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Approach to decision modeling for an ignition test reactor

Description: A comparison matrix decision model is applied to candidates for a D-T ignition tokamak (TNS), including assessment of semi-quantifiable or judgemental factors as well as quantitative ones. The results show that TNS is mission-sensitive with a choice implied between near-term achievability and reactor technology.
Date: September 30, 1977
Creator: Howland, H.R. & Varljen, T.C.
Partner: UNT Libraries Government Documents Department
open access

High resolution difference schemes for compressible gas dynamics

Description: The advantages and disadvantages of four new high-resolution difference schemes, namely the von Neumann-Richtmyer, Godunovs, MUSCL and Glimms, for mathematically representing physical conditions in compressible gas flows are compared. (LCL)
Date: July 30, 1980
Creator: Woodward, P. & Colella, P.
Partner: UNT Libraries Government Documents Department
open access

Future engineering needs of mirror fusion reactors

Description: Fusion research has matured during the last decade and significant insight into the future program needs has emerged. While some will properly note that the crystal ball is cloudy, it is equally important to note that the shape and outline of our course is discernable. In this short summary paper, I will draw upon the National Mirror Program Plan for mirror projects and on available design studies of these projects to put the specific needs of the mirror program in perspective.
Date: July 30, 1982
Creator: Thomassen, K.I.
Partner: UNT Libraries Government Documents Department
open access

Free-electron laser generation of VUV and x-ray radiation using a conditioned beam and ion-channel focusing

Description: The use of ion-focusing and a conditioned beam greatly enhances FEL gain in the VUV and Soft X-Ray range. The equations governing FEL amplification are derived and results of a linear analysis are noted. Numerical results, including 3D effects and having an order of magnitude improvement in gain, are presented for a 30 {Angstrom} example. 3 refs., 2 figs., 1 tab.
Date: August 30, 1991
Creator: Yu, Li-Hua (Brookhaven National Lab., Upton, NY (United States)); Sessler, A. & Whittum, D.H. (Lawrence Berkeley Lab., CA (United States))
Partner: UNT Libraries Government Documents Department
open access

Double-mode pulsation

Description: Double mode pulsation is a very pervasive phenomenon in stars all over the Hertzsprung-Russell diagram. In order of increasing radius, examples are: ZZ Ceti stars, the sun, the delta Scuti stars, RR Lyrae variables, the ..beta.. Cephei variables and those related to them, Cepheids, and maybe even the Mira stars. These many modes have been interpreted as both radial and nonradial modes, but in many cases the actual mode has not been clearly identified. Yellow giants seem to be the most simple pu… more
Date: July 30, 1982
Creator: Cox, A. N.
Partner: UNT Libraries Government Documents Department
open access

Engineering design solutions of flux swing with structural requirements for ohmic heating solenoids

Description: Here a more detailed publication is summarized which presents analytical methods with solutions that describe the structural behavior of ohmic heating solenoids to achieve a better understanding of the relationships between the functional variables that can provide the basis for recommended design improvements. The solutions relate the requirements imposed by structural integrity to the need for producing sufficient flux swing to initiate a plasma current in the tokamak fusion machine. A method… more
Date: September 30, 1977
Creator: Smith, R. A.
Partner: UNT Libraries Government Documents Department
open access

Determination of performance criteria for high-level solidified nuclear waste from the commercial nuclear fuel cycle: a probabilistic safety analysis

Description: To minimize the radiological risk from the operation of a waste management system for the safe disposal of high-level waste, performance characteristics of the solidified waste form must be specified. The minimum waste form characteristics that must be specified are the radionuclide volatilization fraction, airborne particulate dispersion fraction, and the aqueous dissolution characteristics. The results indicate that the pre-emplacement environs are more limiting in establishing the waste form… more
Date: March 30, 1978
Creator: Heckman, R.A.
Partner: UNT Libraries Government Documents Department
open access

CSU solar house I solar collector

Description: No Description Available.
Date: June 30, 1975
Creator: Ward, D.S.
Partner: UNT Libraries Government Documents Department
open access

Thermal design and analysis of superconductors for the toroidal field coils of TNS. [NbTi]

Description: The toroidal field coils in two of the four TNS field coil design options are superconducting. NbTi superconductors are used in the low field design option and Nb/sub 3/Sn superconductors are used in the high field design option. The preliminary conceptual design parameters of the coils and the superconductors have been developed. The selected coil shape is the pure tension D-configuration. The superconductors are the multifilamentary, cabled design and are cooled by forced flow supercritical h… more
Date: September 30, 1977
Creator: Lee, A. Y.
Partner: UNT Libraries Government Documents Department
open access

Tritium related safety considerations for mirror upgrades

Description: One of the primary objectives of the MFTF-B upgrades is to demonstrate the technology of tritium breeding in a reactor-like configuration. This requires use and processing of tritium, involving an inventory of several hundred grams at the plant. This paper reviews the results of a preliminary assessment of the radiation hazard associated with the handling of tritium. The radiation dose consequences due to tritium release from normal operation and due to postulated accidents on plant personnel a… more
Date: November 30, 1983
Creator: Ghose, S.K.
Partner: UNT Libraries Government Documents Department
open access

Spectra of matrix isolated metal atoms and clusters. [In rare gases]

Description: The matrix isolation spectra of all of the 40 presently known atomic metal species show strong matrix effects. The transition energies are increased, and the bands are broad and exhibit splitting of sublevels which are degenerate in the gas phase. Several models have been proposed for splitting of levels, but basic effects are not yet understood, and spectra cannot be predicted, yet it is possible to correlate gas phase and matrix in many of the systems. Selective production of diatomics and cl… more
Date: September 30, 1977
Creator: Meyer, B.
Partner: UNT Libraries Government Documents Department
open access

NOVA laser facility for inertial confinement fusion

Description: The NOVA laser consists of ten beams, capable of concentrating 100 to 150 kJ of energy (in 3 ns) and 100 to 150 TW of power (in 100 ps) on experimental targets by 1985. NOVA will also be capable of frequency converting the fundamental laser wavelength (1.05 ..mu..m) to its second (0.525 ..mu..m) or third (0.35 ..mu..m) harmonic. This additional capability (80 to 120 kJ at 0.525 ..mu..m, 40 to 70 kJ at 0.35 ..mu..m) was approved by the US Department of Energy (DOE) in April 1982. These shorter w… more
Date: November 30, 1983
Creator: Simmons, W.W.
Partner: UNT Libraries Government Documents Department
open access

Cancer risks and neutron RBE's from Hiroshima and Nagasaki

Description: The new radiation dose estimates for Hiroshima and Nagasaki are here combined with epidemiologic data from the A-bomb survivors and examined radiobiologically for compatability with other human and experimental data. The new doses show certain improvements over the original T65 doses. However, they suggest for chronic granulocytic leukemia, total malignancies, and chromosome aberrations, at neutron doses of 1 rad, RBEs in excess of 100, higher than expected from other findings. This and other i… more
Date: April 30, 1982
Creator: Dobson, R.L. & Straume, T.
Partner: UNT Libraries Government Documents Department
open access

Nuclear criticality information system

Description: The nuclear criticality safety program at LLNL began in the 1950's with a critical measurements program which produced benchmark data until the late 1960's. This same time period saw the rapid development of computer technology useful for both computer modeling of fissile systems and for computer-aided management and display of the computational benchmark data. Database management grew in importance as the amount of information increased and as experimental programs were terminated. Within the … more
Date: November 30, 1981
Creator: Koponen, B. L. & Hampel, V. E.
Partner: UNT Libraries Government Documents Department
open access

Investigation of the cryogenic mechanical properties of low thermal-expansion superalloys

Description: Four Fe-based superalloys, JBK-75, Incoloy 903, Incoloy 905, and Incoloy 909 were evaluated as tube materials for ICCS Nb/sub 3/Sn superconductors. Evaluation consisted of 4-K tensile and elastic-plastic fracture-toughness testing, and a microstructural characterization of unwelded and autogenously gas-tungsten-arc welded sheet given a simulated postweld processing treatment of 15% cold reduction by rolling followed by a Nb/sub 3/Sn-reaction heat treatment of 96 hours at 700/sup 0/C plus 48 hou… more
Date: July 30, 1985
Creator: Summers, L.T. & Dalder, E.N.C.
Partner: UNT Libraries Government Documents Department
open access

Stable propagation of an electron beam in gas

Description: Conditions for the stable propagation of a pinched electron beam in low pressure gas (p approximately 0.1 to 100 torr) are described. The observed window of good propagation around p approximately 2 torr air is interpreted as the quenching of the two-stream mode by sufficiently high plasma density and collision frequency, and the simultaneous suppression of the resistive hose mode by sufficiently rapid generation of electrical conductivity from breakdown ionization.
Date: September 30, 1977
Creator: Lee, E. P.; Chambers, F. W.; Lodestro, L. L. & Yu, S. S.
Partner: UNT Libraries Government Documents Department
open access

Compact Fusion Advanced Rankine (CFARII) power cycle---Operating regimes

Description: Performance (cost/kWe and efficiency) of generic Compact Fusion Advanced Rankine (CFARII) power conversion is investigated for various working fluids, operating temperatures and pressures, and thermal power levels. A general conclusion is that good CFARII performance is found for a remarkably broad range of materials, temperatures, pressures and power levels, which gives considerable flexibility to future design studies which may apply CFARII energy conversion to specific fusion energy sources … more
Date: September 30, 1991
Creator: Logan, B. G.
Partner: UNT Libraries Government Documents Department
open access

Poloidal field coil design for a fusion--fission breeder reactor

Description: The magnetic, structural, and thermal design of superconducting poloidal field coils for a tokamak fusion-fission breeder reactor are described. The design requirements and considerations, with the resulting parameters, are presented.
Date: September 30, 1977
Creator: Howland, H. R.; Kelly, J .L. & Chi, J. W. H.
Partner: UNT Libraries Government Documents Department
open access

An automated tool for evaluating compliance and providing assistance with building energy standards during design

Description: In an effort to encourage the maximum cost-effective level of energy efficiency in new building design, energy-efficiency standards have become more location-specific and performance-based. As a result, standards often provide more than one path for ensuring and demonstrating that a design complies, but at the cost of increased complexity. In addition, the burden of remedying a noncompliant design rests on the designers' knowledge and experience, with only general guidance provided by the stand… more
Date: April 30, 1992
Creator: Quadrel, R.W.; Brambley, M.R. & Stratton, R.C.
Partner: UNT Libraries Government Documents Department
open access

Impurity and gas throughput control for TNS

Description: A model of the interaction between an ignited plasma and a wall is utilized to study the impact of impurities and recycled fuel ions and helium ash on the burn time of the plasma. The model indicates that the impurity concentration, n/sub im/, grows exponentially toward a maximum value determined by the confinement time for impurities, tau/sub im/, the sputtering coefficient, S/sub i/, and the isolation coefficient, ..cap alpha... The time for n/sub im/ to reach a critical value and quench the … more
Date: September 30, 1977
Creator: Sucov, E. W.
Partner: UNT Libraries Government Documents Department
open access

Mirror Fusion Test Facility: an intermediate device to a mirror fusion reactor

Description: The Mirror Fusion Test Facility (MFTF-B) now under construction at Lawrence Livermore National Laboratory represents more than an order-of-magnitude step from earlier magnetic-mirror experiments toward a future mirror fusion reactor. In fact, when the device begins operating in 1986, the Lawson criteria of ntau = 10/sup 14/ cm/sup -3/.s will almost be achieved for D-T equivalent operation, thus signifying scientific breakeven. Major steps have been taken to develop MFTF-B technologies for tande… more
Date: March 30, 1983
Creator: Karpenko, V.N.
Partner: UNT Libraries Government Documents Department
open access

Optical pumping of hot phonons in GaAs

Description: Optical pumping of hot LO phonons in GaAs has been studied as a function of the excitation photon frequency. The experimental results are in good agreement with a model calculation which includes both inter- and intra-valley electron-phonon scatterings. The GAMMA-L and GAMMA-X intervalley electron-phonon interactions in GaAs have been estimated.
Date: June 30, 1982
Creator: Collins, C.L. & Yu, P.Y.
Partner: UNT Libraries Government Documents Department
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