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3,579 Matching Results
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3-D Analysis on Arbitrarily-Shaped Icrf Antennas and Faraday Shields
Cavity antennas with Faraday shields are proposed to couple ion cyclotron radio frequency power for heating fusion plasmas. This application requires small, high-power, low-frequency antennas. The results are presented of a theoretical study of the ICRF antennas being developed for this purpose at the Radio Frequency Test Facility (RFTF). The objectives of this work are to optimize experimental designs and to confirm test results. (MOW)
Date:
January 1, 1986
Creator:
Chen, G. L.; Whealton, J. H.; Baity, F. W.; Hoffman, D. J. & Owens, T. L.
Object Type:
Article
System:
The UNT Digital Library
1986 annual information meeting. Abstracts
Abstracts are presented for the following papers: Geohydrological Research at the Y-12 Plant (C.S. Haase); Ecological Impacts of Waste Disposal Operations in Bear Creek Valley Near the Y-12 Plant (J.M. Loar); Finite Element Simulation of Subsurface Contaminant Transport: Logistic Difficulties in Handling Large Field Problems (G.T. Yeh); Dynamic Compaction of a Radioactive Waste Burial Trench (B.P. Spalding); Comparative Evaluation of Potential Sites for a High-Level Radioactive Waste Repository (E.D. Smith); Changing Priorities in Environmental Assessment and Environmental Compliance (R.M. Reed); Ecology, Ecotoxicology, and Ecological Risk Assessment (L.W. Barnthouse); Theory and Practice in Uncertainty Analysis from Ten Years of Practice (R.H. Gardner); Modeling Landscape Effects of Forest Decline (V.H. Dale); Soil Nitrogen and the Global Carbon Cycle (W.M. Post); Maximizing Wood Energy Production in Short-Rotation Plantations: Effect of Initial Spacing and Rotation Length (L.L. Wright); and Ecological Communities and Processes in Woodland Streams Exhibit Both Direct and Indirect Effects of Acidification (J.W. Elwood).
Date:
January 1, 1986
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
1986 USSR-US Exchange II. 4. Topical meeting: magnetic configurations, plasma equilibrium, and stability of stellarators. Volume I. Soviet presentations
Separate abstracts for each paper are included in the data base. (MOW)
Date:
January 1, 1986
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
1986 USSR-US Exchange II. 4. Topical meeting: magnetic configurations, plasma equilibrium, and stability of stellarators. Volume II. US presentations
Separate abstracts were prepared for each of the included papers. (MOW)
Date:
January 1, 1986
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
3d-3p transitions in (. mu. /sup -/He/sup 4/)/sup +/
An experiment to measure the energy of 3d-3p transitions in the (..mu../sup -/He/sup 4/)/sup +/ ion is now in progress. The experiment, which is being performed at the Brookhaven National Laboratory Alternating Gradient Synchrotron, will use an infrared CO/sub 2/ laser to stimulate the transitions. These transitions are of interest because their energy is due almost entirely to the polarization of the vacuum. In a pure Coulomb field, states with the same principal quantum number, n, and total angular momentum, J, are degenerate. Vacuum polarization, because of its nonlinear dependence on electric field strength, results in departure from an inverse square Coulomb field, causing a splitting which depends on the orbital angular momentum, removing the degeneracy. The dominance of vacuum polarization in giving rise to these splittings in the muonic ion is in contrast to the situation in electronic atoms where vacuum polarization makes a very minor contribution to the Lamb shift. 4 refs., 4 figs.
Date:
January 1, 1986
Creator:
May, M.
Object Type:
Article
System:
The UNT Digital Library
Accelerated beam experiments with the ORNL SITEX (Surface Ionization with Transverse Extraction) and VITEX (Volume Ionization with Transverse Extraction) H/sup -//D/sup -/ sources
Beam parameters have been measured for both the Surface Ionization with Transverse Extraction (SITEX) and Volume Ionization with Transverse Extraction (VITEX) H/sup -//D/sup -/ ion sources. Both sources use a reflex discharge to generate the main plasma. Beam energies up to 18 keV were used for pulse lengths up to several seconds. For SITEX, Faraday cup magnetically analyzed D/sup -/ beam currents of 110 mA at extraction densities of 48 mA/cm/sup 2/ and at a source ion temperature of 4 eV have been measured. For the VITEX results, Faraday cup magnetically analyzed beam currents of up to 80 mA at extraction densities of 27 mA/cm/sup 2/ and at a source ion temperature of 0.5 eV have been measured. Virtually all extracted electrons were recovered at an energy of 10 to 30% of the accel beam energy, and there were none in the analyzed beam.
Date:
January 1, 1986
Creator:
Dagenhart, W. K.; Tsai, C. C.; Stirling, W. L.; Ryan, P. M.; Schechter, D. E.; Whealton, J. H. et al.
Object Type:
Article
System:
The UNT Digital Library
Acceleration of electrons by the wake field of proton bunches
This paper discusses a novel idea to accelerate low-intensity bunches of electrons (or positrons) by the wake field of intense proton bunches travelling along the axis of a cylindrical rf structure. Accelerating gradients in excess of 100 MeV/m and large ''transformer ratios'', which allow for acceleration of electrons to energies in the TeV range, are calculated. A possible application of the method is an electron-positron linear collider with luminosity of 10/sup 33/ cm/sup -2/ s/sup -1/. The relatively low cost and power consumption of the method is emphasized.
Date:
January 1, 1986
Creator:
Ruggiero, Alessandro G.
Object Type:
Article
System:
The UNT Digital Library
The acceptance of the SSC (Superconducting Supercollider) clustered lattice
The physical apertures of all elements of the SSC storage lattices are considered to determine whether correction of random multipole fields in the triplet quadrupoles is necessary when betatron amplitudes there are no more than the inner radius of the beam pipe. During computer simulated beam tracking the influence of random multiple fields was included as a kick given to the test particle at the center of each quadrupole and at the ends of every dipole. The degree of multipole correction needed is shown. (LEW)
Date:
January 1, 1986
Creator:
Dell, G.F.
Object Type:
Article
System:
The UNT Digital Library
Accuracy of Nodal Transport and Simplified-P3 Fluxes in Benchmark Tests
Here we summarize recent work exploring the accuracy of fluxes computed, both by nodal transport methods, and by the simplified-spherical harmonics (SP/sub l/) method. Apparently, significant errors in nodal transport fluxes were first noted by Wagner et al., and attributed to the isotopic-transverse-leakage (ITL) approximation. Later Lawrence detected substantial errors, due to the ITL approximation, in his nodal transport (NTT) solution of the IAEA Stepanek benchmark problem. Gelbard concluded on theoretical grounds that nodal transport fluxes, computed in XY geometry using ITL, should be much more accurate on the coordinate axes than halfway between them and that, at 45/sup 0/ from the axes, nodal transport methods using ITL should give only about half of the true transport correction.
Date:
January 1, 1986
Creator:
Liu, Y.W.H. & Gelbard, E.M.
Object Type:
Article
System:
The UNT Digital Library
Accurate interatomic potentials for Ni, Al and Ni/sub 3/Al
To obtain meaningful results from atomistic simulations of materials, the interatomic potentials must be capable of reproducing the thermodynamic properties of the system of interest. Pairwise potentials have known deficiencies that make them unsuitable for quantitative investigations of defective regions such as crack tips and free surfaces. Daw and Baskes (Phys. Rev. B 29, 6443 (1984)) have shown that including a local ''volume'' term for each atom gives the necessary many-body character without the severe computational dependence of explicit n-body potential terms. Using a similar approach, we have fit an interatomic potential to the Ni/sub 3/Al alloy system. This potential can treat diatomic Ni/sub 2/, diatomic Al/sub 2/, fcc Ni, fcc Al and L1/sub 2/ Ni/sub 3/Al on an equal footing. Details of the fitting procedure are presented, along with the calculation of some properties not included in the fit.
Date:
January 1, 1986
Creator:
Voter, Arthur F. & Chen, Shao Ping
Object Type:
Article
System:
The UNT Digital Library
Acid-split flowsheets for uranium-plutonium partitioning without a reductant
The flowsheet discussed has been tested in a hot cell experiment using 10% TBP and a poorly controlled temperature near 15/sup 0/C. The test was carried out in the Solvent Extraction Test Facility at Oak Ridge National Laboratory, using highly irradiated mixed-oxide fuel from the Fast Flux Test Facility reactor at Hanford, Washington. The observed concentration profiles for U, Pu, and acid are shown graphically.
Date:
January 1, 1986
Creator:
Campbell, D.O.; Crouse, D.J. & Mills, A.L.
Object Type:
Article
System:
The UNT Digital Library
Acoustic damping for explicit calculations of fluid flow at low Mach number
A method is proposed for damping the sound waves in explicit calculations of fluid flow at low Mach number, where sound waves are usually not of interest but may distract attention from other flow features. The method is based on the introduction of an artificial pressure q of the form q = - q/sub 0/rhoc/sup 2/..delta..t(del x u - del x u/sub 0/), where q/sub 0/ is a coefficient of order unity, rho is the density, c is the sound speed, ..delta..t is the time step, and u/sub 0/ is the velocity field that would obtain at zero Mach number. When del x u/sub 0/ is zero, the method becomes equivalent to the use of an artificial bulk viscosity q/sub 0/rhoc/sup 2/..delta..t. However, del x u/sub 0/ can be substantially different from zero in problems with heat or mass sources (e.g., combustion), and its inclusion is then essential to obtain the correct pressure field. The method is well suited for use in conjunction with explicit numerical schemes that employ acoustic subcycling or artificial reduction of the sound speed for improved efficiency at low Mach number. The beneficial effects of the method are illustrated by means of calculations with an acoustic …
Date:
January 1, 1986
Creator:
Ramshaw, J. D.; O'Rourke, P. J. & Amsden, A. A.
Object Type:
Report
System:
The UNT Digital Library
Acoustic velocity measurements on fluid metals from two-fold compressions to two-fold expansions
Methods used for making acoustic velocity measurements on samples which are destroyed in time scales of milliseconds or less are described. Analytic techniques for using this data to calculate thermodynamic quantities are outlined. New results indicating a linear relationship of acoustic velocity with density over a very large density range are presented. 30 refs., 5 figs. (DWL)
Date:
January 1, 1986
Creator:
Shaner, J. W.; Hixson, R. S.; Winkler, M. A. & Brown, J. M.
Object Type:
Article
System:
The UNT Digital Library
Acoustic wave scattering from a circular crack: comparison of different computational methods
The work reported was motivated by disagreement between the results obtained from two computations of scattering of an axially incident elastic p-wave on a circular crack. One calculation involves the direct solution of the Helmholtz integral equation, showing an oscillating total cross section. The other uses a program called MOOT, in which the elastic displacement near the crack is expanded in regular spherical eigenfunctions of the elastic wave equation. This calculation shows that the oscillations in total cross section disappear rapidly at high wave numbers. The conjecture that the basis for the MOOT expansion was inappropriate is examined by application to a test problem. Results indicate that there is no inadequacy in the spherical basis set. (LEW)
Date:
January 1, 1986
Creator:
Visscher, W.M.
Object Type:
Article
System:
The UNT Digital Library
Actinide removal from nitric acid waste streams
Actinide separations research at the Rocky Flats Plant (RFP) has found ways to significantly improve plutonium secondary recovery and americium removal from nitric acid waste streams generated by plutonium purification operations. Capacity and breakthrough studies show anion exchange with Dowex 1x4 (50 to 100 mesh) to be superior for secondary recovery of plutonium. Extraction chromatography with TOPO(tri-n-octyl-phosphine oxide) on XAD-4 removes the final traces of plutonium, including hydrolytic polymer. Partial neutralization and solid supported liquid membrane transfer removes americium for sorption on discardable inorganic ion exchangers, potentially allowing for non-TRU waste disposal.
Date:
January 1, 1986
Creator:
Muscatello, A.C. & Navratil, J.D.
Object Type:
Article
System:
The UNT Digital Library
Activation analysis of the compact ignition tokamak
The US fusion program has completed the conceptual design of a compact tokamak device that achieves ignition. The high neutron wall loadings associated with this compact deuterium-tritium-burning device indicate that radiation-related issues may be significant considerations in the overall system design. Sufficient shielding will be requied for the radiation protection of both reactor components and occupational personnel. A close-in igloo shield has been designed around the periphery of the tokamak structure to permit personnel access into the test cell after shutdown and limit the total activation of the test cell components. This paper describes the conceptual design of the igloo shield system and discusses the major neutronic concerns related to the design of the Compact Ignition Tokamak.
Date:
January 1, 1986
Creator:
Selcow, E.C.
Object Type:
Article
System:
The UNT Digital Library
Active internal corrector coils
Trim or corrector coils to correct main magnet field errors and provide higher multipole fields for beam optics purposes are a standard feature of superconducting magnet accelerator systems. This paper describes some of the design and construction features of powered internal trim coils and a sampling of the test results obtained.
Date:
January 1, 1986
Creator:
Thompson, P.A.; Cottingham, J.; Dahl, P.; Fernow, R.; Garber, M.; Ghosh, A. et al.
Object Type:
Article
System:
The UNT Digital Library
Active layer hydrology for Imnavait Creek, Toolik, Alaska
In the annual hydrologic cycle, snowmelt is the most significant event at Imnavait Creek located near Toolik Lake, Alaska. Precipitation that has accumulated for more than 6 months on the surface melts in a relatively short period of 7 to 10 days once sustained melting occurs. During the ablation period, runoff dominates the hydrologic cycle. Some meltwater goes to rewetting the organic soils in the active layer. The remainder is lost primarily because of evaporation, since transpiration is not a very active process at this time. Following the snowmelt period, evapotranspiration becomes the dominate process, with base flow contributing the other watershed losses. It is important to note that the water initally lost by evapotranspiration entered the organic layer during melt. This water from the snowpack ensures that each year the various plant communities will have sufficient water to start a new summer of growth.
Date:
January 1, 1986
Creator:
Kane, D.L.
Object Type:
Report
System:
The UNT Digital Library
Additional measurements of the radiation environment at the Los Alamos Spallation Radiation Effects Facility at LAMPF
Foil activation dosimetry experiments were conducted in a ''rabbit'' system at the completed Los Alamos Spallation Radiation Effects Facility (LASREF). The ''raffit'' system contains four tubes spaced radially outward 0.12, 0.18, 0.27, and 0.38 meters off beam centerline. Foils were irradiated for 3 to 62 hours to measure the neutron flux and energy spectrum radially from beam centerline, along the beamline, and the effect of the Isotope Production (IP) target loadings on the neutron flux in the neutron irradiation locations. Irradiations showed a decrease in the radial flux by a factor of 6 in 0.15 meters of iron outside the IP targets. An enchancement was seen in the 24-keV energy region outside 0.15 meters. There was little difference in the shape of the spectra outside the IP targets and the beam stop with the exception of the high energy tail (energies above 20 MeV). The decrease in the high energy tail outside the beam stop is due to the degradation of the energy of the proton beam in the IP targets. Irradiations outside the beam stop with zero and eight IP targets gave the same spectral shape with the exception of the high energy tail. The magnitude of the integral …
Date:
January 1, 1986
Creator:
Davidson, D. R.; Reedy, R. C.; Greenwood, L. R.; Sommer, W. F. & Wechsler, M. S.
Object Type:
Article
System:
The UNT Digital Library
Additional short-term plutonium urinary excretion data from the 1945-1947 plutonium injection studies
The amount of plutonium excreted per day following intravenous injection was shown to be significantly higher than predicted by the Langham power function model. Each of the Los Alamos National Laboratory notebooks used to record the original analytical data was studied for details that could influence the findings. It was discovered there were additional urine excretion data for case HP-3. This report presents the additional data, as well as data on case HP-6. (ACR)
Date:
January 1, 1986
Creator:
Moss, W.D. & Gautier, M.A.
Object Type:
Article
System:
The UNT Digital Library
Advanced accelerator research at Argonne
A facility with which to experimentally measure methods of advanced acceleration is at the point of completion at Argonne National Laboratory. The new facility consists a system which produces pulse ''doublets'' of energetic electrons, pulse shaping hardware, a space for experimental apparatus, and a high resolution spectrometer. The leading 21 MeV pulse in a doublet can contain up to 15 nano-coulombs of charge and can be adjusted to be from 6 to over 100 pic-seconds in length. The trailing doublet pulse is at 15 MeV, contains about 10/sup 6/ electrons, and can be precisely positioned behind the first from 0 to more than 2000 pico-seconds. This second pulse serves as a probe of fields produced by the intense leading pulse. The initial experimental program includes studies of wake field effects in structures and in plasma. The high resolution of the spectrometer will also make possible measurements of the wakes of various components such as bellows, beam signal pickups, and vacuum connections. Commissioning of the facility is to begin in September, 1986. Tests using cavities and plasma are expected to begin soon thereafter.
Date:
January 1, 1986
Creator:
Konecny, R.; MacLachlan, J.; Norem, J.; Ruggiero, A.; Schoessow, P. & Simpson, J.
Object Type:
Article
System:
The UNT Digital Library
Advanced remote handling for future applications: The advanced integrated maintenance system
The Consolidated Fuel Reprocessing Program at Oak Ridge National Laboratory has been developing advanced techniques for remote maintenance of future US fuel reprocessing plants. The developed technology has a wide spectrum of application for other hazardous environments. These efforts are based on the application of teleoperated, force-reflecting servomanipulators for dexterous remote handling with television viewing for large-volume hazardous applications. These developments fully address the nonrepetitive nature of remote maintenance in the unstructured environments encountered in fuel reprocessing. This paper covers the primary emphasis in the present program; the design, fabrication, installation, and operation of a prototype remote handling system for reprocessing applications, the Advanced Integrated Maintenance System.
Date:
January 1, 1986
Creator:
Herndon, J.N.; Kring, C.T. & Rowe, J.C.
Object Type:
Article
System:
The UNT Digital Library
Advances in high-resolution studies of the chemical effects in the molybdenum L heavy-ion-induced x-ray satellite emission (HIXSE) spectra
High-resolution measurements of the molybdenum L heavy-ion-induced x-ray satellite emission (HIXSE) spectra of a series of Mo alloys and compounds have been obtained with a new, high-efficiency, high-resolution Bragg crystal spectrometer in the von Hamos geometry. The improved resolution (5 eV at 2.3 keV) is sufficient to reveal the L/sup n/M/sup m/ configuration lines in the L..cap alpha.. and L..beta.. hypersatellite bands. Both sets of lines exhibit the same trend in the variation of the relative yield distribution with the chemical environment as was observed for KL/sup n/ lines of lower Z targets. Difference spectra, using elemental molybdenum as a subtrahend, enhance the systematic variation. These results confirm the analysis and conclusions of lower resolution studies. They also indicate a potential for even greater sensitivity to the chemical environment.
Date:
January 1, 1986
Creator:
Rosseel, T. M.; Dale, J. M.; Hulett, L. D.; Pepmiller, P. L.; Vane, C. R.; Walkiewicz, T. A. et al.
Object Type:
Article
System:
The UNT Digital Library
Los Alamos Controlled Air Incinerator for hazardous chemical and mixed radioactive wastes
The Los Alamos Controlled Air Incinerator (CAI) is currently the only radioactive waste incineration facility in the US permitted to treat polychlorinated biphenyls (PCBs). The CAI was developed in the mid-1970's as a demonstration system for volume reduction of transuranic (TRU) contaminated combustible solid wastes. It has since undergone additions and modifications to accommodate hazardous chemical wastes in response to a need within the Department of Energy (DOE) to treat mixed radioactive/chemical wastes. An overview of these additions which include a liquid feed system, a high intensity liquid injection burner, and an activated carbon adsorption unit is presented here. Also included is a discussion of the procedures required for Toxic Substances Control Act (TSCA) and Resource Conservation and Recovery Act (RCRA) permitting of the CAI.
Date:
January 1, 1986
Creator:
Vavruska, J. S.; Borduin, L. C.; Hutchins, D. A.; Koenig, R. A. & Warner, C. L.
Object Type:
Article
System:
The UNT Digital Library