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in subjects: "Spherical Configuration"

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Photophoresis and the scattering of electromagnetic radiation

Electron-microscope photographs of soot lend support to the picture in which a soot particle is modeled as a collection of chains of small carbon spheres. The soot particle itself is typically considerably larger than the small carbon spheres making up the chains. Thus the soot particles might have a size approx.0.1 - 1 ..mu..m while the small carbon spheres might have a size approx.0.03 ..mu..m in typical situations. Further, measurements of the density of soot yield values much less than that… more

Date: September 1, 1985

Creator: Ipser, J.R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Status of Oak Ridge National Laboratory fusion activities

This review covers the following research being carried out at ORNL: (1) confinement experiments such as ATF, EBT, and STX, (2) theory, (3) atomic physics, (4) shielding, (5) technology developments on superconducting magnets, pellet injection, rf plasma heating, and materials, and (6) fusion engineering design center. (MOW)

Date: January 1, 1985

Creator: Rosenthal, M.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Numerical analysis of laminar forced convection in a spherical annulus

Calculations of steady laminar incompressible fluid-flow and heat transfer in a spherical annulus are presented. Steady pressures, temperatures, velocities, and heat transfer coefficients are calculated for an insulated outer sphere and a 0/sup 0/C isothermal inner sphere with 50/sup 0/C heated water flowing in the annulus. The inner sphere radius is 13.97 cm, the outer sphere radius is 16.83 cm and the radius ratio is 1.2. The transient axisymmetric equations of heat, mass, and momentum conser… more

Date: July 21, 1980

Creator: Tuft, D.B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A standard test set for numerical approximations to the shallow water equations in spherical geometry

A suite of seven test cases is proposed for the evaluation of numerical methods intended for the solution of the shallow water equations in spherical geometry. The shallow water equations exhibit the major difficulties associated with the horizontal dynamical aspects of atmospheric modeling on the spherical earth. These cases are designed for use in the evaluation of numerical methods proposed for climate modeling and to identify the potential trade-offs which must always be made in numerical m… more

Date: August 1, 1991

Creator: Williamson, D.L.; Hack, J.J.; Jakob, R.; Swarztrauber, P.N. (National Center for Atmospheric Research, Boulder, CO (United States)) & Drake, J.B. (Oak Ridge National Lab., TN (United States))

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Magnetic shielding design analysis

Two passive magnetic-shielding-design approaches for static external fields are reviewed. The first approach uses the shielding solutions for spheres and cylinders while the second approach requires solving Maxwell's equations. Experimental data taken at LLNL are compared with the results from these shieldings-design methods, and improvements are recommended for the second method. Design considerations are discussed here along with the importance of material gaps in the shield.

Date: December 27, 1983

Creator: Kerns, J.A.; LaPaz, A.D. & Fabyan, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

High-velocity impact tests involving thin spherical shells of tantalum and 304 stainless steel

This experimental program generated data to improve computer-code modeling of impact phenomena. The improved computation technique will be used to design a fissile-material container able to withstand a 335 m/s impact. The program involved flyer-plate-impact tests using thin shells of annealed 304 stainless steel and annealed tantalum at impact velocities of 28 to 180 m/s. No active instrumentation was used in this study; instead, all data were derived from measurements of test specimens. Pre- … more

Date: August 26, 1977

Creator: Steffan, K. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Gorter-Mellink pulsed-source problem in cylindrical and spherical geometry

An exact solution to the Gorter-Mellink pulsed-source problem is known in plane geometry. According to this solution, the central temperature falls as t{sup {minus}3/2}, where t is the elapsed time after an instantaneous, plane pulse. No such exact solutions are known to the pulsed-source problem in cylindrical and spherical geometry. But in cylindrical geometry, it can be shown that if the initial condition is an instantaneous temperature rise {Delta}T inside a cylinder of radius R, the centra… more

Date: January 1, 1991

Creator: Dresner, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

SOLA-STAR: a one-dimensional ICED-ALE hydrodynamics program for spherically symmetric flows

This report describes a simple, general-purpose, and efficient algorithm for solving one-dimensional spherically symmetric, transient fluid-dynamics problems using a variation of the ICED-ALE technique. Included are the finite difference equations, three test problems that illustrate various capabilities of the program, and a complete code description, including a listing, sample data decks and output, a summary of important variable names, and hints for conversion to other operating systems.

Date: July 1, 1980

Creator: Cloutman, L.D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Automated laser fusion target production concept

A target production concept is described for the production of multilayered cryogenic spherical inertial confinement fusion targets. The facility is to deliver targets to the reactor chamber at rates up to 10 per second and at costs consistent with economic production of power.

Date: October 4, 1977

Creator: Hendricks, C.D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Soft-sphere model for liquid metals

A semi-empirical soft-sphere model of fluids is modified for application to the thermodynamic properties of liquid metals. Enthalpy, volume, and sound speed are computed as functions of temperature for 13 metals and compared with experimental data. Critical points and coexistence curves are also computed and compared with experimental data, where these have been measured. Strengths and weaknesses of the model are discussed.

Date: November 8, 1977

Creator: Young, D.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Spherical torus: an approach to compact fusion at low field. Initial ignition assessments

Initial assessments of ignition devices based on the spherical torus concept suggest that an ignition spherical torus (IST) can be highly cost-effective and exceptionally small in unit size. Assuming advanced methods of current drive and confinement and beta scalings with plasma current, a D-T IST with a toroidal field of 2 to 3 T is estimated to have a major radius ranging from 1 m to 1.6 m, and a fusion power less than 60 MW. For the nominal IST (at 2 T and 1.6 m), the direct cost of the nucl… more

Date: January 1, 1985

Creator: Peng, Y. K. M.; Strickler, D. J.; Borowski, S. K.; Hamilton, W. R.; Reid, R. L.; Haines, J. R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Elastic-wave radiation from spherical sources

The radiation of spherical compressional waves from a spherical cavity in an ideal elastic solid is treated. The equations for the radiation source and field are written in terms of the reduced-displacement potential. The source equation is studied in terms of characteristic frequencies, corresponding periods and wavelengths, and damping. The field equations for the stresses, strains, radial displacement, etc., are reviewed with regard to the transitions between the near and far fields. The nat… more

Date: December 7, 1979

Creator: Rodean, H.C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Compact DT fusion spherical tori at modest fields

A spherical torus is obtained by retaining only the indispensable components on the inboard side of a tokamak plasma, such as a cooled, normal conductor that carries current to produce a toroidal magnetic field. The resulting device features an exceptionally small aspect ratio (typically 2-to-1 elongation), and ramp-up and maintenance of the plasma current primarily by noninductive means. The tokamak plasma takes on the spherical shape with a modest hole through the center, suggesting the name … more

Date: January 1, 1985

Creator: Peng, Y. K. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Simple spherical ablative-implosion model

A simple model of the ablative implosion of a high-aspect-ratio (shell radius to shell thickness ratio) spherical shell is described. The model is similar in spirit to Rosenbluth's snowplow model. The scaling of the implosion time was determined in terms of the ablation pressure and the shell parameters such as diameter, wall thickness, and shell density, and compared these to complete hydrodynamic code calculations. The energy transfer efficiency from ablation pressure to shell implosion kinet… more

Date: June 23, 1980

Creator: Mayer, F. J.; Steele, J. T. & Larsen, J. T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Advanced tokamak reactors based on the spherical torus (ATR/ST). Preliminary design considerations

Preliminary design results relating to an advanced magnetic fusion reactor concept based on the high-beta, low-aspect-ratio, spherical-torus tokamak are summarized. The concept includes resistive (demountable) toroidal-field coils, magnetic-divertor impurity control, oscillating-field current drive, and a flowing liquid-metal breeding blanket. Results of parametric tradeoff studies, plasma engineering modeling, fusion-power-core mechanical design, neutronics analyses, and blanket thermalhydraul… more

Date: June 1, 1986

Creator: Miller, R. L.; Krakowski, R. A.; Bathke, C. G.; Copenhaver, C.; Schnurr, N. M.; Engelhardt, A. G. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

An ultra-high-vacuum multiple grating chamber and scan drive with improved grating change

We describe a new grating chamber and scan drive which has been designed, built, and tested by Physical Sciences Laboratory of the University of Wisconsin for the new high flux, high-resolution spectroscopy branch line of the TOK hybrid wiggler/undulator on the NSLS VUV ring. The chamber will contain spherical gratings to be used in the Spherical Grating Monochromator (SGM) configuration introduced by Chen and Sette. The grating chamber houses five 180 mm {times} 35 mm {times} 30 mm gratings ca… more

Date: January 1, 1989

Creator: Hulbert, S. L.; Holly, D. J.; Middleton, F. H. & Wallace, D. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Compact DT fusion spherical tori at modest field

A spherical torus is obtained by retaining only the indispensable components on the inboard side of a tokamak plasma. It features an exceptionally small aspect ratio (around 1.5), a naturally elongated, D-shaped plasma cross section (2 to 1 elongation), and ramp-up and maintenance of the plasma current primarily by advanced methods. It takes on the spherical shape with a modest hole through the center, suggesting the name.

Date: January 1, 1985

Creator: Peng, M.; Borowski, S. K.; Dalton, G. R.; Gorker, G. E.; Hamilton, W. R.; Kunselman, M. H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Initial assessments of ignition spherical torus

Initial assessments of ignition spherical tori suggest that they can be highly cost effective and exceptionally small in unit size. Assuming advanced methods of current drive to ramp up the plasma current (e.g., via lower hybrid wave at modest plasma densities and temperatures), the inductive solenoid can largely be eliminated. Given the uncertainties in plasma energy confinement times and the effects of strong paramagnetism on plasma pressure, and allowing for the possible use of high-strength… more

Date: December 1, 1985

Creator: Peng, Y. K. M.; Borowski, S. K.; Bussell, G. T.; Dalton, G. R.; Gorker, G. E.; Haines, J. R. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Integrated system for production of neutronics and photonics calculational constants. Volume 15, Part E. Data testing results for the LLL Evaluated Nuclear Data Library (ENDL-78)

The LLL Evaluated Nuclear Data Library (ENDL-78) was tested for validity by comparing calculated and experimental values of k/sub eff/ for 67 critical assemblies and emission neutron spectra for 22 spheres that were pulsed with 14-MeV neutrons. 22 figures, 5 tables.

Date: August 13, 1979

Creator: Howerton, Robert J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Time-resolved x-ray line emission studies of thermal transport in multiple beam uv-irradiated targets

Thermal transport in spherical targets irradiated with multiple, nanosecond duration laser beams, has been a topic of much discussion recently. Different inferences on the level of thermal flux inhibition have been drawn from plasma velocity and x-ray spectroscopic diagnostics. We present new measurements of thermal transport on spherical targets made through time-resolved x-ray spectroscopic measurements of the progress of the ablation surface through thin layers of material on the surface of … more

Date: January 1, 1984

Creator: Jaanimagi, P.A.; Henke, B.L.; Delettrez, J. & Richardson, M.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Instability localized at the inner surface of an imploding spherical shell

It is shown that in an imploding spherical shell the surface instabilities are of two different types. The first, which occurs at the outer surfaces, is the Rayleigh-Taylor instability. The second instability occurs at the inner surface. This latter instability is not as disruptive as R-T modes, but it has three basic properties which differ considerably from those of the R-T instability: (1) it is oscillatory at early times; (2) it grows faster in the long wavelength modes; (3) it depends on t… more

Date: January 1, 1983

Creator: Han, S.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

(Lift and drag forces on droplets and particles in wall-bounded shear flows: Annual technical progress report)

No Description Available.

Date: January 1, 1991

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

CVD techniques applied to energy problems

Some of the applications of chemical vapor deposition in energy related programs will be discussed, and coating parameters will be described. The coatings to be discussed were made at reduced pressures from the hydrogen reduction of metal fluorides, or metal silane and from the pyrolysis of metal carbonyls.

Date: January 1, 1981

Creator: McCreary, W.J. & Carroll, D.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Some new ideas for Tandem Mirror blankets

The Tandem Mirror Reactor, with its cylindrical central cell, has led to numerous blanket designs taking advantage of the simple geometry. Also many new applications for fusion neutrons are now being considered. To the pure fusion electricity producers and hybrids producing fissile fuel, we are adding studies of synthetic fuel producers and fission-suppressed hybrids. The three blanket concepts presented are new ideas and should be considered illustrative of the breadth of Livermore's applicati… more

Date: October 12, 1981

Creator: Neef, W.S. Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department