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The 0/sup +/ /minus/ 1/sup +/ A = 4. lambda. -hypernuclei binding energy difference in an exact equation, separable potential calculation
None
Date:
January 1, 1988
Creator:
Gibson, B. F. & Lehman, D. R.
Object Type:
Article
System:
The UNT Digital Library
1-D closure models for slender 3-D viscoelastic free jets: von Karman flow geometry and elliptical cross section
In this paper we derive one space dimensional, reduced systems of equations (1-D closure models) for viscoelastic free jets. We begin with the three-dimensional system of conservation laws and a Maxwell-Jeffreys constitutive law for an incompressible viscoelastic fluid. First, we exhibit exact truncations to a finite, closed system of 1-D equations based on classical velocity assumptions of von Karman. Next, we demonstrate that the 3-D free surface boundary conditions overconstrain these truncated systems, so that only a very limited class of solutions exist. We then proceed to derive approximate 1-D closure theories through a slender jet asymptotic scaling, combined with appropriate definitions of velocity, pressure and stress unknowns. Our nonaxisymmetric 1-D slender jet models incorporate the physical effects of inertia, viscoelasticity (viscosity, relaxation and retardation), gravity, surface tension, and properties of the ambient fluid, and include shear stresses and time dependence. Previous special 1-D slender jet models correspond to the lowest order equations in the present asymptotic theory by an a posteriori suppression to leading order of some of these effects, and a reduction to axisymmetry. Solutions of the lowest order system of equations in this asymptotic analysis are presented: For the special cases of elliptical inviscid and Newtonian free …
Date:
January 1, 1988
Creator:
Bechtel, S. E.; Forest, M. G.; Holm, D. D. & Lin, K. J.
Object Type:
Article
System:
The UNT Digital Library
2. 5 MeV neutron source for fission cross section measurement
A 2.5 MeV neutron source has been established on the beamline of a 100 kV, 0.5 ma ion accelerator. The ion accelerator provides a 100 kV deuteron beam of about 200 ..mu..a into a 3 mm beam spot at the target position. The neutron source is produced by the D(d,n)/sup 3/He reaction with a yield of about 10/sup 7/ n/sec. The time-correlated associated particle method (TCAP) is utilized for the neutron fluence determination and for neutron background elimination. The /sup 3/He associated particles are detected at 90 degrees behind a thin aluminum foil and the corresponding neutrons are emitted at 73.5 degrees with an energy near 2.5 MeV. Also, the protons from the competing D(d,p)T reaction are monitored at 135 degrees for normalization and diagnostic purposes. A fission chamber containing six uranium tetrafluoride deposits has been designed for use in the /sup 235/U(n,f) cross section measurement at 2.5 MeV. The 5 cm diameter deposits range in thickness from 230--300 ..mu..g/cm/sup 2/ and are expected to have good uniformity. A description of the 2.5 MeV neutron source facility is presented along with details of the associated particle detection and neutron beam characteristics. Preparations for the fission cross section measurement are discussed. …
Date:
January 1, 1988
Creator:
Duvall, K. C.; Wasson, O. A. & Ma, Honchang
Object Type:
Article
System:
The UNT Digital Library
3-D magnetic field calculations for wiggglers using MAGNUS-3D
The recent but steady trend toward increased magnetic and geometric complexity in the design of wigglers and undulators, of which tapered wigglers, hybrid structures, laced electromagnetic wigglers, magnetic cladding, twisters and magic structures are examples, has caused a need for reliable 3-D computer models and a better understanding of the behavior of magnetic systems in three dimensions. The capabilities of the MAGNUS-3D Group of Programs are ideally suited to solve this class of problems and provide insight into 3-D effects. MAGNUS-3D can solve any problem of Magnetostatics involving permanent magnets, linear or nonlinear ferromagnetic materials and electric conductors of any shape in space. The magnetic properties of permanent magnets are described by the complete nonlinear demagnetization curve as provided by the manufacturer, or, at the user's choice, by a simpler approximation involving the coercive force, the residual induction and the direction of magnetization. The ferromagnetic materials are described by a magnetization table and an accurate interpolation relation. An internal library with properties of common industrial steels is available. The conductors are independent of the mesh and are described in terms of conductor elements from an internal library.
Date:
January 1, 1988
Creator:
Pissanetzky, S. & Tompkins, P.
Object Type:
Article
System:
The UNT Digital Library
A 4. pi. tracking magnetic spectrometer for RHIC
A tracking magnetic spectrometer based on large Time Projection Chambers (TPC) was previously proposed to measure the momentum of charged particles emerging from the RHIC beam pipe at angles larger than four degrees and to identify the particle type for those beyond fifteen degrees with momenta up to 700 MeV/c, which is a large fraction of the final charged particles emitted by a low cm rapidity quark-gluon plasma. Experimental progress in the successful performance of a TPC developed for AGS E-810 is reported. We have also included typical results of our event generator which contains an interface of an improved HIJET and a plasma bubble model. Typical plasma signals one can expect from this model are presented. 4 refs., 9 figs.
Date:
January 1, 1988
Creator:
Lindenbaum, S. J.
Object Type:
Article
System:
The UNT Digital Library
1988 DOE model conference proceedings: Volume 1
These Proceedings of the October 3-7, 1988, DOE Model Conference are a compilation of the papers that were presented in the technical or poster sessions at the conference. Papers and posters not submitted for publication are not included in the Proceedings. The Table of Contents lists the titles of papers as well as the names of the presenters. These individuals are not, in all cases, the primary authors of the papers published. The actual title pages, appearing later with the papers, show the primary author(s) and all co-authors. The papers in all three volumes of the Proceedings appear as they were originally submitted for publication and have not been edited or changed in any way. Topics included in Volume 1 are Environmental Data Management, Site characterization technology, Wastewater treatment, Waste management in foreign countries, Transuranic waste management, and Groundwater characterization and treatment.
Date:
January 1, 1988
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
1988 DOE model conference proceedings: Volume 3
These Proceedings of the October 3 - 7, 1988, DOE Model Conference are a compilation of the papers that were presented in the technical or poster sessions at the conference. Papers and posters not submitted for publication are not included in the Proceedings. The Table of Contents lists the titles of papers as well as the names of the presenters. These individuals are not, in all cases, the primary authors of the papers published. The actual title pages, appearing later with the papers, show the primary author(s) and all co-authors. The papers in all three volumes of the proceedings appear as they were originally submitted for publication and have not been edited or changed in any way. Topics included in Volume 3 include treatment of soils, waste characterization and certification, waste minimization site remediation management plans and programs, and training programs.
Date:
January 1, 1988
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
1988 DOE model conference proceedings: Volume 4
These Proceedings of the October 3-7, 1988, DOE Model Conference are a compilation of the papers that were presented in the technical or poster sessions at the conference. Papers and posters not submitted for publication are not included in the Proceedings. The Table of Contents lists the titles of papers as well as the names of the presenters. These individuals are not, in all cases, the primary authors of the papers published. The actual title pages, appearing later with the papers, show the primary author(s) and all co-authors. The papers in all three volumes of the Proceedings appear as they were originally submitted for publication and have not been edited or changed in any way. Topics discussed in Volume 4 include site characterization and remediation projects, environmental monitoring and modeling; disposal site selection and facility design, risk assessment, safety and health issues, and site remediation technology.
Date:
January 1, 1988
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
1988 DOE model conference proceedings: Volume 5
These Proceedings of the October 3--7, 1988 DOE Model Conference are a compilation of the papers that were presented in the technical or poster sessions at the conference papers and posters not submitted for publication are not included in the Proceedings. The Table of Contents lists the titles of papers as well as the names of the presenters. These individuals are not, in all cases, the primary authors of the papers published. The actual title pages, appearing later with the papers, show the primary author(s) and all co-authors. The papers in all three volumes of the Proceedings appear as they were originally submitted for publication and have not been edited or changed in any way. Topics discussed in Volume 5 include environmental assessments and program strategies, waste treatment technologies, and regulations and compliance studies.
Date:
January 1, 1988
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
2D Full-Wave Modeling of ICRH With Finite E/Parallel/
In this paper, the Oak Ridge ion cyclotron wave propagation code ORION has been extended to include nonzero E/parallel/ in both axisymmetric tokamak and helically symmetric stellarator geometries. Flux surfaces, conducting boundaries, and antennas can be of arbitrary shape, and antenna current is assumed to be divergence free (not a necessary assumption). Cartesian coordinates eliminate the singularity that occurs at the origin of cylindrical coordinate systems. In this paper we consider two alternative numerical approaches to this problem. One solves Maxwell's equations directly in terms of the electric field /rvec E/. The second approach introduces the electromagnetic potentials /rvec A/ and /phi/ with the Coulomb gauge /triangledown/ /center dot/ /rvec A/ = 0. 7 refs., 4 figs.
Date:
January 1, 1988
Creator:
Batchelor, D. B.; Jaeger, E. F. & Weitzner, H.
Object Type:
Article
System:
The UNT Digital Library
6th target fabrication specialists meeting: Proceedings, June 23, 1988 Sessions
The following papers were presented at the meeting: Laser Target Fabrication at the Naval Research Laboratory; High-Sensitivity Radiography Detects Very Small Defects in Laser Fusion Targets; Ablation Layer Coating on Inertial Fusion Targets at Laboratory for Laser Energetics; X-Ray Microscopy of Inertial Fusion Targets Using a Laser Produced Plasma as an X-Ray Source; A Study of Factors Affecting The Deposition of Smooth Plasma Polymers; Composite Foams; Low-Density Resorcinol-Formaldehyde Foams for Direct-Drive Laser ICF Targets; Low-Density Polystyrene Foams For Direct-Drive Laser ICF Targets; Characterization of Low-Density Materials and Their Precursers; and Low-Voltage Scanning Electron Microscopy of Target Materials. (JF)
Date:
January 1, 1988
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
Ab initio studies of transition-metal dihydrogen chemistry
Examples of transition metal complexes containing dihydrogen ligands are investigated using ab initio electronic structure calculations employing effective core potentials. Calculated geometrical structures and relative energies of various forms of WL/sub 5/(H/sub 2/) complexes (L = CO, PR/sub 3/) are reported, and the influence of the ligand on the relative stabilities of the dihydrogen and dihydride forms is studied. The possible intramolecular mechanisms for H/D scrambling are investigated in another d/sup 6/ complex, Cr(CO)/sub 4/(H/sub 2/)/sub 2/, where various polyhydride intermediates are possible. 8 refs., 6 figs., 1 tab.
Date:
January 1, 1988
Creator:
Kober, E. M. & Hay, P. J.
Object Type:
Article
System:
The UNT Digital Library
Absolute calibration of a SPRED (Spectrometer Recording Extended Domain) EUV (extreme ultraviolet) spectrograph for use on the DIII-D tokamak
We have performed an absolute intensity calibration of a SPRED multichannel EUV spectrograph using synchrotron radiation from the NBS SURF-II electron storage ring. The calibration procedure and results for both a survey grating (450 g/mm) and a high-resolution (2100 g/mm) grating are presented. The spectrograph is currently in use on the DIII-D tokamak with a tangential line-of-sight at the plasma midplane. Data is first acquired and processed by a microcomputer; the absolute line intensities are then sent to the DIII-D database for comparison with data from other diagnostics. Representative data from DIII-D plasma operations will be presented. 6 refs., 3 figs., 1 tab.
Date:
January 1, 1988
Creator:
Wood, R. D. & Allen, S. L.
Object Type:
Article
System:
The UNT Digital Library
Accelerated aging of cellulose by laser irradiation. [Development for Shroud of Turin]
We describe a new technique for studying thermally-induced chemical transformations in cellulose developed for the Shroud of Turin. The apparatus consists of a carbon dioxide laser for heating, an infrared thermometer, and an optical reflectance spectrometer for tracking the progressive discoloration of the sample. To illustrate the technique, we present measurements from a single piece of sample linen along five isotherms in the range 200-290/degree/C. The results are explained in terms of first-order chemical rate theory and a four-step model. From the measurements we derive the activation energies, Arrhenius constants, and reflectivities of the chromophoric states. 4 refs., 2 figs., 1 tab.
Date:
January 1, 1988
Creator:
Jackson, J. P.; Arthurs, E.; Schwalbe, L. A.; Sega, R. M.; Windish, D.; Long, W. H. et al.
Object Type:
Article
System:
The UNT Digital Library
The accelerator automation application toolkit workshop presentations
Over the past 18 months on the GTA project at Los Alamos, we have been developing tools for building control systems for accelerators. The first tool developed has already demonstrated greatly reduced requirements for conventional computer programming in applying control systems to an accelerator. Even in the early stages, this work has received considerable attention and the system is currently being investigated or used at several other institutes. Further tools are either in the conceptual design, design, or implementation phase. Over the same period, a group at CERN has been developing the ideas and design for a generic software kit for the application of a control system to accelerators. The CERN software kit also addresses the technical management and documentation aspects of control systems. The purpose of the AT Division effort and the CERN kit is to greatly simplify the implementation and lifetime maintenance of an accelerator control system. Experience has shown that accelerator control systems are also applicable to other experimental physics machines. The purpose of the workshop was to explore these ideas and developments as well as other relevant developments in the field, to verify the viability of the concepts, and to develop further the written specifications for …
Date:
January 1, 1988
Creator:
Howell, J. A.; Bjorklund, E. A.; Clout, P. N.; Dalesio, L. R.; Kozubal, A. J.; Mottershead, C. T. et al.
Object Type:
Article
System:
The UNT Digital Library
Accelerator physics in RHIC (Relativistic Heavy Ion Collider)
RHIC (for Relativistic Heavy Ion Collider) is a colliding beam facility to be built at BNL in the tunnel system that was constructed for the defunct ISABELLE/CBA project. It is intended for the study of collisions between fully stripped ions of the same or different species with magnetic rigidities of up to at least 839.5 Tm, corresponding with an energy of 100 GeV/amu (amu for atomic mass unit) for particles with A/Z = 2.5, and 251 GeV for protons. There are six potential crossing regions, each with, initially, time average luminosities of up to a few times 10/sup 26/ cm/sup -2/ sec/sup -1/ for Au, with luminosity life-times of 10 hours for Au, and longer for the lighter ions. The initial proton-proton luminosity will be about 10/sup 31/ cm/sup -2/ sec/sup -1/. The rms length of the interaction diamond is 0.2 m when the beams collide colinearly, it is determined by the lengths of the colliding bunches. The diamond length can be reduced by having the beams cross at an angle, but this reduces the luminosity. The magnitude of the crossing angle is restricted geometrically in dependence of the energies and species of the interacting ions and possibly also by …
Date:
January 1, 1988
Creator:
Claus, J.
Object Type:
Article
System:
The UNT Digital Library
Accident Management for Severe Accidents
The management of severe accidents in light water reactors is receiving much attention in several countries. The reduction of risk by measures and/or actions that would affect the behavior of a severe accident is discussed. The research program that is being conducted by the US Nuclear Regulatory Commission focuses on both in-vessel accident management and containment and release accident management. The key issues and approaches taken in this program are summarized. 6 refs.
Date:
January 1, 1988
Creator:
Bari, R. A.; Pratt, W. T.; Lehner, J.; Leonard, M.; Disalvo, R. & Sheron, B.
Object Type:
Article
System:
The UNT Digital Library
ACE: AMY CDC (Central Drift Chamber) Fast Track Finder
The central drift chamber (CDC) of the AMY detector at the TRISTAN e/sup /+//e/sup /-// collider features its fine granularity and multi-band structure. The tracking software named ACE which makes the most of these features shows an excellent performance for reconstruction of high multiplicity events with highly collimated jets. The obtained reconstruction efficiency is 97% for the particles coming from within 5 cm of the primary vertex with p/sub t/ /approx gt/ 500 MeVc in the simulated hadronic events. The processing time is on average less than 300 ms per hadronic event (simulated or real) on a FACOM M-382 computer. 3 refs., 5 figs.
Date:
January 1, 1988
Creator:
Mori, T.
Object Type:
Article
System:
The UNT Digital Library
Achromatic lattice comparison for light sources
The next generation of synchrotron light sources are being designed to support a large number of undulators and require long dispersion-free insertion regions. With less demand for radiation from the dipole magnets, the storage ring cost per undulator beam can be reduced by decreasing the number of dipole magnets and increasing the number of dispersion free straight sections. The two simplest achromatic lattices are the Chasman-Green or double-bend achromatic (DBA) and the three-bend achromat (TBA). The DBA in its simplest form consists of a single horizontally-focussing quadrupole between the two dipole magnets. Since this quadrupole strength is fixed by the achromatic condition, the natural emittance (/var epsilon//sub n/) may vary as the beta functions in the insertion region (IR) are varied. The expanded Chasman-Green (also DBA) uses multiple quadrupoles in the dispersive section to provide emittance control independent of the beta functions in the IR. Although this provides flexibility in the ID beta functions, the horizontal phase advance is constrained to /phi/ /approx equal/ 180/degree/ between approximately the centers of the dipole magnets. If small /var epsilon//sub n/ is required, the horizontal phase advance between the dipoles will be near one and the lattice properties will be dominated by this …
Date:
January 1, 1988
Creator:
Kramer, S. L.; Crosbie, E. A. & Cho, Y.
Object Type:
Article
System:
The UNT Digital Library
ACRR (Annular Core Research Reactor) fission product release tests: ST-1 and ST-2
Two experiments (ST-1 and ST-2) have been performed in the Annular Core Research Reactor (ACER) at Sandia National Laboratories (SNLA) to obtain time-resolved data on the release of fission products from irradiated fuels under light water reactor (LWR) severe accident conditions. Both experiments were conducted in a highly reducing environment at maximum fuel temperatures of greater than 2400 K. These experiments were designed specifically to investigate the effect of increased total pressure on fission product release; ST-1 was performed at approximately 0.16 MPa and ST-2 was run at 1.9 MPa, whereas other parameters were matched as closely as possible. Release rate data were measured for Cs, I, Ba, Sr, Eu, Te, and U. The release rates were higher than predicted by existing codes for Ba, Sr, Eu, and U. Te release was very low, but Te did not appear to be sequestered by the zircaloy cladding; it was evenly distributed in the fuel. In addition, in posttest analysis a unique fuel morphology (fuel swelling) was observed which may have enhanced fission product release, especially in the high pressure test (ST-2). These data are compared with analytical results from the CORSOR correlation and the VICTORIA computer model. 8 refs., 8 figs., …
Date:
January 1, 1988
Creator:
Allen, M. D.; Stockman, H. W.; Reil, K. O.; Grimley, A. J. & Camp, W. J.
Object Type:
Article
System:
The UNT Digital Library
Activity report: A report of research activity in fiscal years 1986 and 1987
This report summarizes the last elements of work conducted in this program prior to its termination at the end of FY 87. The work was primarily an analysis of a fuel cell electrocatalyst using electron microscopy. The catalyst was a three component system containing Pt-Co-Ni (3:2:2 atomic ratios) dispersed on an amorphous carbon support in unknown phases, supplied to us by Giner Inc. (designated as their sample no. G82-5-19). The preparation of this catalyst is proprietary, (patent pending). Our objective was to analyze the catalyst by a variety of techniques to determine, to the greatest extent possible, the distribution of the three elements on the carbon support along with identification of their chemical states and phases.
Date:
January 1, 1988
Creator:
Ross, P.N.; Beard, B. & Sattler, M.
Object Type:
Report
System:
The UNT Digital Library
Acute radiation syndrones and their management
Radiation syndromes produced by large doses of ionizing radiation are divided into three general groups depending on dose of radiation and time after exposure. The CNS syndrome requires many thousands of rad, appears in minutes to hours, and kills within hours to days. The GIS appears after doses of a few hundred to 2000 rad. It is characterized by nausea, vomiting, diarrhea, and disturbances of water and electrolyte metabolism. It has a high mortality in the first week after exposure. Survivors will then experience the HS as a result of marrow aplasia. Depending on dose, survival is possible with antibiotic and transfusion therapy. The relationship of granulocyte depression to mortality in dogs and human beings is illustrated. The role of depth dose pattern of mortality of radiation exposure is described and used as an indication of why air exposure doses may be misleading. The therapy of radiation injury is described based on antibiotics, transfusion therapy, and use of molecular regulators. The limited role of matched allogenic bone marrow transplants is discussed. 52 refs., 13 figs.
Date:
January 1, 1988
Creator:
Cronkite, E.P.
Object Type:
Article
System:
The UNT Digital Library
Acute toxicity of uranium hexafluoride, uranyl fluoride and hydrogen fluoride
Uranium hexafluoride (UF/sub 6/) released into the atmosphere will react rapidly with moisture in the air to form the hydrolysis products uranyl fluoride (UO/sub 2/F/sub 2/) and hydrogen fluoride (HF). Uranium compounds such as UF/sub 6/ and UO/sub 2/F/sub 2/ exhibit both chemical toxicity and radiological effects, while HF exhibits only chemical toxicity. This paper describes the development of a methodology for assessing the human health consequences of a known acute exposure to a mixture of UF/sub 6/, UO/sub 2/F/sub 2/, and HF. 4 refs., 2 figs., 5 tabs.
Date:
January 1, 1988
Creator:
Just, Robert A.
Object Type:
Article
System:
The UNT Digital Library
Advanced alternate planar geometry solid oxide fuel cells
The following Ceramatec tasks are reported: electrolyte development and fabrication, edge seal development/fabrication, electrode, and interconnector. The following IGT tasks are reported: cell design analysis, and program liaison and test facility preparation.
Date:
January 1, 1988
Creator:
Prouse, D.; Elangovan, S.; Khandkar, A. (Ceramatec, Inc., Salt Lake City, UT (United States)); Donelson, R. & Marianowski, L. (Institute of Gas Technology, Chicago, IL (United States))
Object Type:
Report
System:
The UNT Digital Library