34 Matching Results

Search Results

An electron front end for the Fermilab multi-species 8 GeV SCRF linac

Description: Fermilab is considering a 8 GeV superconducting linac whose primary mission is to serve as an intense H{sup -} injector for the main injector. This accelerator is also planned to be used for accelerating various other species (e.g. electrons, protons and muons). In the present paper we investigate the possibility of such a linac to accelerate high-brightness electron beam up to {approx} 7 GeV. We propose a design for the electron front end based on a photoinjector and consider the electron beam dynamics along the linac. Start-to-end simulations of the full accelerator for electrons are presented. Finally the potential applications of such an electron beam are outlined.
Date: July 8, 2004
Creator: Piot, Philippe R.-G. & Foster, G W
Partner: UNT Libraries Government Documents Department

Characterization of Defense Waste Processing Facility (DWPF) Glass and Deposit Samples from Melter No.2

Description: The Defense Waste Processing Facility (DWPF) Engineering requested characterization of three glass samples that were taken from Melter number 2 after the waste loading had been increased, e.g. after the new quasicrystalline liquidus model had been implemented and after DWPF switched from processing with Frit 200 to Frit 320. These samples were taken after DWPF observed very rapid buildup of deposits in the upper pour spout bore and on the pour spout insert while processing the high waste loading (approximate 38 wt percent feedstock). Rapid deposition in these locations had not occurred prior to this and, in turn, stopped after waste loading decreased. These samples were evaluated at SRTC using various analytical techniques for potential impacts on pouring problems recently experienced by the DWPF.
Date: July 8, 2004
Creator: Jantzen, Carol M.; Cozzi, A. D. & Bibler, N. E.
Partner: UNT Libraries Government Documents Department

Modeling Treated LAW Feed Evaporation

Description: This task examines the potential of the treated waste feed blends to form sodium-aluminum silicate precipitates when evaporated using the zeolite database. To investigate the behavior of the blended pretreated waste feed, an OLI Environmental Simulation Package Software (OLI ESP) model of the treated low activity waste (LAW) evaporator was built. A range of waste feed compositions representative of Envelope A, B, and C were then fed into the OLI model to predict various physical and chemical properties of the evaporator concentrates. Additional runs with treated LAW evaporator were performed to compare chemical and physical property model predictions and experimental results for small-scale radioactive tests of the treated feed evaporation process.
Date: July 8, 2004
Creator: DANIEL, WE
Partner: UNT Libraries Government Documents Department

Dissolution of Simulated and Radioactive Savannah River Site High-Level Waste Sludges with Oxalic Acid & Citric Acid Solutions

Description: This report presents findings from tests investigating the dissolution of simulated and radioactive Savannah River Site sludges with 4 per cent oxalic acid and mixtures of oxalic and citric acid previously recommended by a Russian team from the Khlopin Radium Institute and the Mining and Chemical Combine (MCC). Testing also included characterization of the simulated and radioactive waste sludges. Testing results showed the following: Dissolution of simulated HM and PUREX sludges with oxalic and citric acid mixtures at SRTC confirmed general trends reported previously by Russian testing. Unlike the previous Russian testing six sequential contacts of a mixture of oxalic acid citric acids at a 2:1 ratio (v/w) of acid to sludge did not produce complete dissolution of simulated HM and PUREX sludges. We observed that increased sludge dissolution occurred at a higher acid to sludge ratio, 50:1 (v/w), compared to the recommended ratio of 2:1 (v/w). We observed much lower dissolution of aluminum in a simulated HM sludge by sodium hydroxide leaching. We attribute the low aluminum dissolution in caustic to the high fraction of boehmite present in the simulated sludge. Dissolution of HLW sludges with 4 per cent oxalic acid and oxalic/citric acid followed general trends observed with simulated sludges. The limited testing suggests that a mixture of oxalic and citric acids is more efficient for dissolving HM and PUREX sludges and provides a more homogeneous dissolution of HM sludge than oxalic acid alone. Dissolution of HLW sludges in oxalic and oxalic/citric acid mixtures produced residual sludge solids that measured at higher neutron poison to equivalent 235U weight ratios than that in the untreated sludge solids. This finding suggests that residual solids do not present an increased nuclear criticality safety risk. Generally the neutron poison to equivalent 235U weight ratios of the acid solutions containing dissolved sludge components ...
Date: July 8, 2004
Creator: STALLINGS, MARY
Partner: UNT Libraries Government Documents Department

High quality electron beams from a plasma channel guided laser wakefield accelerator

Description: Laser driven accelerators, in which particles are accelerated by the electric field of a plasma wave driven by an intense laser, have demonstrated accelerating electric fields of hundreds of GV/m. These fields are thousands of times those achievable in conventional radiofrequency (RF) accelerators, spurring interest in laser accelerators as compact next generation sources of energetic electrons and radiation. To date however, acceleration distances have been severely limited by lack of a controllable method for extending the propagation distance of the focused laser pulse. The ensuing short acceleration distance results in low energy beams with 100% electron energy spread, limiting applications. Here we demonstrate that a relativistically intense laser can be guided by a preformed plasma density channel and that the longer propagation distance can result in electron beams of percent energy spread with low emittance and increased energy, containing >10{sup 9} electrons above 80 MeV. The preformed plasma channel technique forms the basis of a new class of accelerators, combining beam quality comparable to RF accelerators with the high gradients of laser accelerators to produce compact tunable high brightness electron and radiation sources.
Date: July 8, 2004
Creator: Geddes, C.G.R.; Toth, Cs.; van Tilborg, J.; Esarey, E.; Schroeder, C.B.; Bruhwiler, D. et al.
Partner: UNT Libraries Government Documents Department

Reductive immobilization of U(VI) in Fe(III) oxide-reducing subsurface sediments: Analysis of coupled microbial-geochemical processes in experimental reactive transport systems

Description: Although the fundamental microbiological and geochemical processes underlying the potential use of dissimilatory metal-reducing bacteria (DMRB) to create subsurface redox barriers for immobilization of uranium and other redox-sensitive metal/radionuclide contaminants are well-understood (Lovley et al., 1991; Gorby and Lovley, 1992; Lovley and Phillips, 1992; Lovley, 1995; Fredrickson et al., 2000; Wielinga et al., 2000; Wielinga et al., 2001), several fundamental scientific questions need to be addressed in order to understand and predict how such treatment procedures would function under in situ conditions in the subsurface. These questions revolve around the dynamic interactions between hydrologic flux and the coupled microbial-geochemical processes which are likely to occur within a redox barrier treatment zone. A brief summary of such questions includes the following: (1) What are the kinetic limitations to the efficiency of microbial U(VI) scavenging in subsurface sediments? (2) Is U(VI) sorbed to Fe(III) oxide and other solid-phase surfaces subject to enzymatic reduction? If so, what are the relative kinetics of aqueous vs. sorbed U(VI) reduction? (3) What are the relative kinetics of direct, enzymatic U(VI) reduction vs. abiotic reduction of U(VI) by surface-bound biogenic Fe(II)? (4) Can coupled Fe(III) oxide/U(VI) reduction be sustained long-term in subsurface environments? What are the kinetic relationships between Fe(III) oxide reduction, DMRB growth, and U(VI) reduction in advectively open sedimentary systems? The overall objective of our research is to address the questions listed above through laboratory-based batch and reactive transport experiments with natural Fe(III) oxide-bearing subsurface materials and a representative pure culture DMRB. A unique feature of our research is that we are using levels of total uranium (ca. 10{sup -6} to 10{sup -4} mol per dm{sup 3} bulk volume) and aqueous/solid-phase ratios ({le} ca. 10{sup -3} mol U per kg sediment) which are much closer to those present in contaminated subsurface environments compared to levels ...
Date: July 8, 2004
Creator: Roden, Eric E. & Barnett, Mark O.
Partner: UNT Libraries Government Documents Department

2-D Imaging of Electron Temperature in Tokamak Plasmas

Description: By taking advantage of recent developments in millimeter wave imaging technology, an Electron Cyclotron Emission Imaging (ECEI) instrument, capable of simultaneously measuring 128 channels of localized electron temperature over a 2-D map in the poloidal plane, has been developed for the TEXTOR tokamak. Data from the new instrument, detailing the MHD activity associated with a sawtooth crash, is presented.
Date: July 8, 2004
Creator: Munsat, T.; Mazzucato, E.; Park, H.; Domier, C. W.; Johnson, M.; Luhmann, N. C., Jr. et al.
Partner: UNT Libraries Government Documents Department

Empirical analysis of the spot market implications ofprice-elastic demand

Description: Regardless of the form of restructuring, deregulated electricity industries share one common feature: the absence of any significant, rapid demand-side response to the wholesale (or, spotmarket) price. For a variety of reasons, electricity industries continue to charge most consumers an average cost based on regulated retail tariff from the era of vertical integration, even as the retailers themselves are forced to purchase electricity at volatile wholesale prices set in open markets. This results in considerable price risk for retailers, who are sometimes forbidden by regulators from signing hedging contracts. More importantly, because end-users do not perceive real-time (or even hourly or daily) fluctuations in the wholesale price of electricity, they have no incentive to adjust their consumption in response to price signals. Consequently, demand for electricity is highly inelastic, and electricity generation resources can be stretched to the point where system stability is threatened. This, then, facilitates many other problems associated with electricity markets, such as market power and price volatility. Indeed, economic theory suggests that even modestly price-responsive demand can remove the stress on generation resources and decrease spot prices. To test this theory, we use actual generator bid data from the New York control area to construct supply stacks, and intersect them with demand curves of various slopes to approximate different levels of demand elasticity. We then estimate the potential impact of real-time pricing on the equilibrium spot price and quantity. These results indicate the immediate benefits that could be derived from a more price-elastic demand. Such analysis can provide policymakers with a measure of how effective price-elastic demand can potentially reduce prices and maintain consumption within the capability of generation resources.
Date: July 8, 2004
Creator: Siddiqui, Afzal S.; Bartholomew, Emily S. & Marnay, Chris
Partner: UNT Libraries Government Documents Department

Physics Results from the National Spherical Torus Experiment

Description: The National Spherical Torus Experiment (NSTX) produces plasmas with aspect ratio A {triple_bond} R/a = 0.85m/0.68m {approx} 1.25, at plasma currents up to 1.5 MA with vacuum toroidal magnetic field up to 0.6 T on axis. The plasmas are heated by up to 6 MW of High-Harmonic Fast Waves (HHFW) at a frequency 30 MHz and by 7 MW of deuterium Neutral Beam Injection (NBI) at an energy up to 100 keV. Since January 2004, NSTX has been operating, routinely at toroidal fields up to 0.45 T, with a new central conductor bundle in the toroidal field coil.
Date: July 8, 2004
Creator: Team, M.G. Bell for the NSTX Research
Partner: UNT Libraries Government Documents Department

[News Clip: Lay]

Description: Video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date: July 8, 2004
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Partner: UNT Libraries Special Collections

Human Capital: Key Practices to Increasing Federal Telework

Description: Testimony issued by the Government Accountability Office with an abstract that begins "Telework has received significant attention in Congress and the executive branch and is an increasingly popular flexibility among federal employees. In July 2003 GAO reported on the use of telework in the federal government (GAO-03-679). Not only is telework an important flexibility from the perspective of employees, it has also become a critical management tool for coping with potential disruptions in the workplace, including terrorism. This statement highlights key practices GAO research identified as important to implementing successful telework initiatives. The statement then discusses efforts to coordinate and promote telework, and concludes with a review of OPM's May 2004 telework report."
Date: July 8, 2004
Creator: United States. Government Accountability Office.
Partner: UNT Libraries Government Documents Department

Financial Accounting Standards: Accounting for Stock Options and Other Share-Based Payments

Description: Testimony issued by the Government Accountability Office with an abstract that begins "GAO discussed its perspective on the process for establishing accounting standards for private-sector entities and then, more specifically, the current proposals for accounting for stock options. We recognize that accounting for stock options is a complex and controversial issue on which reasonable people can and do disagree. As a result, in light of the Financial Accounting Standards Board's (FASB) current proposed standard for accounting for stock options and other share-based compensation, there has been a renewed interest for the Congress to possibly legislate accounting rules for stock options. FASB is a non-governmental organization empowered to establish financial accounting and reporting standards for private-sector entities. Although this function legally resides with the Securities and Exchange Commission (SEC) for public companies as part of its mandate to administer and enforce the provisions of the federal securities laws, the SEC has traditionally relied on FASB since 1973 to fulfill this function. The U.S. capital markets depend on a system of continuously improving financial information about the underlying economic activities of companies. This information is fostered and framed by independently established financial accounting and reporting standards, collectively referred to as generally accepted accounting principles (GAAP)."
Date: July 8, 2004
Creator: United States. Government Accountability Office.
Partner: UNT Libraries Government Documents Department

Americans with Disabilities Act (ADA) Requirements Concerning the Provision of Interpreters by Hospitals and Doctors

Description: This report briefly discusses the Americans with Disabilities Act (ADA), which prohibits discrimination against individuals with disabilities by places of public accommodation. This report specifically discusses a common question of whether or not the ADA requires medical doctors and hospitals to provide an interpreter when they have a patient with a hearing disability.
Date: July 8, 2004
Creator: Jones, Nancy Lee
Partner: UNT Libraries Government Documents Department

United Nations: Observations on the Oil for Food Program and Areas for Further Investigation

Description: Testimony issued by the Government Accountability Office with an abstract that begins "The Oil for Food program was established by the United Nations and Iraq in 1996 to address concerns about the humanitarian situation after international sanctions were imposed in 1990. The program allowed the Iraqi government to use the proceeds of its oil sales to pay for food, medicine, and infrastructure maintenance. The program appears to have helped the Iraqi people. From 1996 through 2001, the average daily food intake increased from 1,300 to 2,300 calories. From 1997-2002, Iraq sold more than $67 billion of oil through the program and issued $38 billion in letters of credit to purchase commodities. GAO (1) reports on our estimates of the illegal revenue acquired by the former Iraqi regime in violation of U.N. sanctions and provides some observations on the administration of the program and (2) suggests areas for additional analysis and summarizes the status of several ongoing investigations."
Date: July 8, 2004
Creator: United States. Government Accountability Office.
Partner: UNT Libraries Government Documents Department

Department of Homeland Security: Financial Management Challenges

Description: Testimony issued by the Government Accountability Office with an abstract that begins "The Homeland Security Act of 2002 brought together 22 agencies to create a new cabinet-level department focusing on reducing U.S. vulnerability to terrorist attacks, and minimizing damages and assisting in recovery from attacks that do occur. GAO has previously reported on the Department of Homeland Security's (DHS) financial management challenges and key elements necessary for reform. DHS continues to be faced with significant financial management challenges, including addressing existing internal control weaknesses and integrating redundant inherited financial management systems. Additionally, DHS is the largest entity in the federal government that is not subject to the Chief Financial Officers (CFO) Act of 1990 or the Federal Financial Management Improvement Act (FFMIA) of 1996. In light of these conditions, Congress asked GAO to testify on the financial management challenges facing DHS."
Date: July 8, 2004
Creator: United States. Government Accountability Office.
Partner: UNT Libraries Government Documents Department

Defense Trade: Issues Concerning the Use of Offsets in International Defense Sales

Description: Testimony issued by the Government Accountability Office with an abstract that begins "Views on defense offsets range from beliefs that they are both positive and an unavoidable part of doing business overseas to beliefs that they negatively affect the U.S. industrial base. Defense offsets are often viewed as the key to foreign sales and thus increased business on the prime contractor level. They can also result in reduced unit costs to the U.S. military because of the increased size of production runs. However, the use of a foreign supplier by a U.S. prime contractor as a result of an offset may lead to decreased business opportunities for U.S. suppliers. Additionally, U.S. prime contractors may develop long-term relationships with foreign suppliers, which may lead to the transfer of capability from the U.S. defense industrial base. As a result of congressional concerns about emerging trends in defense offsets, GAO conducted a number of reviews and issued multiple reports. Because of GAO's work in this area, Congress asked us to provide our observations on offset issues. Specifically, GAO is providing observations on (1) what constitutes offsets and how they are used in defense trade, (2) how that use has changed over time, and (3) the quality and extent of information concerning offsets that is currently available."
Date: July 8, 2004
Creator: United States. Government Accountability Office.
Partner: UNT Libraries Government Documents Department

Department of Defense: Financial and Business Management Transformation Hindered by Long-standing Problems

Description: Testimony issued by the Government Accountability Office with an abstract that begins "GAO has previously reported on the Department of Defense's (DOD) financial management and business related problems and key elements necessary for successful reform. Although the underlying conditions remain fundamentally unchanged, DOD continues to be confronted with pervasive problems related to its systems, processes (including internal controls), and people (human capital). These problems impede DOD's ability to operate its numerous business operations in an efficient and effective manner. Congress asked GAO to provide its views on (1) the impact that long-standing financial management and related business process weaknesses continue to have on DOD, (2) the underlying causes of DOD business transformation challenges, and (3) DOD's business transformation efforts. In addition, GAO reiterates the key elements to successful reform: (1) an integrated business management transformation strategy, (2) sustained leadership and resource control, (3) clear lines of responsibility and accountability, (4) results-oriented performance measures, (5) appropriate incentives and consequences, (6) an enterprise architecture to guide reform efforts, and (7) effective monitoring and oversight."
Date: July 8, 2004
Creator: United States. Government Accountability Office.
Partner: UNT Libraries Government Documents Department

Fiscal Year 2003 U.S. Government Financial Statements: Sustained Improvement in Federal Financial Management Is Crucial to Addressing Our Nation's Future Fiscal Challenges

Description: Testimony issued by the Government Accountability Office with an abstract that begins "GAO is required to annually audit the consolidated financial statements of the U.S. government. Proper accounting and reporting practices are essential in the public sector. The U.S. government is the largest, most diverse, most complex, and arguably the most important entity on earth today. Its services--homeland security, national defense, Social Security, mail delivery, and food inspection, to name a few--directly affect the well-being of almost every American. But sound decisions on the future direction of vital federal government programs and policies are made more difficult without timely, accurate, and useful financial and performance information. Until the problems discussed in GAO's audit report on the U.S. government's consolidated financial statements are adequately addressed, they will continue to (1) hamper the federal government's ability to accurately report a significant portion of its assets, liabilities, and costs; (2) affect the federal government's ability to accurately measure the full cost as well as the financial and nonfinancial performance of certain programs while effectively managing related operations; and (3) significantly impair the federal government's ability to adequately safeguard certain significant assets and properly record various transactions."
Date: July 8, 2004
Creator: United States. Government Accountability Office.
Partner: UNT Libraries Government Documents Department

PLASTIC DEFORMATION AND FRACTURE OF STEELS UNDER DYNAMIC BIAXIAL LOADING

Description: Dynamic equi-biaxial bulging of thin AerMet 100 alloy plates was studied. The plates were deformed using a gas-gun driven flyer plate test set-up at impact velocities between 1.0 and 2.0 km/sec. The results indicate that in addition to biaxial stretching (and thinning) of the plate, internal cavitation (spallation fracture) results from the complex wave interactions within the plate. No outward evidence of damage was observed at the lower velocities, in the range of 1.0-1.2 km/sec. Fine scale cracking of the plates was observed at impact velocity above approximately 1.4 km/sec. Complete specimen fracture, in the form of multiple petals and pie-shaped fragments, was observed at impact velocity above 1.6 km/sec. Hydrodynamic computer code simulations were performed, prior to and in conjunction with the experiments, to aid in experiment design and interpretation of the experimental data.
Date: July 8, 2004
Creator: Syn, C; Moreno, J; Goto, D M; Belak, J & Grady, D
Partner: UNT Libraries Government Documents Department

SEISMIC DATA FOR NUCLEAR EXPLOSION MONITORING IN THE ARABIAN PENINSULA

Description: We report results from the third and final year of our project (ROA0101-35) to collect seismic event and waveform data recorded in and around the Arabian Peninsula. This effort involves several elements. We are working with King Abdulaziz City for Science and Technology to collect data from the Saudi National Seismic Network, that consists of 38 digital three-component stations (27 broadband and 11 short-period). We have an ongoing collaboration with the Kuwait Institute for Scientific Research, which runs the eight station Kuwait National Seismic Network. We installed two temporary broadband stations in the United Arab Emirates (funded by NNSA NA-24 Office of Non-Proliferation & International Security). In this paper we present a summary of data collected under these efforts including integration of the raw data into LLNL's Seismic Research Database and preliminary analysis of souce parameters and earth structure.
Date: July 8, 2004
Creator: Rodgers, A & Al-Amri, A
Partner: UNT Libraries Government Documents Department