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Optical components for the Nova laser
In addition to its other characteristics, the Nova Laser Fusion facility may well be the largest precision optical project ever undertaken. Moreover, during the course of construction, concurrent research and development has been successfully conducted, and has resulted in significant advances in various technical areas, including manufacturing efficiency. Although assembly of the first two beams of Nova is just commencing, the optical production, including construction of the special facilities required for many of the components, has been underway for over three years, and many phases of the optical manufacturing program for the first 10 beams will be completed within the next two years. On the other hand, new requirements for second and third harmonic generation have created the need to initiate new research and development. This work has been accomplished through the enormous cooperation DOE/LLNL has received from commercial industry on this project. In many cases, industry, where much of the optical component research and development and virtually all of the manufacturing is being done, has made substantial investment of its own funds in facilities, equipment, and research and development, in addition to those supplied by DOE/LLNL.
Date:
May 17, 1982
Creator:
Wallerstein, E.P.; Baker, P.C. & Brown, N.J.
Object Type:
Article
System:
The UNT Digital Library
Laser neutralization
Laser photodetachment of the excess electron to neutralize relativistic ions offers many advantages over the more conventional collisional methods using gases or thin foils as the neutralization agents. Probably the two most important advantages of laser photodetachment are the generation of a compact and low divergence beam, and the production of intense neutral beams at very high efficiency (approximately 90%). The high intensities or high current densities of the neutral beam result from the fixed maximum divergence that can be added to the beam by photodetachment of the charge using laser intensity of fixed wavelength and incident angle. The high neutralization efficiency is possible because there is no theoretical maximum to the neutralization efficiency, although higher efficiencies require higher laser powers and, therefore, costs. Additional advantages include focusability of the laser light onto the ion beam to maximize its efficacy. There certainly is no residual gas left in the particle beam path as is typical with gas neutralizers. The photodetachment process leaves the neutral atoms in the ground state so there is no excited state fluorescence to interfere with the subsequent beam sensing. Finally, since the beams to be neutralized are very high powered, for a large range of neutralization …
Date:
June 17, 1986
Creator:
Peterson, O.G.
Object Type:
Report
System:
The UNT Digital Library
Advanced development of a pressurized ash agglomerating fluidized-bed coal gasification system. Fourth quarter progress report, July 1-September 30, 1982
The overall objective of the Westinghouse coal gasification program is to demonstrate the viability of the Westinghouse pressurized, fluidized bed, gasification system for the production of medium-Btu fuel gas for syngas, electrical power generation, chemical feedstocks, or industrial fuels and to obtain performance and scaleup data for the process and hardware. Technical progress summaries and reports are presented for the following tasks: (1) process development unit (PDU) test operations and results (gasifier test TP-033-1 and maintenance and modifications); (2) process analysis (environmental characterization results, coal gas combustion results, and fines elutriation and consumption results); (3) cold flow scaleup (modifications and maintenance, operations, and data analysis); (4) process and component engineering and design (hot fines recycle modifications, and hot recycled fines); (5) laboratory support studies (gas-solids flow modeling and coal/ash behavior). 23 figures, 23 tables.
Date:
February 17, 1983
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Plasma channel optical-pumping device and method
A device and method are described for optically pumping a gaseous laser using blackbody radiation produced by a plasma channel which is formed from an electrical discharge between two electrodes spaced at opposite longitudinal ends of the laser. A preionization device which can comprise a laser or electron beam accelerator produces a preionization beam which is sufficient to cause an elctrical discharge between the electrodes to initiate the plasma channel along the preionization path. The optical pumping energy is supplied by a high voltage power supply rather than by the preionization beam. High output optical intensities are produced by the laser due to the high temperature black-body radiation produced by the plasma channel, in the same manner as an exploding wire type laser. However, unlike the exploding wire type laser, the disclosed invention can be operated in a repetitive manner by utilizing a repetitive pulsed preionization device.
Date:
July 17, 1981
Creator:
Judd, O.P.
Object Type:
Patent
System:
The UNT Digital Library
Models for Type I supernovae
Two rather disjoint scenarios for Type I supernovae are presented. One is based upon mass accretion by a white dwarf in a binary system. The second involves a star having some 8 to 10 times the mass of the sun which may or may not be a solitary star. Despite the apparent dissimilarities in the models it may be that each occurs to some extent in nature for they both share the possibility of producing substantial quantities of /sup 56/Ni and explosions in stars devoid of hydrogen envelopes. These are believed to be two properties that must be shared by any viable Type I model.
Date:
June 17, 1980
Creator:
Woosley, S. E.; Weaver, T. A. & Taam, R. E.
Object Type:
Article
System:
The UNT Digital Library
A high-fluence fusion neutron source
A conceptual design of a D-T fusion facility for continuous production of 14-MeV neutron wall loading from 5 to 10 MW/m/sup 2/ at the plasma surface is presented. In this design, D-T neutrons are produced in a linear, two-component plasma formed by neutral beam irradiation of a fully ionized warm plasma target. The beam energy, which is deposited in the center, is transferred to the warm plasma mainly by electron drag and is conducted along the target plasma column to end regions where it is absorbed in neutral gas at high pressure. The target plasma is operated in a regime where electron thermal conduction along the column is the controlling energy-loss process. The loss rate is minimized by adjusting the diameter and length of the plasma column. A substantial gradient in T/sub e/ along the column results in recombination of the plasma to gas in the end-regions before impact on the end walls. The resultant hot gas is cooled by contact with large-area heat exchangers. In this way, the large steady-state heat load from the injected neutral beams is diffused and removed at tolerable heat flux levels. The reacting plasma is essentially an extrapolation of the 2XIIB high-..beta.. plasma to …
Date:
February 17, 1988
Creator:
Coensgen, F. H.; Casper, T. A.; Correll, D. L.; Damm, C. C.; Futch, A. H.; Logan, B. G. et al.
Object Type:
Article
System:
The UNT Digital Library
Separation and Characterization of Coal Derived Components. Quarterly Report, July 1-September 30, 1983
The field-ionization mass spectral hydrocarbon data from F-45 (Wyodak coal-derived SRC) and F-51 (Kentucky 9/14 coal-derived SRC) were recalculated so the various hydrocarbon fractions could be compared directly on a weight percent basis. A computer program was developed which allows the field-ionization mass spectral hydrocarbon data to be compared in a three dimensional fashion. This approach provides for a rapid general comparson of all the field-ionization hydrocarbon data. The solubility of preasphaltenes was tested in several solvents. The preasphaltenes-2 were found to be largely soluble in pyridine:chloroform 9:1(v/v) or 7:3(v/v) and pyridine:chloroform:tetrahydrofuran 7:1:2(v/v/v). Experiments were carried out in which Chromasorb T was tested as a replacement for Fluoropak in the Fluoropak-basic alumina procedure. The results indicated Chromasorb T would be an adequate substitute for Fluoropak, but additional experiments will be run to confirm this. The chromatographic characteristics of numerous hydroxyl aromatics, nitrogen heterocycles, and aromatic amines were obtained on several normal-phase and reversed-phase high-performance liquid chromatographic systems. 30 references, 30 figures, 10 tables.
Date:
October 17, 1983
Creator:
Hurtubise, R. J. & Silver, H. F.
Object Type:
Report
System:
The UNT Digital Library
Control of radioactive material transport in sodium-cooled reactors
The Radioactivity Control Technology (RCT) program was established by the Department of Energy to develop and demonstrate methods to control radionuclide transport to ex-core regions of sodium-cooled reactors. This radioactive material is contained within the reactor heat transport system with any release to the environment well below limits established by regulations. However, maintenance, repair, decontamination, and disposal operations potentially expose plant workers to radiation fields arising from radionuclides transported to primary system components. This paper deals with radioactive material generated and transported during steady-state operation, which remains after /sup 24/Na decay. Potential release of radioactivity during postulated accident conditions is not discussed. The control methods for radionuclide transport, with emphasis on new information obtained since the last Environmental Control Symposium, are described. Development of control methods is an achievable goal.
Date:
March 17, 1980
Creator:
Brehm, W. F.
Object Type:
Article
System:
The UNT Digital Library
Control system for a wound-rotor motor
A load switching circuit for switching two or more transformer taps under load carrying conditions includes first and second parallel connected bridge rectifier circuits which control the selective connection of a direct current load to taps of a transformer. The first bridge circuit is normally conducting so that the load is connected to a first tap through the first bridge circuit. To transfer the load to the second tap, a switch is operable to connect the second bridge circuit to a second tap, and when the second bridge circuit begins to conduct, the first bridge circuit ceases conduction because the potential at the second tap is higher than the potential at the first tap, and the load is thus connected to the second tap through the second bridge circuit. The load switching circuit is applicable in a motor speed controller for a wound-rotor motor for effecting tap switching as a function of motor speed while providing a stepless motor speed control characteristics.
Date:
July 17, 1981
Creator:
Ellis, James N.
Object Type:
Patent
System:
The UNT Digital Library
''Follow that quarkexclamation'' (and other exclusive stories)
Quarks are considered to be the basic constituents of matter. In a series of recent experiments, Carroll studied exclusive reactions as a means of determining the interactions between quarks. Quantum Chromo-dynamics (QCD) is the modern theory of the interaction of quarks. This theory explains how quarks are held together via the strong interaction in particles known as hadrons. Hadrons consisting of three quarks are called baryons. Hadrons made up of a quark and an antiquark are called mesons. In his lecture, Carroll describes what happens when two hadrons collide and scatter to large angles. The violence of the collision causes the gluons that bind the quarks in a particular hadron to temporarily lose their grip on particular quarks. Quarks scramble toward renewed unity with other quarks, and they undergo rearrangement, which generally results in additional new particles. A two-body exclusive reaction has occurred when the same number of particles exist before and after the collisions. At large angles these exclusive reactions are very rare. The labels on the quarks known as flavor enable the experimenter to follow the history of individual quarks in detail during these exclusive reactions. Carroll describes the equipment used in the experiment to measure short distance, …
Date:
June 17, 1987
Creator:
Carroll, A. S.
Object Type:
Report
System:
The UNT Digital Library
Rescaling of equipotential smoothing
A method is described for locally rescaling the curvilinear coordinates used in continuous rezoning of Lagrangian meshes by the equipotential method. In this way the zone aspect ratio may be brought closer to unity.
Date:
August 17, 1982
Creator:
Winslow, A. M. & Barton, R. T.
Object Type:
Report
System:
The UNT Digital Library
Continuous chain bit with downhole cycling capability
A continuous chain bit for hard rock drilling is disclosed which is capable of downhole cycling. A drill head assembly moves axially relative to a support body while the chain on the head assembly is held in position so that the bodily movement of the chain cycles the chain to present new composite links for drilling. A pair of spring fingers on opposite sides of the chain hold the chain against movement. The chain is held in tension by a spring-biased tensioning bar. A head at the working end of the chain supports the working links. The chain is centered by a reversing pawl and piston actuated by the pressure of the drilling mud. Detent pins lock the head assembly with respect to the support body and are also operated by the drilling mud pressure. A restricted nozzle with a divergent outlet sprays drilling mud into the cavity to remove debris. Indication of the centered position of the chain is provided by noting a low pressure reading indicating proper alignment of drilling mud slots on the links with the corresponding feed branches.
Date:
March 17, 1981
Creator:
Ritter, D. F.; St. Clair, J. A. & Togami, H. K.
Object Type:
Patent
System:
The UNT Digital Library
[Letter from James R. Miller to Richard Swain, February 17, 1987]
Letter from James R. Miller to Richard Swain, on February 17, 1987, sending him an executive summary and proposal for the Texas Academy of Mathematics and Science. An executive summary is included.
Date:
February 17, 1987
Creator:
Miller, James R.
Object Type:
Letter
System:
The UNT Digital Library
[Memo from Frank Kemerer, June 17, 1987]
Memo from Frank Kemerer to Julia Dunn, Barbara Jungjohan, Peter Lane, Betsy McGuire, Bruce Meeks, and Byron Medler, on June 17, 1987, extending an invitation from Dr. Jean Schaake to meet with the director of the Louisiana School for Math, Science and the Arts.
Date:
June 17, 1987
Creator:
Kemerer, Frank R.
Object Type:
Letter
System:
The UNT Digital Library
[Memorandum from Jean Schaake, July 17, 1987]
Memorandum from Jean Schaake to Alan Moore, John Ed Allen, Gerry O'Donovan, Rogers Redding, Walter Sandefur, Bob Stevens, Le Theriot, Blake Dehart, and Ron Arrington, advising them to leave September 15, 1987 open on their calendars, as they are expecting a visit from Julian C. Stanley.
Date:
July 17, 1987
Creator:
Schaake, Jean
Object Type:
Letter
System:
The UNT Digital Library
[Letter from James R. Miller to Alfred Hurley, February 18, 1987]
Letter from James R. Miller to Alfred Hurley, on February 18, 1987, confirming that he has sent a copy of the Academy proposal to Commission Ken Ashworth. He suggests that certain people be sent a copy of the proposal, and recommends that a news conference be held to announce the idea.
Date:
February 17, 1987
Creator:
Miller, James R.
Object Type:
Letter
System:
The UNT Digital Library
[Clipping: Club offers latest drugs for AIDS]
Continuation of an article from The Dallas Morning News discussing alternative treatments used by AIDS and HIV-positive patients supplied by the Dallas Buyer's Club. It includes a photograph of Ron Woodroof, the founder of the Dallas Buyer's Club, posing with a selection of pills and bottles. Portions of several other articles are on the back of the clipping.
Date:
May 17, 1989
Creator:
unknown
Object Type:
Clipping
System:
The UNT Digital Library
Early Admission to College for Bright Students
Article discussing the early admission to college programs, including the Texas Academy of Mathematics and Science.
Date:
May 17, 1989
Creator:
Cromer, Alan
Object Type:
Article
System:
The UNT Digital Library
Neutron yield measurements on a TMX endplug
Neutron yield measurements were made on the east endplug of TMX using a calibrated recoil proton counter. The detector consists of a liquid scintillator (NE 213) with a pulse shape discrimination property that allows for identifying photon and neutron interactions. An energy threshold is established to suppress the response to scattered neutrons with energies lower than 1 to 2 MeV. Results indicate there are typical neutron yields of 2 to 3 x 10/sup 11/ n/s during a 25-ms discharge with 200 A of 20-keV neutral beam injection into the endplug.
Date:
March 17, 1980
Creator:
Slaughter, D.R.
Object Type:
Report
System:
The UNT Digital Library
Environmental impacts of proposed Monitored Retrievable Storage
This report describes environmental impacts from a proposed monitored retrievable storage facility for spent fuels to be located in Tennessee. Areas investigated include: water supply, ground water, air quality, solid waste management, and health hazards. (CBS)
Date:
December 17, 1985
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Application of microwave energy for in-drum solidification of simulated precipitation sludge
The application of microwave energy for in-container solidification of simulated transuranic contaminated precipitation sludges has been tested. Results indicate volume reductions to 83% are achievable by the continuous feeding of pre-dried sludge into a waste container while applying microwave energy. An economic evaluation was completed showing achievable volume and weight reductions to 87% compared with a current immobilization process for wet sludge. 7 refs., 15 figs., 16 tabs.
Date:
August 17, 1987
Creator:
Petersen, R. D.; Johnson, A. J.; Swanson, S. D. & Thomas, R. L. (ed.)
Object Type:
Report
System:
The UNT Digital Library
Monopole strength as a probe of nuclear shape mixing
The monopole strength, MS, within a single set of nuclear shape excitations is compared with the MS between different shapes. After misconceptions are pointed out concerning the spin dependence of B(E2) values, MS properties are juxtaposed with gamma-ray and beta-decay properties of /sup 70/Se, /sup 96/Zr, /sup 102/Pd, and the N = 60 isotones to illustrate the utility of combined investigations and evidence is given for the observation of a two-phonon octupole multiplet. Finally, consideration is given to the dominance of the /sup 3/S/sub 1/ force in producing deformation in the N > 50 1g nuclei. 23 refs., 4 figs.
Date:
August 17, 1987
Creator:
Meyer, R.A.
Object Type:
Article
System:
The UNT Digital Library
Hadronic production of J/sup PC/ = 2/sup + +/ glueballs
An OZI suppressed channel with variable mass, namely the reaction ..pi../sup -/p ..-->.. phi phi n, has been used as a filter which allows resonating gluons or glueballs to pass, while strongly rejecting conventional quark-built hadronic states. The breakdown of the OZI suppression signals a glueball. Glueball mass and particle width estimates are discussed. Reasons why g/sub T/'s have not been seen in other channels, particularly the decay of J/psi, are considered. 34 refs., 9 figs. (LEW)
Date:
March 17, 1986
Creator:
Lindenbaum, S. J.
Object Type:
Article
System:
The UNT Digital Library
Potential benefits of R and D directed toward increasing the cost-effectiveness of energy use
The need for energy research programs directed toward increasing the cost-effectiveness of energy use is discussed. Benefits reaped by society as a consequence of successful completion of a research activity are economic, environmental, health and safety, security, and long term; emphasis is placed on the economic benefits from research projects on the demand side (i.e., energy end-use sectors). Each end-use sector was examined and data on the amount of energy consumed and the estimated cost of that energy are compiled.
Date:
March 17, 1982
Creator:
Anderson, T.D.
Object Type:
Report
System:
The UNT Digital Library