Date: March 7, 2001
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Historical Time Line and Information About the Hanford Site (open access)

Historical Time Line and Information About the Hanford Site

Historical time line of the Hanford Site spanning from 1940 through 1997, including photographs and other information regarding the town sites and living conditions.
Date: March 7, 2001
Creator: Briggs, James D.
Object Type: Report
System: The UNT Digital Library