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A TRANSISTORIZED ALPHA COUNTER FOR AN ALPHA GAUGE

Description: A transistorized instrument prototype was designed and constructed to replace a vacuum-tube instrument in an alpha gauge, which measures the thickness density of gases. The instrument amplifies, shapes, discriminates, and counts alpha pulses from a Au-Si surface-barrier detector exposed to an alpha source in a gas-filled chamber. The circuit consists of a charge-sensitive preamplifier, a main amplifier with pulse clipping, a Schmitt trigger, a diode pump, and a count rate meter. Preliminary tes… more
Date: August 23, 1962
Creator: Kopp, M.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Engineering problems of future neutral beam injectors

Description: Because there is no limit to the energy or power that can be delivered by a neutral-beam injector, its use will be restricted by either its cost, size, or reliability. Studies show that these factors can be improved by the injector design, and several examples, taken from mirror reactor studies, are given.
Date: November 23, 1977
Creator: Fink, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nuclear design of fast hybrid blankets

Description: The objective of this presentation is to: (1) present the physical motivation for fusion-fission hybrids, (2) outline design considerations for hybrid blankets, and (3) discuss the nuclear performance potential of hybrid blankets.
Date: January 23, 1978
Creator: Lee, J. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Evaluation of Effectiveness of the Turco Low Profile Turbulator Reg Sign

Description: This document discusses a turbulator which utilizes a heated chemical bath to reduce smearable contamination from small parts and tools. It is comprised of two agitators programmed to automatically alternate the flow of the cleaning solution within the tank in four separate and distinct high velocity flow patterns allowing access to the entire surface area of the part or tool being decontaminated. The turbulator is being evaluated to determine if agitation increases the effectiveness of waste m… more
Date: October 23, 1990
Creator: Grittmann, S.; McGlynn, J. F.; Long, J. R. & Rankin, W. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mechanical properties of high-current multifilamentary Nb/sub 3/Sn conductors

Description: Nb/sub 3/Sn is a strain-sensitive superconductor which exhibits large changes in properties for strains of less than 1 percent. The critical current density at 12 T undergoes a reversible degradation of a factor of two for compressive strains of about 1 percent and undergoes an irreversible degradation for tensile strains on the Nb/sub 3/Sn greater than 0.2 percent. Consequently, the successful application of Nb/sub 3/Sn in large high-field magnets requires a complete understanding of the mecha… more
Date: May 23, 1980
Creator: Scanlan, R. M.; Hoard, R. W.; Cornish, D. N. & Zbasnik, J. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Modeling of Fission Gas Release in UO2

Description: A two-stage gas release model was examined to determine if it could provide a physically realistic and accurate model for fission gas release under Prometheus conditions. The single-stage Booth model [1], which is often used to calculate fission gas release, is considered to be oversimplified and not representative of the mechanisms that occur during fission gas release. Two-stage gas release models require saturation at the grain boundaries before gas is release, leading to a time delay in rel… more
Date: January 23, 2006
Creator: Krohn, MH
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

AN OVERVIEW OF THE SNS ACCELERATOR MECHANICAL ENGINEERING.

Description: The Spallation Neutron Source (SNS*) is an accelerator-based neutron source currently nearing completion at Oak Ridge National Laboratory. When completed in 2006, the SNS will provide a 1 GeV, 1.44 MW proton beam to a liquid mercury target for neutron production. SNS is a collaborative effort between six U.S. Department of Energy national laboratories and offered a unique opportunity for the mechanical engineers to work with their peers from across the country. This paper presents an overview o… more
Date: June 23, 2006
Creator: HSEUH, H.; LUDWIG, H.; MAHLER, G.; PAI, C.; PEARSON, C.; RANK, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Final optics damage inspection (FODI) for the National Ignition Facility

Description: The National Ignition Facility (NIF) at the Lawrence Livermore National Laboratory (LLNL) will routinely fire high energy shots (approaching 10 kJ per beamline) through the final optics, located on the target chamber. After a high fluence shot, exceeding 4J/cm2 at 351 nm wavelength, the final optics will be inspected for laser-induced damage. The FODI (Final Optics Damage Inspection) system has been developed for this purpose, with requirements to detect laser-induced damage initiation and to t… more
Date: October 23, 2007
Creator: Conder, A.; Alger, T.; Azevedo, S.; Chang, J.; Glenn, S.; Kegelmeyer, L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Simulations of dynamic crack propagation in brittle materials using nodal cohesive forces and continuum damage mechanics in the distinct element code LDEC

Description: Experimental data indicates that the limiting crack speed in brittle materials is less than the Rayleigh wave speed. One reason for this is that dynamic instabilities produce surface roughness and microcracks that branch from the main crack. These processes increase dissipation near the crack tip over a range of crack speeds. When the scale of observation (or mesh resolution) becomes much larger than the typical sizes of these features, effective-medium theories are required to predict the coar… more
Date: August 23, 2006
Creator: Block, G I; Rubin, M B; Morris, J P & Berryman, J G
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Electric gun: a new tool for ultrahigh-pressure research

Description: We have developed a new tool for ultrahigh-pressure research at LLL. This system, which we call the electric gun, has already achieved thin flyer plate velocities in excess of 20 km/s and pressures of the order of 2 TPa in tantalum. We believe that the electric gun is competitive with laser- and nuclear-driven methods of producing shocks in the 1-to-5 TPa range because of its precision and ease and economy of operation. Its development is recommended for shock initiation studies, dry runs for S… more
Date: April 23, 1979
Creator: Weingart, R. C.; Chau, H. H.; Goosman, D. R.; Hofer, W. W.; Honodel, C. A.; Lee, R. S. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Characterization of DC-S-2000 silicone rubber as an O-ring material for laser amplifier systems

Description: We evaluated mechanical, thermal, thermodynamic, and chemical properties of Dow Corning DC-S-2000, a silicone rubber filled with silica, that was selected as an O-ring material for SHIVA laser amplifiers. We compared the properties of a batch cured in-house with the manufacturer's specifications, and we developed specific quality-control tests to evaluate future production batches of this elastomer. We also examined mechanical and thermal transitions not described in the manufacturer's bulletin… more
Date: March 23, 1979
Creator: Hoffman, D.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Remote Engineering progress report, January-December 1984

Description: This report summarizes progress on work performed in the Remote Engineering group at Rocky Flats from January to December 1984. Remote Engineering's goals in all 1984 projects were to help increase production capacity, reduce radiation exposure, improve operation safety, improve product quality, or alleviate material-accounting errors. To convert manual operations to automated operations, Remote Engineering provided design, fabrication, and assembly of new equipment for varied plant operations.… more
Date: December 23, 1985
Creator: Phillips, D.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A review of the Model 5A uranium hexafluoride cylinder

Description: Both the Model 5A (Monel 400) and 5A (Monel 400) Modified five-inch cylinders have been used at the Portsmouth GDP to withdraw, store, and ship highly enriched uranium hexafluoride. As a result of a generic cracking problem with Monel 400 valve-boss material, a cylinder modification was implemented in the mid 1970s. This modification resulted in the violation of the ASME ''Code'' stamp status of the Model 5A Modified cylinder. Hydrostatic testing-to- rupture data indicated that the Model 5A Mod… more
Date: May 23, 1989
Creator: Dorning, R.E. II
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Measurement of critical temperature as a function of field

Description: The critical temperature has been measured for various magnet conductors as a function of the perpendicular applied magnetic field. The isothermal environment was provided by a variable temperature cryostat which fits into the bore of a 10.0 tesla solenoid. The temperature gradient across the sample volume was measured to be less than 25 millikelvins. The superconducting the normal state transition was measured resistively, using sample current densities from 0.01 to 2 A/cm/sup 2/. The maximum … more
Date: April 23, 1983
Creator: McInturff, A.D.; Ishibashi, K. & Heard, G.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Compatibility of refrigerants and lubricants with motor materials

Description: During this last quarter, evaluations were complete on the motor materials after 500-hr exposures to refrigerants CFC-123, HFC-134a and HCFC-22 at 90{degrees}C. Materials were also evaluated after exposure to nitrogen at 127{degrees}C to determine effect of the thermal exposure. Other exposures were started during this quarter with refrigerants HCFC-124, HFC-125, HFC-143a, HFC-32 and HFC-152a. One 500 hr exposure is set up per week and one is analyzed the same week. This will enable Trane to co… more
Date: July 23, 1992
Creator: Doerr, R. & Kujak, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Manufacture and evaluation of Nb/sub 3/Sn conductors fabricated by the MJR method

Description: The bronze matrix/niobium filament process has become established as a commercially viable method for producing multifilamentary Nb/sub 3/Sn superconductors. This paper describes a new method, the Modified Jelly-Roll (MJR) approach, which can produce a structure similar to that in a conventionally fabricated multifilamentary Nb/sub 3/Sn conductor. This approach utilizes alternate sheets of niobium expanded metal and bronze, which are rolled into a jelly-roll configuration and then extruded. Dur… more
Date: November 23, 1982
Creator: McDonald, W. K.; Curtis, C. W.; Scanlan, R. M.; Larbalestier, D. C.; Marken, K. & Smathers, D. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Electric filter with movable belt electrode

Description: A method and apparatus are disclosed for removing airborne contaminants entrained in a gas or airstream. The apparatus includes an electric filter characterized by a movable endless belt electrode, a grounded electrode, and a filter medium sandwiched therebetween. Inclusion of the movable, endless belt electrode provides the driving force for advancing the filter medium through the filter, and reduces frictional drag on the filter medium, thereby permitting a wide choice of filter medium materi… more
Date: February 23, 1982
Creator: Bergman, W.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Loading capacity of various filters for lithium fire generated aerosols

Description: The lithium aerosol loading capacity of a prefilter, HEPA filters and a sand and gravel bed filter was determined. The test aerosol was characterized and was generated by burning lithium in an unlimited air atmosphere. Correlation to sodium aerosol loading capacities were made to relate existing data to lithium aerosol loadings under varying conditions. This work is being conducted in support of the fusion reactor safety program. The lithium aerosol was generated by burning lithium pools, up to… more
Date: October 23, 1980
Creator: Jeppson, D.W. & Barreca, J.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Grooved impactor and inertial trap for sampling inhalable particulate matter. [Patents]

Description: An inertial trap and grooved impactor for providing a sharp cutoff for particles over 15 microns from entering an inhalable particulate sampler is disclosed. The impactor head has a tapered surface and is provided with V-shaped grooves. The tapered surface functions for reducing particle blow-off or reentrainment while the grooves prevent particle bounce. Water droplets and any resuspended material over the 15 micron size are collected by the inertial trap and deposited in a reservoir associate… more
Date: February 23, 1982
Creator: Loo, B.W.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Design and test of an exhaust-gas clean-up system for powerplants using high-sulphur-content fuels

Description: The progress to date for each major element of the program is graphed. A description of each program element is given. Completion of the data acquisition system has slipped due to a delay in delivery from Hewlett Packard. Part of the labor costs allocated for this includes time for personnel to become familiar with the equipment and to integrate the system with the test set-up. Completion of the test cell and the fuel system has slipped. This has turned out to be a significant undertaking and i… more
Date: January 23, 1979
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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