4,680 Matching Results

Search Results

Advanced search parameters have been applied.

in publisher: "Los Alamos Scientific Laboratory"

open access

Operating experience with a 100-keV, 100-mA H/sup -/ injector

According to beam dynamics calculations it should be possible to accelerate a high-perveance beam in a radio-frequency quadrupole (RFQ) accelerator with low emittance growth and nearly 100% capture efficiency. A 100-mA, 100-keV H/sup -/ ion injector with a 5-Hz, 1-ms duty factor was built for use with this accelerator, but the beam emittance at 100 keV was found to be two to four times the value previously determined at 20 keV. This emittance growth was traced to the 20-keV beam transport, wher… more

Date: January 1, 1983

Creator: Allison, P.W. & Sherman, J.D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Induced Compton-scattering effects in radiation-transport approximations

The method of characteristics is used to solve radiation transport problems with induced Compton scattering effects included. The methods used to date have only addressed problems in which either induced Compton scattering is ignored, or problems in which linear scattering is ignored. Also, problems which include both induced Compton scattering and spatial effects have not been considered previously. The introduction of induced scattering into the radiation transport equation results in a quadr… more

Date: February 1, 1982

Creator: Gibson, D.R. Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

User's manual for ONEDANT: a code package for one-dimensional, diffusion-accelerated, neutral-particle transport

ONEDANT is designed for the CDC-7600, but the program has been implemented and run on the IBM-370/190 and CRAY-I computers. ONEDANT solves the one-dimensional multigroup transport equation in plane, cylindrical, spherical, and two-angle plane geometries. Both regular and adjoint, inhomogeneous and homogeneous (k/sub eff/ and eigenvalue search) problems subject to vacuum, reflective, periodic, white, albedo, or inhomogeneous boundary flux conditions are solved. General anisotropic scattering is … more

Date: February 1, 1982

Creator: O'Dell, R. D.; Brinkley, F. W. Jr. & Marr, D. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Coal-powder characterization and thermal analysis

The laser, which produces extremely fast heating rates, initiates primary pyrolysis reactions that are effectively quenched after a pulse, thus minimizing secondary reactions. A continuous (cw) CO/sub 2/ laser has been used to pyrolyze crushed coal samples in a helium atmosphere. The unsieved coal used in the experiments is characterized to define an average particle diameter and the distribution of diameters. This statistical information is used in several finite element numerical models to pr… more

Date: January 1, 1982

Creator: Bennett, G. & Luther, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Design and operation of a low-level solid-waste disposal site at Los Alamos

Since the mid-1940's, approximately 185000 m/sup 3/ of low-level and transuranic radioactive solid waste, generated in operations at the Los Alamos National Laboratory, have been disposed of by on-site shallow land burial. Procedures and facilities have been designed and evaluated in the areas of waste acceptance, treatment and storage, disposal, traffic control, and support systems. The methodologies assuring the proper management and disposal of radioactive solid waste are summarized.

Date: January 1, 1982

Creator: Balo, K. A.; Wilson, N. E. & Warren, J. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Experiment to study the. beta. -decay of free atomic and molecular tritium. [For determining antineutrino mass]

An apparatus is described which will allow the measurement of the ..beta..-decay of free tritium atoms and molecules for determining antineutrino mass. It consists of an RF dissociator, a long cylindrical decay region open at both ends, a guide field, and a magnetic spectrometer.

Date: January 1, 1982

Creator: Robertson, R. G. H.; Bowles, T. J.; Maley, M.; Browne, J. C.; Burritt, T.; Toevs, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Hot-electron distribution function in high-Z materials

An analytic expression is obtained for the distribution of hot electrons as a function of distance into a cold material slab in which ..nu../sub E/ = ..gamma../sub E/v/sup -..cap alpha../ and ..nu..perpendicular to = ..gamma..v/sup -..beta../ are the assumed velocity dependences of the energy loss collision frequency and the scattering collision frequency and ..nu../sub E/ << ..nu..perpendicular to. For a time independent source, a time independent solution exists with a characteristic penetrat… more

Date: January 1, 1982

Creator: Lindman, E. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Improved efficiency in thermochemical hydrogen cycles through decreasing the use of solvent water. Consideration of the sulfur dioxide: iodine cycle

This paper considers the relationship between evaporation and efficiency and examines experimentally an adaptation of the sulfur dioxide-iodine cycle where little water needs to be evaporated or condensed.

Date: January 1, 1982

Creator: Mason, C.F.V. & Bowman, M.G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Inducible protective proteins: a potentially novel approach to chemotherapy

A number of toxic chemical and physical agents elicit the induction of a series of protein species, some of which react with the agents and render them non-toxic. A few of the induced species (e.g., metallothionein) are rich in thiol groups which might be expected to react with alkylating agents and render them non-toxic. If a safe means could be found for selectively enhancing the synthesis of alkylating agent-reactive species in normal but not tumor cells, such a procedure would have ramifica… more

Date: January 1, 1982

Creator: Tobey, R. A.; Enger, M. D.; Griffith, J. K. & Hildebrand, C. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Interaction of the plasma tail of comet Bradfield 1979L on 1980 February 6 with a possibly flare-generated solar-wind disturbance

Solar-wind plasma data from the ISEE-3 and Helios 2 spacecraft have been examined in order to explain a uniquely rapid 10/sup 0/ turning of the plasma tail of comet Bradfield 1979L on 1980 February 6. An earlier study conducted before the availability of in situ solar-wind data (Brandt et al., 1980) suggested that the tail position angle change occurred in response to a solar-wind velocity shear across which the polar component changed by approx. 50 km s/sup -1/. The present contribution confir… more

Date: 1982~

Creator: Niedner, M. B., Jr.; Brandt, J. C.; Zwickl, R. D. & Bame, S. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Recovery of gas from hydrate deposits using conventional production technology. [Salt-frac technique]

Methane hydrate gas could be a sizeable energy resource if methods can be devised to produce this gas economically. This paper examines two methods of producing gas from hydrate deposits by the injection of hot water or steam, and also examines the feasibility of hydraulic fracturing and pressure reduction as a hydrate gas production technique. A hydraulic fracturing technique suitable for hydrate reservoirs is also described.

Date: January 1, 1982

Creator: McGuire, P. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Role of water in energy development

One consequence of the recently increasing emphasis on energy development is public concern about the adequacy of ancillary natural resources, particularly water. This concern accompanies other water-related issues such as droughts, decling water tables, and increasing urbanization. But as the relatively new user on the water scene, energy attracts a major share of public attention. The physical availabiltiy of water and the role of economics in water demand by energy are reviewed. Also describ… more

Date: January 1, 1982

Creator: Abbey, D.; Roach, F. & Brown, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Two bismuth sulfate-sulfuric acid hybrid thermochemical hydrogen cycles. Some experimental work related to the cycles and their possible improvement. Outline of a proposed antimonyl sulfate cycle in which sulfur dioxide and oxygen are separately evolved

Thermochemical hydrogen production topics discussed include: equilibrium pressures in the decomposition of Bi/sub 2/(SO/sub 4/)/sub 3/ and ..cap alpha..-and ..beta..-Bi/sub 2/O(SO/sub 4/)/sub 2/; survey experiments on the thermal decomposition of Bi/sub 2/(SO/sub 4/)/sub 3/; hydrates sorption of H/sub 2/SO/sub 4/ solutions by the solids; and possible simplification of the SO/sub 3/-SO/sub 2/-O/sub 2/ separation problem with a sulfuric acid-antimonyl sulfate hybrid cycle.

Date: January 1, 1982

Creator: Jones, W.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Advanced-fuel reversed-field pinch reactor (RFPR)

The utilization of deuterium-based fuels offers the potential advantages of greater flexibility in blanket design, significantly reduced tritium inventory, potential reduction in radioactivity level, and utilization of an inexhaustible fuel supply. The conventional DT-fueled Reversed-Field Pinch Reactor (RFPR) designs are reviewed, and the recent extension of these devices to advanced-fuel (catalyzed-DD) operation is presented. Attractive and economically competitive DD/RFPR systems are identif… more

Date: October 1, 1981

Creator: Hagenson, Randy L. & Krakowski, Robert A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

All-metal vacuum chamber for the ZT-40 experiment

We discuss the design and fabrication of the all-metal vacuum chamber presently in use in the ZT-40 device. ZT-40 is the current experiment in the Los Alamos Reversed-Field Pinch (RFP) program. The new vessel, which replaces a ceramic one, is made of Inconel 625 and has major and minor diameters of 228 cm and 40 cm, respectively. It consists of 24 convoluted and straight sections welded into a single toroidal geometry. Presented are several design features showing diagnostic and vacuum port tub… more

Date: October 1, 1981

Creator: Dike, R. S. & Downing, J. N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Conceptual design studies of the Modular Stellarator Reactor (MSR)

A preliminary conceptual study has been made of the Modular Stellarator Reactor (MSR) as a steady-state, ignited, DT-fueled, magnetic fusion reactor. The MSR concept combines the physics of classic stellarator confinment with an innovative, modular-coil design. Parametric tradeoff calculations are described, leading to the selection of an interim design point for a 4.8-GWt plant based on Alcator transport scaling and an average beta value of 0.04 in an l = 2 system with a plasma aspect ratio of… more

Date: October 1, 1981

Creator: Miller, R. J. & Krakowski, R. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Tuning experience with the FMIT scale-model drift-tube linac

A scale model of the Fusion Materials Irradiation Test Facility (FMIT) 80-MHz drift-tube linac (DTL) was constructed to investigate the tuning procedure. The model DTL has 16 cells and was constructed to have the accelerating mode at 367 MHz. The mode spectrum was measured for various post penetrations, and field profiles of the modes were recorded. The field profiles were measured by using a beadpull apparatus, together with an automatic data-acquisition system. Tilt-sensitivity measurements w… more

Date: October 1, 1981

Creator: Earley, L. M.; Potter, J. M. & Thomas, A. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Publications of Los Alamos research 1980

This bibliography is a compilation of unclassified publications of work done at the Los Alamos National Laboratory for 1980. Papers published in 1980 are included regardless of when they were actually written. Publications received too late for inclusion in earlier compilations have also been listed. Declassification of previously classified reports is considered to constitute publication. All classified issuances are omitted-even those papers, themselves unclassified, which were published only… more

Date: September 1, 1981

Creator: Salazar, C. A. & Willis, J. K. (comps.)

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Structure of /sup 13/C studied by pion scattering near the (3,3) resonance

Good resolution (..pi../sup +/,..pi../sup +/') and (..pi../sup -/,..pi../sup -/') data were obtained for many states in /sup 13/C using the Energetic Pion Channel and Spectrometer at the Los Alamos Meson Physics Facility. Differential cross sections were measured for angles between 20/sup 0/ and 105/sup 0/ at an incident pion energy of 162 MeV for the elastic scattering as well as for states at excitation energies of 3.09, 3.68, 3.85, 7.55, 8.86, 9.5, 11.82, 16.05, 17.92, 21.37, and 21.6 MeV. E… more

Date: September 1, 1981

Creator: Seestrom-Morris, S.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Radiative transfer approximations in stellar pulsation theory

Pulsation theory is discussed in light of recent improvements in the theory of radiative transfer and hydrodynamics with applications to Cepheids, RR Lyrae, and W Virginis stars.

Date: August 1, 1981

Creator: Davis, C.G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Assessment of precision gamma scanning for inspecting LWR fuel rods. Final report

Reconstruction of the radial two-dimensional distributions of fission products using projections obtained by nondestructive gamma scanning was evaluated. The filtered backprojection algorithm provided the best reconstruction for simulated gamma-ray sources, as well as for actual irradiated fuel material. Both a low-burnup (11.5 GWd/tU) light-water reactor fuel rod and a high-burnup (179.1 GWd/tU) fast breeder reactor fuel rod were examined using this technique.

Date: July 1, 1981

Creator: Phillips, J. R.; Barnes, B. K.; Barnes, M. L.; Hamlin, D. K. & Medina-Ortega, E. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

K-components for the approx. 1. 4-, approx. 1. 6-, and approx. 1. 7-MeV structures in the fission of /sup 232/Th + n

Neutron-induced angle-integrated fission cross sections of /sup 232/Th were measured from 0.7 to 9 MeV with a nominal neutron energy resolution of 0.15 ns/m. Data were taken for the angular intervals 0 to 23.4/sup 0/, 0 to 33.7/sup 0/, 0 to 51.7/sup 0/, and 0 to 90/sup 0/. The structures at approx. 1.4, approx. 1.6, and approx. 1.7 MeV were interpreted in terms of rotational bands with K = 1/2, 3/2, and greater than or equal to 5/2. The approximate relative fission strengths for the K-bonds are… more

Date: July 1, 1981

Creator: Auchampaugh, G. F.; Plattard, S.; Hill, N. W.; de Saussure, G.; Perez, R. B. & Harvey, J. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Optics of mass separator I

The ion optics of an existing mass separator are documented. The elctrostatic and magnetic stages are analyzed theoretically, both separately and in combination, by paying particular attention to the ion trajectories, the linear and angular magnifications, and the dispersion. The possibility of converting the magnet into a tunable unit by means of current-carrying elements in the gap is demonstrated. The feasibility of correction coils constructed from printed circuit board is shown.

Date: July 1, 1981

Creator: Balestrini, S.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Plasma-current fluctuations and decay-rate behavior in the ZT-40 device

A detailed examination of the behavior of the fluctuations of dI/sub plasma//dt in the ZT-40 device over 2500 shots is presented. Historical variations in these fluctuations are discussed along with several possible explanations of these variations. The dependence of these fluctuations on fill pressure, B/sub phi/ at the wall, and the relation of these I/sub phi/ fluctuations to the decay of the plasma current are examined. A physical picture consistent with the observed data is presented to ex… more

Date: July 1, 1981

Creator: Watt, R.G.

Item Type: Report

Partner: UNT Libraries Government Documents Department