Access

Resource Type

Partner

Collection

Serial/Series Title

Country

States

Counties

Year

Month

Day

Language

442 Matching Results

Start Over Access Open Access Year 1977 Day 4th Language English

Results open in a new window/tab.

Results: 1 - 24 of 442 next

(open access)

Light Absorption and Scattering Mechanisms in Laser Fusion Plasmas

The picture of laser light absorption and scattering which is emerging from theory and computer simulation studies of laser-plasma interactions is described. On the subject of absorption, we discuss theoretical and experimental evidence that resonance absorption in a steepened density profile is a dominant absorption mechanism. Recent work also indicates the presence of critical surface ripples, which we study using two and three dimensional computer simulations. Predictions of hot electron spectra due to resonance absorption are described, as are effects of plasma outflow. We then discuss two regimes where stimulated scattering may occur. Brillouin scattering is expected in the underdense target blow-off, for long laser pulses, and is limited by ion heating. Raman scattering in the background gas of a reactor target chamber is predicted to be at most a 10 percent effect for 1 ..mu..m lasers.

Date: October 4, 1977

Creator: Barnes, C.; Estabrook, K. G.; Kruer, W. L.; Langdon, A. B.; Lasinski, B. F.; Max, C. E. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Exploding pusher performance at fixed laser power, a theoretical model

A model for the physics of exploding pusher targets is presented which compares favorably with the predictions of the complex simulation code, LASNEX.

Date: October 4, 1977

Creator: Rosen, M.D. & Nuckolls, J.H.

Object Type: Article

System: The UNT Digital Library

(open access)

Report of Group II-2: Running at ISA

A discussion is given of the anticipated operating conditions at the ISABELLE storage rings. Communications between experimental and control areas are considered, and beam luminosity monitoring is discussed. Running conditions and expected problems are outlined. (PMA)

Date: August 4, 1977

Creator: Chen, M.; Herrera, J. C.; Littenberg, L.; Thorndike, A.; Ogren, H.; Potter, K. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Simple scaling model for exploding pusher targets

A simple model has been developed which when normalized by experiment or Lasnex calculations can be used to scale neutron yields for variations in laser input power and pulse length and target radius and wall thickness. The model also illucidates some of the physical processes occurring in this regime of laser fusion experiments. Within certain limitations on incident intensity and target geometry, the model scales with experiments and calculations to within a factor of two over six decades in neutron yield.

Date: November 4, 1977

Creator: Storm, E. K.; Larsen, J. T.; Nuckolls, J. H.; Ahlstrom, H. G. & Manes, K. R.

Object Type: Article

System: The UNT Digital Library

(open access)

Assessment of a small pressurized water reactor for industrial energy

An evaluation of several recent ERDA/ORNL sponsored studies on the application of a small, 365 MW(t) pressurized water reactor for industrial energy is presented. Preliminary studies have investigated technical and reliability requirements; costs for nuclear and fossil based steam were compared, including consideration of economic inflation and financing methods. For base-load industrial steam production, small reactors appear economically attractive relative to coal fired boilers that use coal priced at $30/ton.

Date: October 4, 1977

Creator: Klepper, O. H.; Fuller, L. C. & Myers, M. L.

Object Type: Report

System: The UNT Digital Library

(open access)

Potassium vapor topping cycle. Technical progress report, April 1--June 30, 1977

The potassium vapor topping cycle is a concept for increasing the efficiency of the Rankine vapor cycle by raising the peak temperature by employing a potassium vapor cycle with a turbine inlet temperature of 1500 to 1600/sup 0/F (815 to 870/sup 0/C) in which the waste heat rejected from the condensing potassium vapor is transferred to boiling water and steam in a conventional steam cycle. An efficiency of about 50% is calculated for this cycle with a natural circulation potassium boiler fired by gas or oil. An Energy Research and Development Administration (ERDA) program is under way at Oak Ridge National Laboratory (ORNL) to build a full-scale potassium boiler tube bundle and burner module and test it with water and then potassium. Progress in this program is reported. The design work necessary for the installation of the potassium system was completed during the quarter. Fabrication of the potassium system components was finished. Installation of the condenser enclosure was completed and the drain tank was installed. Construction work on the equipment tower was completed.

Date: October 4, 1977

Creator: Holcomb, R. S.

Object Type: Report

System: The UNT Digital Library

(open access)

Review of FFTF and CRBRP control rod systems designs

The evolution of the primary control rod system design for FFTF and CRBR, beginning with the initial choice of the basic concepts, is described. The significant component and systems tests are reviewed together with the test results which referenced the development of the CRBR primary control rod system design. Modifications to the concepts and detail designs of the FFTF control rod system were required principally to satisfy the requirements of CRBR, and at the same time incorporating design refinements shown desirable by the tests.

Date: October 4, 1977

Creator: Pitterle, T. A. & Lagally, H. O.

Object Type: Report

System: The UNT Digital Library

(open access)

Evaluation of regional effects of effluents from uranium production in New Mexico

The Grants Uranium Region is a 2500 mile area of northcentral New Mexico which has produced about 40 percent of all domestic uranium, and holds over one-half of the current reserves. The increasing demand for uranium to fuel commercial nuclear power plants is resulting in rapid growth of the uranium industry and economic, social, and environmental changes are occurring. One of the environmental issues of this region is the concern for eventually unacceptable levels of air and water pollution from effluents from uranium mill tailings piles. This study addresses these potential impacts in relation to industrial environmental control practices, siting features, and other regional/temporal variables, including rates of production, locations and sizes of new mills, and population distributions.

Date: October 4, 1977

Creator: Wilson, D.W.

Object Type: Report

System: The UNT Digital Library

(open access)

Vacuum system for the Tandem Mirror Experiment

The Tandem Mirror Experiment (TMX) under construction at LLL is a Q-enhancement experiment using two mirror fields to ''plug'' a central solenoid field. Neutral beam injection supplies the energetic neutrals to the plug regions with attendant quantities of cold gas. The vacuum vessel consists of two large stainless steel tanks, which house the plug coils, joined by an aluminum central cell tank, which fits inside the existing solenoid coils from the 2XIIB experiment. The plug tanks are subdivided into regions for differential pumping of the source gas by liquid-nitrogen- or water-cooled liners. The liners are gettered by Ti--Ta wire sublimators of the 2XIIB type, using 2XIIB power supplies, to supply the necessary high-speed surface pumping. The roughing vacuum system consists of mercury vapor diffusion pumps backed by Roots-type blowers.

Date: October 4, 1977

Creator: Atkinson, D.P.; Calderon, M.O. & Nagel, R.J.

Object Type: Article

System: The UNT Digital Library

$Pressure vessel fracture studies pertaining to a PWR LOCA-ECC thermal shock: experiments TSE-3 and TSE-4 and update of TSE-1 and TSE-2 analysis$ (open access)

Pressure vessel fracture studies pertaining to a PWR LOCA-ECC thermal shock: experiments TSE-3 and TSE-4 and update of TSE-1 and TSE-2 analysis

The LOCA-ECC Thermal Shock Program was established to investigate the potential for flaw propagation in pressurized-water reactor (PWR) vessels during injection of emergency core coolant following a loss-of-coolant accident. Studies thus far have included fracture mechanics analyses of typical PWRs, the design and construction of a thermal shock test facility, determination of material properties for test specimens, and four thermal shock experiments with 0.53-m-OD (21-in.) by 0.15-m-wall (6-in.) cylindrical test specimens. In the first experiment, initiation was not expected and did not occur, although there was a small amount of subcritical crack growth. In the second experiment, initiation of a semicircular flaw took place as expected; the final length along the surface was about four times the initial length, but there was no radial growth. The third and fourth experiments were similar, and the long axial flaw initiated in good agreement with predictions.

Date: November 4, 1977

Creator: Cheverton, R.D. & Bolt, S.E.

Object Type: Report

System: The UNT Digital Library

(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.

Object Type: Article

System: The UNT Digital Library

captions transcript

[News Clip: Water Bills]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Date: October 4, 1977, 6:00 p.m.

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Aging]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Date: October 4, 1977, 6:00 p.m.

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Absentee]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Date: November 4, 1977, 10:00 p.m.

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

(open access)

Stress analysis of cylindrical pressure vessels with closely spaced nozzles by the finite-element method. Volume 1. Stress analysis of vessels with two closely spaced nozzles under internal pressure. [BWR; PWR; MULT-NOZZLE code]

A finite-element computer program, MULT-NOZZLE, was developed for the stress analysis of cylindrical pressure vessels with two or three closely spaced reinforced nozzles. MULT-NOZZLE consists of two modules which may be operated independently. The first module, FEMG, automatically prepares a finite-element mesh including the nodal point coordinates, finite-element connectivities, mesh options, and boundary value specifications for input to the finite-element solution module SAP3M. SAP3M, which is a modified and improved version of the SAP3 computer program, computes the nodal point displacements and stress tensor components, and prints and/or stores the results for later postprocessing. The accuracy of the SAP3M module is demonstrated by comparison studies of two classical theory-of-elasticity problems: a simply supported beam and a thick-walled ring under internal pressure loading. A complete discussion of MULT-NOZZLE is presented in four volumes. Volume develops the finite-element idealization for pressure vessels with two idential radially attached closely spaced nozzles for internal pressure loading. The nozzles may be unreinforced or fully reinforced according to the rules of the ASME Boiler and Pressure Vessel Code and may be located in either a longitudinal or a transverse plane of the vessel. Validation of the program for analyzing this type of structure is demonstrated by …

Date: October 4, 1977

Creator: Tso, F. K. W.; Bryson, J. W.; Weed, R. A. & Moore, S. E.

Object Type: Report

System: The UNT Digital Library

(open access)

Scientific problems of fusion, solved and to be solved

A good comprehensive review of research progress and the present status of research on inertial confinement, tokamak device, and magnetic mirror technology is given. (MOW)

Date: November 4, 1977

Creator: Post, Richard F.

Object Type: Article

System: The UNT Digital Library

(open access)

Design of an eight-megawatt series regulator

An 8-MW, 100 percent duty cycle, hard tube series regulator used to control the accelerating voltage of a neutral beam source is described. The series tube is a developmental switch/regulator tube capable of holding off 200 kV passing 85 A, and dissipating 2 MW of anode power. The regulator has high-speed interrupt capability to minimize the power delivered to the load in the event of a load fault. Its design is such that it can be used to regulate both positive and negative accelerating voltages. All reference/control signals between the modulator and the control station use optical links to minimize noise interference and ground loop problems. In all cases of optical coupling, the loss of light is the worst-case condition, i.e., loss of light turns off the regulator. The fast interrupt is accomplished by rapid removal of the screen grid voltage from the series tube, and then driving the control grid into cutoff. After the control grid is in cutoff the screen is allowed to recover, and the regulator is then ready to switch back on. The regulator tube driver is a straightforward dc-coupled amplifier with a cathode follower output; dc isolation between various sections of the modulator is accomplished …

Date: October 4, 1977

Creator: DeVore, K.R.

Object Type: Article

System: The UNT Digital Library