Search Results

Progress and Critical Issues for IFE Blanket and Chamber Research

Description: Advances in high gain target designs for Inertial Fusion Energy (IFE), and the initiation of construction of large megajoule-class laser facilities in the U.S. (National Ignition Facility) and France (Laser-Megajoule) capable of testing the requirements for inertial fusion ignition and propagating burn, have improved the prospects for IFE. Accordingly, there have recently been modest increases in the US fusion research program related to the feasibility of IFE. These research areas include heavy-ion accelerators, Krypton-Fluoride (KrF) gas lasers, diode-pumped, solid-state (DPSSL) lasers, IFE target designs for higher gains, feasibility of low cost IFE target fabrication and accurate injection, and long-lasting IFE fusion chambers and final optics. Since several studies of conceptual IFE power plant and driver designs were completed in 1992-1996 [1-5], U.S. research in the IFE blanket, chamber, and target technology areas has focused on the critical issues relating to the feasibility of IFE concepts towards the goal of achieving economically-competitive and environmentally-attractive fusion energy. This paper discusses the critical issues in these areas, and the approaches taken to address these issues. The U.S. research in these areas, called IFE Chamber and Target Technologies, is coordinated through the Virtual Laboratory for Technology (VLT) formed by the Department of Energy in December 1998.
Date: June 23, 1999
Creator: Abdou, M.; Kulcinski, G. L.; Latkowski, J. F.; Logan, B. G.; Meier, W. R.; Moir, R. W. et al.
Partner: UNT Libraries Government Documents Department

Surface Characterization of a Paper Web at the Wet End

Description: We present an algorithm for the detection and representation of structures and non-uniformities on the surface of a paper web at the wet end (slurry). This image processing/analysis algorithm is developed as part of a complete on-line web characterization system. Images of the slurry, carried by a fast moving table, are obtained using a stroboscopic light and a CCD camera. The images have very poor contrast and contain noise from a variety of sources. Those sources include the acquisition system itself, the lighting, the vibrations of the moving table being imaged, and the scattering water from the same table's movement. After many steps of enhancement, conventional edge detection methods were still inconclusive and were discarded. The facet model algorithm, is applied to the images and is found successful in detecting the various topographic characteristics of the surface of the slurry. Pertinent topographic elements are retained and a filtered image is computed based on the general appearance and characteristics of the structures in question. Morphological operators are applied to detect and segment regions of interest. Those regions are then filtered according to their size, elongation, and orientation.Their bounding rectangles are computed and superimposed on the original image. Real time implementation of this algorithm for on-line use is also addressed in this paper. The algorithm is tested on over 500 images of slurry and is found to detect nonuniformities on all 500 images. Locating and characterizing all different size structures is also achieved on all 500 images of the web.
Date: June 23, 1999
Creator: Abidi, B.R.; Goddard, J.S. & Sari-Sarraf, H.
Partner: UNT Libraries Government Documents Department

Feedback damper system for quadrupole oscillations after transition at RHIC.

Description: The heavy ion beam at RHIC undergoes strong quadrupole oscillations just after it crosses transition, which leads to an increase in bunch length making rebucketing less effective. A feedback system was built to damp these quadrupole oscillations and in this paper the characteristics of the system and the results obtained are presented and discussed.
Date: June 23, 2008
Creator: Abreu, N.; Blaskiewicz, M.; Brennan, J. M. & Schultheiss, C.
Partner: UNT Libraries Government Documents Department

The effect of head-on beam-beam compensation on the stochastic boundaries and particle diffusion in RHIC.

Description: To compensate the effects from the head-on beam-beam interactions in the polarized proton operation in the Relativistic Heavy Ion Collider (RHIC), an electron lens (elens) is proposed to collide head-on with the proton beam. We used an extended version of SixTrack for multiparticle beam-beam simulation in order to study the effect of the e-lens on the stochastic boundary and also on diffusion. The stochastic boundary was analyzed using Lyapunov exponents and the diffusion was characterized as the increase in the rms spread of the action. For both studies the simulations were performed with and without the e-lens and with full and partial compensation. Using the simulated values of the diffusion an attempt to calculate the emittance growth rate is presented.
Date: June 23, 2008
Creator: Abreu,N.; Beebe-Wang, J.; FischW; Luo, Y. & Robert-Demolaize, G.
Partner: UNT Libraries Government Documents Department

Energy loss of coasting gold ions and deuterons in RHIC.

Description: The total energy loss of coasting gold ion beams was measured at RHIC at two energies, corresponding to a gamma of 75.2 and 107.4. We describe the experiment and observations and compare the measured total energy loss with expectations from ionization losses at the residual gas, the energy loss due to impedance and synchrotron radiation. We find that the measured energy losses are below what is expected from free space synchrotron radiation. We believe that this shows evidence for suppression of synchrotron radiation which is cut off at long wavelength by the presence of the conducting beam pipe.
Date: June 23, 2008
Creator: Abreu,N.; Blaskiewicz, M.; Brown, K.A.; Butler, J.J.; FischW; Harvey, M. et al.
Partner: UNT Libraries Government Documents Department

Leptoquark searches at the Tevatron

Description: The authors report on searches for leptoquarks using approximately 100 pb {sup -1} of data collected by CDF and DO during Run I at the Tevatron. They also present searches for resonantly-produced leptoquarks that arise in technicolor models. Prospects for future leptoquark searches using Run II data are also discussed.
Date: June 23, 2000
Creator: Acosta, Darin E.
Partner: UNT Libraries Government Documents Department

Tritium Calculations

Description: This report presents calculations to reduce the quantity of tritium released to the environment from the Purex Plant.
Date: June 23, 1970
Creator: Akamine, J.
Partner: UNT Libraries Government Documents Department

Value-impact analysis of regulations for the nuclear industry

Description: This paper summarizes a quantitative tool developed at Lawrence Livermore National Laboratory to aid the NRC in establishing Material Control and Accounting (MC and A) regulations for safeguarding Special Nuclear Material (SNM). Illustrative Value-Impact results of demonstrating the methodology at a facility handling SNM to evaluate alternative safeguards rules is given. The methodology developed also offers a useful framework for facility designers to choose safeguards measures that meet the NRC's criteria in a cost-effective manner. Furthermore, the methodology requires very modest computing capability and is straightforward to apply.
Date: June 23, 1980
Creator: Al-Ayat, R.; Judd, B. & Huntsman, J.
Partner: UNT Libraries Government Documents Department

Explicit SO(10) supersymmetric grand unified model

Description: A complete set of Higgs and matter superfields is introduced with well-defined SO(10) properties and U(1) x Z{sub 2} x Z{sub 2} family charges from which the Higgs and Yukawa superpotentials are constructed. The Higgs fields solve the doublet-triplet splitting problem, while the structures of the four Dirac fermion mass matrices obtained involve just six effective Yukawa operators. The right-handed Majorana matrix arises from one Higgs field coupling to several pairs of superheavy conjugate neutrino singlets. In terms of 10 input parameters to the mass matrices, the model accurately yields the 20 masses and mixings of the lightest quarks and leptons, as well as the masses of the 3 heavy right-handed neutrinos. The bimaximal atmospheric and solar neutrino vacuum solutions are favored in this simplest version.
Date: June 23, 2000
Creator: Albright, Carl H. & Barr, S. M.
Partner: UNT Libraries Government Documents Department

Small-Scale Transonic Investigation of the Effects of Partial-Span Leading-Edge Camber on the Aerodynamic Characteristics of a 50 Degree 38' Sweptback Wing of Aspect Ratio 2.98

Description: "A small-scale transonic investigation of two semispan wings of the same plan form was made in the Langley high-speed 7- by 10-foot tunnel through a Mach number range of 0.70 to 1.10 and a mean-test Reynolds number range of 745,000 to 845,000 to determine the effects of partial-span leading-edge camber on the aerodynamic characteristics of a swept-back wing. This paper presents the results of the investigation of wing-alone and wing-fuselage configurations of the two wings; one, was an uncambered wing and the other had the forward 45 percent of the chord cambered over the outboard 55 percent of the span. The semispan wings had 50deg 38ft sweepback of their quarter-chord lines, aspect ratio of 2.98, taper ratio of 0.45, and modified NACA 64A-series airfoil sections tapered in thickness ratio" (p. 1).
Date: June 23, 1952
Creator: Alford, William J., Jr. & Byrnes, Andrew L., Jr.
Partner: UNT Libraries Government Documents Department

Cosmic ray sun shadow in Soudan 2 underground muon flux.

Description: The absorption of cosmic rays by the sun produces a shadow at the earth. The angular offset and broadening of the shadow are determined by the magnitude and structure of the interplanetary magnetic field (IPMF) in the inner solar system. The authors report the first measurement of the solar cosmic ray shadow by detection of deep underground muon flux in observations made during the entire ten-year interval 1989 to 1998. The sun shadow varies significantly during this time, with a 3.3{sigma} shadow observed during the years 1995 to 1998.
Date: June 23, 1999
Creator: Allison, W. W. M.; Alner, G. J.; Ayres, D. S.; Barrett, W. L.; Bode, C.; Fields, T. H. et al.
Partner: UNT Libraries Government Documents Department

Cygnus X-3 revisited: 10 years of muon and radio observations.

Description: The Soudan 2 deep underground tracking calorimeter has recorded cosmic ray muon tracks from the direction of the galactic x-ray binary Cygnus X-3 on most transits during the interval 1989-1998. We analyze these events in the context of previous reports of Cygnus X-3-related muon flux during major radio flares of that source. We find some evidence for excess flux during a small number of transits coincident with major radio flares. We also find an indication that these events maybe distributed around the source with a Gaussian point spread function with {sigma} = 1.3{degree}, larger than the instrumental angular spread of < 0.3{degree}, verified by observation of the shadow of the moon.
Date: June 23, 1999
Creator: Allison, W. W. M.; Alner, G. J.; Ayres, D. S.; Barrett, W. L.; Bode, C.; Fields, T. H. et al.
Partner: UNT Libraries Government Documents Department

The CDF silicon vertex trigger

Description: The CDF experiment's Silicon Vertex Trigger is a system of 150 custom 9U VME boards that reconstructs axial tracks in the CDF silicon strip detector in a 15 {mu}sec pipeline. SVT's 35 {mu}m impact parameter resolution enables CDF's Level 2 trigger to distinguish primary and secondary particles, and hence to collect large samples of hadronic bottom and charm decays. We review some of SVT's key design features. Speed is achieved with custom VLSI pattern recognition, linearized track fitting, pipelining, and parallel processing. Testing and reliability are aided by built-in logic state analysis and test-data sourcing at each board's input and output, a common inter-board data link, and a universal ''Merger'' board for data fan-in/fan-out. Speed and adaptability are enhanced by use of modern FPGAs.
Date: June 23, 2003
Creator: Ashmanskas, B.; Barchiesi, A. & Bardi, A.
Partner: UNT Libraries Government Documents Department

Proton radiography as a means of material characterization

Description: The authors describe how protons with energies of 800 MeV or greater can be used as radiographic probes for material characterization. A feature which distinguishes protons from x-rays is their charge, which results in multiple Coulomb scattering effects in proton radiographs. Magnetic lensing can ameliorate these effects and even allow mixed substances to be disentangled. They illustrate some of these effects using 800 MeV protons radiographs of a composite step wedge composed of Aluminum, Foam, and Graphite. They discuss how proton radiographs must be manipulated in order to use standard tomographic reconstruction algorithms. They conclude with a brief description of an upcoming experiment, which is performed at Brookhaven National Laboratory at 25 GeV.
Date: June 23, 1999
Creator: Aufderheide, M. B.; Barnes, P. D.; Bionta, R. M.; Hartouni, E. P.; Morris, C. L.; Park, H. S. et al.
Partner: UNT Libraries Government Documents Department

The Uranium-Nitrogen-Carbon System

Description: The ternary system uranium- nitrogen- carbon has been studied at 1800 deg C under vacuum and under a 1atm. nitrogen pressure. There is complete solid solubility between UN and UC, and essentially no solid solubility of nitrogen in UC/sub 2/ or U/sub 2/C/sub 3/ or of carbon in U/sub 2/N/su b 3/. At 1800 deg C the two-phase field, U(C,N) and UC/sub 2/, and the three-phase field, U(C,N), UC/ sub 2/, and C, exist in vacuum or argon. At 1 atm. of nitrogen, the uranium nitrides are more stable than the uranium carbides up to 1800 deg C, but at 2000 deg C, the uranium carbides UC/sub 2/ + U(C,N) become more stable. At 1 atm. of nitrogen, U/sub 2/N/sub 3/ is the stable phase up to 1550 deg C, and U(N,C) solid solution is stable at 1800 deg C. (auth)
Date: June 23, 1958
Creator: Austin, A. E. & Gerds, A. F.
Partner: UNT Libraries Government Documents Department

Nonabelian Monopoles

Description: We study topological as well as dynamical properties of BPS nonabelian magnetic monopoles of Goddard-Nuyts-Olive-Weinberg type in $ G=SU(N)$, $USp(2N)$ and SO(N) gauge theories, spontaneously broken to nonabelian subgroups $H$. We find that monopoles transform under the group dual to $H$ in a tensor representation of rank determined by the corresponding element in $\pi_1(H)$. When the system is embedded in a $\cal N=2$ supersymmetric theory with an appropriate set of flavors with appropriate bare masses, the BPS monopoles constructed semiclassically persist in the full quantum theory. This result supports the identification of"dual quarks'' found at $r$-vacua of $\cal N=2$ theories with the nonabelian magnetic monopoles. We present several consistency checks of our monopole spectra.
Date: June 23, 2004
Creator: Auzzi, Roberto; Bolognesi, Stefano; Evslin, Jarah; Konishi, Kenichi & Murayama, Hitoshi
Partner: UNT Libraries Government Documents Department

Waste retrieval sluicing system campaign number 1 solids volume transferred calculation

Description: This calculation has been prepared to document the volume of sludge removed from tank 241-C-106 during Waste Retrieval Sluicing System (WRSS) Sluicing Campaign No.1. This calculation will be updated, if necessary, to incorporate new data. This calculation supports the declaration of completion of WRSS Campaign No.1 and, as such, is also the documentation for completion of Performance Agreement TWR 1.2.1, C-106 Sluicing Performance Expectations. It documents the performance of all the appropriate tank 241-C-106 mass transfer verifications, evaluations, and appropriate adjustments discussed in HNF-SD-WM-PROC-021, Chapter 23, ''Process Engineering Calculations for Tank 241-C-106 Sluicing and Retrieval''.
Date: June 23, 1999
Creator: BAILEY, J.W.
Partner: UNT Libraries Government Documents Department

WRSS jumper leak assessment

Description: The purpose of this assessment is: (1) to assemble and document the facts associated with three recently installed jumpers which have leaked either during actual process operation or during post installation testing; (2) to describe the corrective actions taken and to identify any process improvements which need to be implemented in the Hanford jumper design and installation activities; and (3) to document WRSS jumper leak lessons learned for use by future projects and other jumper design, fabrication, and installation activities.
Date: June 23, 1999
Creator: BAILEY, J.W.
Partner: UNT Libraries Government Documents Department

Data quality objectives for TWRS privatization phase 1: tank waste transfer control

Description: The Phase 1 privatization contract (DOE-RL 1996) requires that the Project Hanford Management Contractors, on behalf of the U.S. Department of Energy, Richland Operations Office, deliver waste feed in appropriate quantities and composition on schedule. The Feed Process Management Team (FPMT) was created with responsibility for establishing requirements, identifying and recommending baseline change control, assuring configuration management of tank contents (e.g., feed pedigrees), and requiring understanding among the various TWRS elements so the right feed is produced on schedule (Boston 1996). The FPMT has charged the Double Shell Tank (DST) Waste Inventory Control (WIC) (LMHC 1997) group to develop and implement the waste configuration control needed to insure that our ability to deliver feed on schedule is not adversely impacted. The WIC group, which has representatives from engineering, environmental, operations, and waste feed delivery, reviews proposed waste transfers and technical issues affecting the TWRS waste inventory. The WIC group either approves proposed transfers or, if a unanimous decision is not obtained, elevates approval to the FPMT. A representative from the FPMT is present at the WIC group meetings where waste transfer approvals are decided, and WIC relays information to the FPMT as needed. The TWRS operations include waste inventory control, waste consolidation, waste transfers, compatibility evaluations, feed staging for privatization, and technical issues affecting waste transfers. Pumping restrictions are outlined in Boston (1998). The mobilization, retrieval, transfer, pretreatment, staging, and delivery of feed to the privatization contractor take place in the DST system. These tanks support multiple programs; therefore, the tank space must be allocated and controlled so as not to interfere with the delivery of feed by creating space bottlenecks or by significantly changing the composition or quantity of feed. Each feed tank selected for Phase 1 processing has been identified as a source of waste for a particular ...
Date: June 23, 1999
Creator: BANNING, D.L.
Partner: UNT Libraries Government Documents Department

TECHNICAL BASIS FOR VENTILATION REQUIREMENTS IN TANK FARMS OPERATING SPECIFICATIONS DOCUMENTS

Description: This report provides the technical basis for high efficiency particulate air filter (HEPA) for Hanford tank farm ventilation systems (sometimes known as heating, ventilation and air conditioning [HVAC]) to support limits defined in Process Engineering Operating Specification Documents (OSDs). This technical basis included a review of older technical basis and provides clarifications, as necessary, to technical basis limit revisions or justification. This document provides an updated technical basis for tank farm ventilation systems related to Operation Specification Documents (OSDs) for double-shell tanks (DSTs), single-shell tanks (SSTs), double-contained receiver tanks (DCRTs), catch tanks, and various other miscellaneous facilities.
Date: June 23, 2003
Creator: BERGLIN, E J
Partner: UNT Libraries Government Documents Department

Toward Net Energy Buildings: Design, Construction, and Performance of the Grand Canyon House

Description: The Grand Canyon house is a joint project of the DOE's National Renewable Energy Laboratory and the U.S. National Park Service and is part of the International Energy Agency Solar Heating and Cooling Programme Task 13 (Advanced Solar Low-Energy Buildings). Energy consumption of the house, designed using a whole-building low-energy approach, was reduced by 75% compared to an equivalent house built in accordance with American Building Officials Model Energy Code and the Home Energy Rating System criteria.
Date: June 23, 1999
Creator: Balcomb, J. D.; Hancock, C. E. & Barker, G.
Partner: UNT Libraries Government Documents Department

Assessing the Proliferation Resistance of Innovative Nuclear Fuel Cycles

Description: The National Nuclear Security Administration is developing methods for nonproliferation assessments to support the development and implementation of U.S. nonproliferation policy. This paper summarizes the key results of that effort. Proliferation resistance is the degree of difficulty that a nuclear material, facility, process, or activity poses to the acquisition of one or more nuclear weapons. A top-level measure of proliferation resistance for a fuel cycle system is developed here from a hierarchy of metrics. At the lowest level, intrinsic and extrinsic barriers to proliferation are defined. These barriers are recommended as a means to characterize the proliferation characteristics of a fuel cycle. Because of the complexity of nonproliferation assessments, the problem is decomposed into: metrics to be computed, barriers to proliferation, and a finite set of threats. The spectrum of potential threats of nuclear proliferation is complex and ranges from small terrorist cells to industrialized countries with advanced nuclear fuel cycles. Two general categories of methods have historically been used for nonproliferation assessments: attribute analysis and scenario analysis. In the former, attributes of the systems being evaluated (often fuel cycle systems) are identified that affect their proliferation potential. For a particular system under consideration, the attributes are weighted subjectively. In scenario analysis, hypothesized scenarios of pathways to proliferation are examined. The analyst models the process undertaken by the proliferant to overcome barriers to proliferation and estimates the likelihood of success in achieving a proliferation objective. An attribute analysis approach should be used at the conceptual design level in the selection of fuel cycles that will receive significant investment for development. In the development of a detailed facility design, a scenario approach should be undertaken to reduce the potential for design vulnerabilities. While, there are distinctive elements in each approach, an analysis could be performed that utilizes aspects of each approach.
Date: June 23, 2003
Creator: Bari, R.; Roglans, J.; Denning, R. & Mladineo, S.
Partner: UNT Libraries Government Documents Department