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IN-LINE CHEMICAL SENSOR DEPLOYMENT IN A TRITIUM PLANT

Description: The Savannah River Tritium Plant (TP) relies on well understood but aging sensor technology for process gas analysis. Though new sensor technologies have been brought to various readiness levels, the TP has been reluctant to install technologies that have not been tested in tritium service. This gap between sensor technology development and incorporating new technologies into practical applications demonstrates fundamental challenges that exist when transitioning from status quo to state-of-the… more
Date: October 2, 2013
Creator: Tovo, L.; Wright, J.; Torres, R. & Peters, B.
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Partner: UNT Libraries Government Documents Department
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Lithium Isotope Separation by Electrolysis

Description: Two approaches to lithium isotope separation have been followed in this research and are described and compared. One is electrolysis in non-aqueous systems at high cathode efficiency. The other is electrolysis in aqueous systems with anode depolarizers.
Date: September 4, 1950
Creator: Kennedy, Joseph W
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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LANSCE (Manuel Lujan, Jr. Neutron Scattering Center) target system performance

Description: We measured neutron beam fluxes at LANSCE using gold foil activation techniques. We did an extensive computer simulation of the as-built LANSCE Target/Moderator/Reflector/Shield geometry. We used this mockup in a Monte Carlo calculation to predict LANSCE neutronic performance for comparison with measured results. For neutron beam fluxes at 1 eV, the ratio of measured data to calculated varies from /approx/0.6-0.9. The computed 1 eV neutron leakage at the moderator surface is 3.9 /times/ 10/sup … more
Date: January 1, 1989
Creator: Russell, G. J.; Gilmore, J. S.; Robinson, H.; Legate, G. L.; Bridge, A.; Sanchez, R. J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The advanced neutron source reactor: An overview

Description: The Advanced Neutron Source (ANS) will be a new user facility for all kinds of neutron research, including neutron scattering, materials testing, materials analysis, isotope production and nuclear physics experiments. The centerpiece of the facility is to be the world's highest flux beam reactor. There will be beams of hot, cold and thermal neutrons for more than 40 simultaneous scattering and nuclear physics experiments. In addition, there will be irradiation positions and rabbit tubes for in-… more
Date: January 1, 1990
Creator: West, C.D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Cold moderators for spallation sources

Description: Moderators using liquid and solid methane and liquid hydrogen are currently in use at major spallation neutron sources. Los Alamos Neutron Scattering Center (LANSCE) is planning the use of liquid methane as part of a major update program planned in about three years time. This report presents a general overview of some of these devices and outlines the general engineering design of the proposed LANSCE moderator, including some suggested solutions to the radiation damage problems of methane. Als… more
Date: January 1, 1988
Creator: Lucas, A.T. & Robinson, H.
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Partner: UNT Libraries Government Documents Department
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The advanced neutron source

Description: 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} 8 {times} 10{sup 19} m{sup {minus}2} {center dot}s{sup {minus}1}) accompanied by extensive and comprehensive equipment and facilities for neutron-based research.
Date: January 1, 1990
Creator: Raman, S. & Hayter, J. B.
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Partner: UNT Libraries Government Documents Department
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Proceedings of the sixth meeting of the international collaboration on advanced neutron sources

Description: Papers were presented in four major areas: status reports from ICANS laboratories and projects; instrumentation; targets and moderators designs and tests; and nuclear data and codes. Of the 49 papers in the proceedings, 10 were prepared previously for the data base, and 32 were prepared for this issue. (GHT)
Date: January 1, 1983
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Partner: UNT Libraries Government Documents Department
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Optical design for the NSLS crystallography beam line

Description: The design goal of this beam line is to produce a photon beam well suited to accurate single-crystal diffraction measurements, with particular attention to the possibilities of the use of anomalous dispersion. These goals lead to the following criteria: (1) A beam uniform in intensity to 1% over an area 0.3 x 0.3 mm/sup 2/, (2) ..delta..E/E approx. = 5 x 10/sup -4/, and (3) Tunable over the energy range 5 to 21 keV accessible from a NSLS bending magnet. These criteria lead to a number of design… more
Date: January 1, 1982
Creator: Hastings, J. B.; Suortti, P.; Thomlinson, W.; Kvick, A. & Koetzle, T. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High resolution monochromator systems using thermal gradient induced variable Bragg spacing

Description: The vertical divergences of bending magnet and wiggler synchrotron sources are generally considerably larger than the acceptance angles of typical monochromator systems. This is particularly true at high energies (E greater than or equal to 14 keV) where the Darwin widths of perfect crystals are of the order 10/sup -6/ radians. By imposing a thermal gradient on the crystal, an efficient, wide acceptance angle monochromator can be obtained. The necessary condition being that the resulting d . si… more
Date: July 1, 1985
Creator: Knapp, G. S. & Smither, R. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Intense positron beams: linacs. Preworkshop copy

Description: Beams of monoenergetic positrons with energies of a few eV to many keV have been used in experiments in atomic physics, solid state physics and materials science. The production of positron beams from a new source, an electron linac, is described. Intense, pulsed beams of low-energy positrons have been produced by a high-energy beam from an electron linac. The production efficiency, moderator geometry, beam spot size and other positron beam parameters have been determined for electrons with ene… more
Date: September 1, 1983
Creator: Howell, R. H.; Alvarez, R. A.; Woodle, K. A.; Dhawan, S.; Egan, P. O.; Hughes, V. W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Recent progress at RTNS-II

Description: The Rotating Target Neutron Source (RTNS-II) facility produces 14-MeV neutrons for materials damage studies. Initial operation for irradiations, which occurred in 1979, began with a neutron source strength of 10/sup 13/ n/s utilizing one of the accelerator-based neutron sources. Details are given on improvements which have resulted in both increased neutron production and neutron source strength and improved control and monitoring. 8 references.
Date: September 26, 1984
Creator: Heikkinen, D.W. & Logan, C.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The advanced neutron source--designing to meet the needs of the user community

Description: The Advanced Neutron Source (ANS) is to be a multi-purpose neutron research center, constructed around a high-flux reactor now being designed at the Oak Ridge National Laboratory (ORNL). Its primary purpose is to place the United States in the forefront of neutron scattering in the twenty-first century. Other research programs include nuclear and fundamental physics, isotopes production, materials irradiation, and analytical chemistry. The Advanced Neutron Source will be a unique and invaluable… more
Date: January 1, 1989
Creator: Peretz, F.J. (Oak Ridge National Lab., TN (USA))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The US Advanced Neutron Source

Description: The Advanced Neutron Source (ANS) is to be a new user experimental facility for all fields of neutron research. The most important scientific justification for the ANS Project is to provide intense beams of neutrons for scattering and other experiments: neutron scattering is a primary tool of basic and applied materials science. Facilities will also be provided for engineering materials irradiation tests, isotope production (including transplutonium elements), and materials analysis. More than … more
Date: January 1, 1988
Creator: West, C.D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Combined H/sub 2//CH/sub 4/ cold moderator for a short pulse neutron source

Description: Very low temperature methane would be an ideal moderating material as it has a high hydrogen density and many low frequency modes which facilitate thermalization. Such moderators are in service at two major world facilities, KEK (Japan) and Argonne National Laboratory (USA). Unfortunately solid methane has very low thermal conductivity and is subject to radiation damage making a moderator of this type impractical for use in high intensity beam. This report outlines a possible alternative using … more
Date: January 1, 1988
Creator: Williamson, K.D. & Lucas, A.T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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List of DOE radioisotope customers with summary of radioisotope shipments, FY 1979

Description: The fifteenth edition of the radioisotope customer list was prepared at the request of the Division of Financial Services, Office of the Assistant Secretary for Environment, Department of Energy (DOE). This document lists DOE's radioisotope production and distribution activities by its facilities at Argonne National Laboratory; Pacific Northwest Laboratory; Brookhaven National Laboratory; Hanford Engineering Development Laboratory; Idaho Operations Office; Los Alamos Scientific Laboratory; Moun… more
Date: June 1, 1980
Creator: Burlison, J.S. (comp.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Virtual Gamma Ray Radiation Sources through Neutron Radiative Capture

Description: The countrate response of a gamma spectrometry system from a neutron radiation source behind a plane of moderating material doped with a nuclide of a large radiative neutron capture cross-section exhibits a countrate response analogous to a gamma radiation source at the same position from the detector. Using a planar, surface area of the neutron moderating material exposed to the neutron radiation produces a larger area under the prompt gamma ray peak in the detector than a smaller area of dime… more
Date: July 1, 2008
Creator: Scott Wilde, Raymond Keegan
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Partner: UNT Libraries Government Documents Department
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The Advanced Photon Source: A status report

Description: The Advanced Photon Source (APS) currently under construction at Argonne National Laboratory is scheduled for completion in early 1996. Both conventional facilities construction and technical fabrication is well underway. An update on the current state of civil construction as well as progress on storage ring and beamline technical component development will be presented. User activities have also proceeded at a rapid pace, particularly over the last year. In response to a call for Proposals fo… more
Date: January 1, 1992
Creator: Mills, D.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Optical systems for synchrotron radiation. Lecture 2. Mirror systems

Description: The process of reflection of VUV and x-radiation is summarized. The functions of mirrors in synchrotron beamlines are described, which include deflection, filtration, power absorption, formation of a real image, focusing, and collimation. Fabrication of optical surfaces for synchrotron radiation beamlines are described, and include polishing of a near spherical surface as well as bending a cylindrical surface to toroidal shape. The imperfections present in mirrors, aberrations and surface figur… more
Date: February 1, 1986
Creator: Howells, M.R.
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Partner: UNT Libraries Government Documents Department
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Varied line-space gratings and applications

Description: This paper presents a straightforward analytical and numerical method for the design of a specific type of varied line-space grating system. The mathematical development will assume plane or nearly-plane spherical gratings which are illuminated by convergent light, which covers many interesting cases for synchrotron radiation. The gratings discussed will have straight grooves whose spacing varies across the principal plane of the grating. Focal relationships and formulae for the optical grating… more
Date: July 15, 1991
Creator: McKinney, W.R.
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Partner: UNT Libraries Government Documents Department
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Plasma flow switch experiments on the Pegasus facility

Description: Plasma flow switch experiments conducted on Pegasus have shown that a conducting layer of plasma shunts the load slot preventing efficient switching of current to the load. This effect is seen computationally. The magnitude of the effect depends on the specific parameters of the switch plasma and current level. Computations have also shown that a plasma boundary layer trap'' would effectively remove enough plasma from the inner conductor of the power flow channel so that efficient switching wou… more
Date: January 1, 1991
Creator: Cochrane Jr., J. C.; Anderson, B.; Bartsch, R. R.; Bowers, R.; Findley, C.; Greene, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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