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in subjects: "Neutron Sources"

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Neutron environment in d + Li facilities

A microscopic d + Li neutron yield model has been developed based upon classical models and experimental data. Using equations suggested by the Serber and evaporation models, a generalized least squares adjustment procedure generated angular yields for E/sub d/ to 40 MeV using the available experimental data. The HEDL-UCD experiment at E/sub d/ = 35 was used to adjust parameters describing the neutron spectra. The model is used to predict yields, spectra, and damage responses in the FMIT Test C… more

Date: January 1, 1980

Creator: Mann, F. M.; Schmittroth, F. & Carter, L. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The Advanced Neutron Source

The Advanced Neutron Source (ANS) is a new user experimental facility planned to be operational at Oak Ridge in the late 1990's. The centerpiece of the ANS will be a steady-state research reactor of unprecedented thermal neutron flux ({phi}{sub th} {approx} 9{center dot}10{sup 19} m{sup -2}{center dot}s{sup -1}) accompanied by extensive and comprehensive equipment and facilities for neutron-based research. 5 refs., 5 figs.

Date: January 1, 1989

Creator: Hayter, J. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Dynamic shear behavior of alumina-filled epoxy

Thin-walled tubular specimens of alumina-filled epoxy were loaded in torsion at a strain rate of approximately 10/sup 3/ s/sup -1/ using a stored-torque Kolsky bar. In addition to measuring the time resolved shear stress and shear strain in the specimen, the axial stress generated by the dilation of the material during shear deformation was also obtained as a function of time. Tests were conducted at room temperature and at -60/sup 0/C. At room temperature, a moderate amount of plastic deformat… more

Date: March 1, 1982

Creator: Costin, L.S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Neutron flux enhancement at LASREF

The accelerator at the Los Alamos Meson Physics Facility produces a 1-mA beam of protons at an energy of 800 MeV. Since 1985, the Los Alamos Spallation Radiation Effects Facility (LASREF) has made use of the neutron flux that is generated as the incident protons interact with the nuclei in targets and a copper beam stop. A variety of basic and applied experiments in radiation damage and radiation effects have been completed. Recent studies indicate that the flux at LASREF can be increased by at… more

Date: January 1, 1991

Creator: Sommer, W. F.; Ferguson, P. D. & Wechsler, M. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Overview of the Division 2351 Neutron Generator Test Facility waveform digitizing system. [Explosively activated neutron generators]

All neutron generator waveforms from units tested at the SLA neutron generator test site are digitized and the digitized data stored in the CDC 6600 tape library for display and analysis using the CDC 6600 computer. The digitizing equipment consists mainly of seven Biomation Model 8100 transient recorders, Digital Equipment Corporation PDP 11/20 computer, RK05 disk, seven-track magnetic tape transport, and appropriate DEC and SLA controllers and interfaces. The PDP 11/20 computer is programmed … more

Date: February 1, 1978

Creator: Bryant, T.C. Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Rod scanner assay of FFTF fuel

Rod scanner results for over 40,000 FFTF Cores 1 and 2 fuel pins are summarized. An improved rod scanner calibration technique for FFTF Cores 3 and 4 fuel pins is described. Data are compared with chemical assay measurements. 5 fig., 5 tables.

Date: January 1, 1978

Creator: Goris, P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Advances in materials science, Metals and Ceramics Division. Triannual progress report, February-May 1980

Research is reported in the magnetic fusion energy and laser fusion energy programs, aluminium-air battery and vehicle research, geothermal research, nuclear waste management, basic energy science, and chemistry and materials science. (FS)

Date: August 1, 1980

Creator: Truhan, J.J. & Gordon, K.M. (eds.)

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Feasibility of beam driven semi-catalyzed deuterium fusion neutron sources for hybrid reactor applications

The assessment is based on the estimation of the fusion device plasma properties using a simple point model, on general energy balance considerations for hybrid reactors for power generation, and on the estimation of expected performance of a specific type of hybrid reactor-a natural uranium fueled, light water moderated breeding hybrid power reactor driven by a semi-catalyzed deuterium fusion neutron source. Beam-driven semi-catalyzed deuterium and D-T fusion devices for hybrid power reactor a… more

Date: December 1, 1977

Creator: Greenspan, E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Force analysis of the advanced neutron source control rod drive latch mechanism

The Advanced Neutron Source reactor (ANS), a proposed Department of Energy research reactor currently undergoing conceptual design at the Oak Ridge National Laboratory (ORNL), will generate a thermal neutron flux approximating 10{sup 30} M{sup {minus}2}{emdash}S{sup {minus}1}. The compact core necessary to produce this flux provides little space for the shim safety control rods, which are located in the central annulus of the core. Without proper control rod drive design, the control rod drive … more

Date: January 1, 1989

Creator: Damiano, B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High intensity linear accelerator development topics for panel discussion on Nuclear Energy Research and Accelerators: Future Prospects''

Two companion papers at this meeting have introduced the subject of high intensity linacs for materials research and for radioactive waste transmutation; Prof. Kaneko's paper Intense Proton Accelerator,'' and my paper Accelerator-Based Intense Neutron Source for Materials R D.'' I will expand on those remarks to briefly outline some of the extensive work that has been done at Los Alamos toward those two application areas, plus a third --- the production of tritium in an accelerator-based facili… more

Date: January 1, 1989

Creator: Jameson, Robert A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Sample environments at IPNS: present and future capabilities

Argonne's Intense Pulsed Neutron Source, IPNS, was dedicated as a major user-oriented neutron scattering facility two years ago. Most instruments are now equipped to provide for sample environments in the temperature range 1.5 < T < 1300K. A special facility provides T < 1mK, and another provides pressures to 30kbar. Several environmental equipment designs are described that emphasize time-of-flight technique. Methods for achieving time-resolved experiments which take advantage of the IPNS puls… more

Date: February 1, 1984

Creator: Faber, J. Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Test of time reversal symmetry with resonance neutron scattering

The possibility of searching for time-reversal symmetry violation in the scattering of epithermal neutrons from nuclei is discussed. Sources of both statistical and systematic errors are reviewed. A qualitative assessment of the size of the time reversal is made and a schematic design of an experiment to test time reversal symmetry is presented. (DWL) 10 refs., 1 fig.

Date: January 1, 1986

Creator: Bowman, J.D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Radiation hardening of diagnostics

The world fusion program has advanced to the stage where it is appropriate to construct a number of devices for the purpose of burning DT fuel. In these next-generation experiments, the expected flux and fluence of 14 MeV neutrons and associated gamma rays will pose a significant challenge to the operation and diagnostics of the fusion device. Radiation effects include structural damage to materials such as vacuum windows and seals, modifications to electrical properties such as electrical cond… more

Date: January 1, 1991

Creator: Siemon, R.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Characterization of low-loss multimode optical fibers for nuclear diagnostics

The application of low loss multimode optical fibers to nuclear diagnostics has been discussed in previous papers. Fiber requirements for this application differ substantially from those for normal communications use. The emphasis for nuclear measurements has been on development of high frequency analog fiber optic transmission line systems, which range from 100 MHz to > 500 MHz signals transmitted at 600 nm and 800 nm, respectively. Accordingly, specialized fiber characterization procedures ov… more

Date: January 1, 1980

Creator: Ogle, J. W.; Nelson, M. A.; Davies, T.J.; Lutz, S.; Lin, C. H.; Theobald, K. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Zetatron neutron tube and pulse transformer for driving it: a transfer of technology to the private sector

The fabrication, testing, and delivery of ten Zetatron tubes (for use in logging probes for U exploration) under Phase I of Contract 07-5363 was successfully completed by Kaman Sciences Corporation. Twelve starts were required to complete ten acceptable tubes. This is an excellent performance record for first-fabrication attempts of a tube design that was new to Kaman Sciences Corporation. The fabrication of test transformer and tube-transformer assemblies required under Phase II of the contrac… more

Date: May 1, 1980

Creator: Volk, R. D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Two-stage nonrecursive filter/decimator

A two-stage digital filter/decimator has been designed and implemented to reduce the sampling rate associated with the long-term computer storage of certain digital waveforms. This report describes the design selection and implementation process and serves as documentation for the system actually installed. A filter design with finite-impulse response (nonrecursive) was chosen for implementation via direct convolution. A newly-developed system-test statistic validates the system under different… more

Date: August 1, 1980

Creator: Yoder, J.R. & Richard, B.D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Magnetic fusion energy annual report, July 1975--September 1976

Supporting research activities continued to provide the technical basis for future mirror-confinement experiments. The industrial development of a high-current, high-field, high-current-density Nb/sub 3/Sn conductor was the main goal of the superconducting magnet program. Beam direct conversion was being developed as a means of raising the efficiency of neutral-beam production, and plasma direct conversion was shown to work as predicted. Conceptual designs were completed for various types of po… more

Date: December 2, 1976

Creator: Harrison, M.A.; McGregor, C.K. & Gottlieb, L. (eds.)

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Accelerator-driven neutron sources for fusion-materials testing

Several accelerator-driven neutron sources have been proposed for satisfying the requirements of a high-flux high-volume international fusion materials testing facility that could be built in the near future. This paper summarizes the features and projected performance for the three accelerator sources that are leading candidates for such a role and that are viewed by the International Energy Agency (IEA) as worthy of further evaluation. These are: (1) the d-Li source, in which 35-MeV deuteron … more

Date: January 1, 1991

Creator: Lawrence, G. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Neutron cross section measurements at ORELA

ORELA (Oak Ridge Electron Linear Accelerator) has been for the last decade the most powerful and useful pulsed neutron time-of-flight facility in the world, particularly in the broad midrange of neutron energies (10 eV to 1 MeV). This position will be enhanced with the addition of a pulse narrowing prebuncher, recently installed and now under test. Neutron capture, fission, scattering, and total cross sections are measured by members of the Physics and Engineering Physics Divisions of ORNL, and… more

Date: January 1, 1979

Creator: Dabbs, J. W. T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Moderated neutron sources for calibrating neutron dosimeters for reactor environments

Neutron dosimeters used around reactor environments are often calibrated with (..cap alpha.., n) sources or /sup 252/Cf sources. Since these sources emit neutrons which are more energetic than those outside power reactors, the readings of dosimeters calibrated in this manner may be erroneous because of the variation in their energy response. To produce calibration sources whose neutrons approximate those to be monitored, certain groups have embedded sources in spheres of various materials. Rece… more

Date: January 1, 1980

Creator: Ing, H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Spallation target-moderator-reflector studies at the Weapons Neutron Research facility. [800-MeV p]

Basic neutronics data, initiated by 800-MeV proton spallation reactions, are important to spallation neutron source development and electronuclear fuel production. Angle-dependent and energy-dependent neutron production cross sections, energy-dependent and total neutron yields, thermal and epithermal neutron surface and beam fluxes, and fertile-to-fissile conversion ratios are being measured. The measurements are being done at the Weapons Neutron Research facility on a variety of targets and ta… more

Date: January 1, 1980

Creator: Russell, G. J.; Gilmore, J. S.; Prael, S. D.; Robinson, H. & Howe, S. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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APSTNG: Neutron interrogation for detection of nuclear and CW weapons, explosives, and drugs

A recently developed neutron diagnostic probe system has the potential to satisfy a significant number of van-mobile and fixed- portal requirements for nondestructive verification of sealed munitions and detection of contraband explosives and drugs. The probe is based on a unique associated-particle sealed-tube neutron generator (APSTNG) that interrogates the object of interest with a low-intensity beam of 14-MeV neutrons generated from the deuterium-tritium reaction and that detects the alpha-… more

Date: January 1, 1992

Creator: Rhodes, E.; Dickerman, C.E.; De Volpi, A. (Argonne National Lab., IL (United States)) & Peters, C.W. (Nuclear Diagnostic Systems, Inc., Springfield, VA (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A comparison of spent fuel assembly control instruments: The Cadarache PYTHON and the Los Alamos Fork

Devices to monitor spent fuel assemblies while stored under water with nondestructive assay methods, have been developed in France and in the United States. Both devices are designed to verify operator's declared values of exposures and cooling-time but the applications and thus the designs of the systems differ. A study, whose results are presented in this paper, has been conducted to compare the features and the performances of the two instruments. 4 refs., 9 figs.

Date: January 1, 1991

Creator: Bignan, G.; Capsie, J.; Romeyer-Dherbey, J. (CEA Centre d'Etudes Nucleaires de Cadarache, 13 - Saint-Paul-lez-Durance (France). Direction des Reacteurs Nucleaires) & Rinard, P. (Los Alamos National Lab., NM (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Comparison of fission neutron and pulsed spallation neutron sources for radiation effects experiments on Cu/sub 3/Au

Through our recent experimental work on the neutron irradiation effects in Cu/sub 3/Au, we will compare fission and pulsed spallation neutron sources. Neutron characteristics of irradiation facilities at the Intense Pulsed Neutron Source (IPNS) and the CP-5 reactor (now closed down), are briefly described. Defect cascade size distributions from irradiations of Cu/sub 3/Au at both neutron sources illustrated by transmission electron micrographs of disordered zones. Radiation-enhanced diffusion e… more

Date: October 1, 1983

Creator: Kirk, M.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department