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Combined H2 Ch4 Cold Moderator For A Short Pulse Neutron Source
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Book Synopsis Combined H2/CH4 Cold Moderator for a Short Pulse Neutron Source by :
Download or read book Combined H2/CH4 Cold Moderator for a Short Pulse Neutron Source written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 small spheres of solid methane in a matrix of supercritical hydrogen at 25 K. 4 figs.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1989 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced Neutron Sources 1988, Proceedings of the 10th Meeting of the INT Collaboration on Advanced Neutron Sources (ICANS X), Held at Los Alamos, October 1988 by : International Collaboration on Advanced Neutron Sources. Meeting
Download or read book Advanced Neutron Sources 1988, Proceedings of the 10th Meeting of the INT Collaboration on Advanced Neutron Sources (ICANS X), Held at Los Alamos, October 1988 written by International Collaboration on Advanced Neutron Sources. Meeting and published by CRC Press. This book was released on 1990 with total page 908 pages. Available in PDF, EPUB and Kindle. Book excerpt: Revolving around the interaction between spectrometer and target-station design and performance, this volume emphasises the need for feedback that must exist between scientific requirements and source design. It achieves a forum for the sharing of information on the development of spallation neutron sources. Of great value to researchers in condensed matter physics, instrumentation and data processing involved in neutron scattering at pulsed and steady sources.
Book Synopsis Cold Moderators for Spallation Sources by :
Download or read book Cold Moderators for Spallation Sources written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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. Also included is a brief overview of a possible combined H2/Ch4 moderator for high intensity proton beams. 15 figs.
Book Synopsis Neutronic Performance on a Mixed Cold Moderator of Polyethylene Particles and Liquid Hydrogen by :
Download or read book Neutronic Performance on a Mixed Cold Moderator of Polyethylene Particles and Liquid Hydrogen written by and published by . This book was released on 1997 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We measured the neutronic performance of a mixed moderator of polyethylene particles plus liquid hydrogen as the first test of a mixed type moderator. The energy spectrum from the mixed moderator looks like a linear combination of each spectrum from the polyethylene particles and from liquid hydrogen. We obtained 1.2~1.4 times higher cold neutron intensity, but with a longer pulse width than a decoupled liquid hydrogen moderator in the cold neutron region. In the slowing-down region it gave much higher intensity with almost the same pulse width. We found that this type of moderator exhibits better characteristics as a narrow pulse thermal neutron source.
Book Synopsis "Development and Neutronic Validation of Pelletized Cold and Very Cold Moderators for Pulsed Neutron Sources" Phase II Final Report by :
Download or read book "Development and Neutronic Validation of Pelletized Cold and Very Cold Moderators for Pulsed Neutron Sources" Phase II Final Report written by and published by . This book was released on 2012 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intense beams of cold neutrons are produced at several DOE facilities and are used by researchers to study the microscopic structure of materials. Energetic neutrons are produced by a high energy proton beam impacting a target. The fast neutrons are converted to the desired cold neutrons passing through a cryogenic moderator vessel, presently filled with dense cold hydrogen gas. Moderators made from solid methane have demonstrated superior performance to the hydrogen moderators but cannot be implemented on high power sources such as the SNS due to the difficulty of removing heat from the solid blocks of methane. Cryogenic Applications F, Inc has developed the methane pellet formation and transport technologies needed to produce a hydrogen cooled solid methane pellet moderator, potentially capable of being used in a high power spallation neutron facility. Such a methane pellet moderator could double the brightness of the neutron beam. Prior to this work a methane pellet moderator had not been produced or studied. The Indiana University LENS facility is a small pulsed neutron source used in part to study and develop cold neutron moderators. In this project cold neutrons were produced in a solid methane pellet moderator and analyzed with the LENS facility diagnostics. The results indicated that the neutron beam formed by the pellet moderator was similar to that of a solid methane block moderator.
Book Synopsis Neutronic Performance of Cold Moderators in the JAERI 5 MW Pulsed Spallation Source by :
Download or read book Neutronic Performance of Cold Moderators in the JAERI 5 MW Pulsed Spallation Source written by and published by . This book was released on 1997 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report the calculated results of neutronic performance of cold moderators in a reference target-moderator-reflector system at the projected 5 MW pulsed spallation neutron source in Japan Atomic Energy Research Institute (JAERI). The cold neutron intensities in present reference model are about 2.3-2.5 times higher than that from the decoupled solid methane (S-CH4) and close to the values obtained at other facilities (LANSCE Upgrade, NSNS, etc.). The H2O premoderator (PM) reduces the energy deposition in a liquid-hydrogen (L-H2) moderator by about a factor of 2 compared with that in a decoupled L-H2 moderator. The dependence of reflector on the neutron intensity and the energy deposition in the cryogenic moderators is also discussed. Although the pulse shapes were not obtained because of time consuming Monte Carlo calculations, we will discuss the pulse shapes based on experiments. (auth).
Book Synopsis Cold Moderators for Pulsed Neutron Sources by :
Download or read book Cold Moderators for Pulsed Neutron Sources written by and published by . This book was released on 1990 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper reviews cold moderators in pulsed neutron sources and provides details of the performance of different cold moderator materials and configurations. Analytical forms are presented which describe wavelength spectra and emission time distributions. Several types of cooling arrangements used in pulsed source moderators are described. Choices of materials are surveyed. The author examines some of the radiation damage effects in cold moderators, including the phenomenon of burping'' in irradiated cold solid methane. 9 refs., 15 figs., 4 tabs.
Book Synopsis Single Crystal Neutron Diffraction from Molecular Materials by : Chick C. Wilson
Download or read book Single Crystal Neutron Diffraction from Molecular Materials written by Chick C. Wilson and published by World Scientific. This book was released on 2000 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: This important book presents a comprehensive account of the techniques & applications of single crystal neutron diffraction in the area of chemical crystallography & molecular structure. Beginning with a brief description of the general principles & the reasons for choosing the technique - the "why" - the book covers the methods for both the production of neutrons & the measurement of their scattering by molecular crystals - the "how" - followed by a detailed survey of past, present & future applications - the "what". The coverage of both steady state & pulsed neutron sources & instrumentation is extensive, while the survey of applications is the most comprehensive yet undertaken. The book endeavours to show why the technique is an essential method for studying areas as diverse as hydrogen bonding & weak interactions, organometallics, supramolecular chemistry & crystal engineering, metal hydrides, charge density & pharmaceuticals. It is an ideal reference source for the research worker interested in using neutron diffraction to study the structure of molecules. Contents: Crystallography & the Importance of Structural Information; Neutron Scattering; Neutron Diffractometers; Review of Applications I: The Accurate Location of Atoms; Review of Applications II: Hydrogen Bonding & Other Intermolecular Interactions; Review of Applications III: Probing Vibrations & Disorder; Impact on Material Properties & Design; The Future: New Instruments, New Sources, New Techniques. Readership: Students & researchers involved in structural science, especially chemical crystallography.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1989-07 with total page 1534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Intense Neutron Sources by : U.S. Atomic Energy Commission
Download or read book Intense Neutron Sources written by U.S. Atomic Energy Commission and published by . This book was released on 1966 with total page 856 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neutron Scattering written by and published by Academic Press. This book was released on 1986-09-18 with total page 573 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work covers in some detail the application of neutron scattering to different fields of physics, materials science, chemistry, biology, the earth sciences and engineering. Its goal is to enable researchers in a particular area to identify aspects of their work in which neutron scattering techniques might contribute, conceive the important experiments to be done, assess what is required to carry them out, write a successful proposal for one of the major user facilities, and perform the experiments under the guidance of the appropriate instrument scientist. The authors of the various chapters take account of the advances in experimental techniques over the past 25 years--for example, neutron reflectivity and spin-echo spectroscopy and techniques for probing the dynamics of complex materials and biological systems. Furthermore, with the third-generation spallation sources recently constructed in the United States and Japan and in the advanced planning stage in Europe, there is an increasing interest in time-of-flight techniques and short wavelengths. Correspondingly, the improved performance of cold moderators at both reactors and spallation sources has extended the long-wavelength capabilities. Chapter authors are pre-eminent in their field Seminal experiments are presented as examples Provides guidance on how to plan, execute and analyse experiments
Download or read book Physics Briefs written by and published by . This book was released on 1990 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Molten Salts by : Marcelle Gaune-Escard
Download or read book Molten Salts written by Marcelle Gaune-Escard and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several state-of-the-art applications of molten salts are presented, such as metal-molten salt systems, room temperature glass formation, and room temperature melts. Several recent examples of applications highlight the importance of molten salts in various industries (batteries, pyrochemical reprocessing of nuclear fuel, synthesis and catalysis). The basic concepts of the structure, dynamics, electrochemistry, interfacial and thermodynamic properties are detailed and relevant experimental methods described. Such fundamental concepts are essential for an in-depth understanding of the physicochemical properties of molten salts in general, including metal-molten salts, glass forming and low temperature melts. Experimental methods for investigating structural, dynamical, electrochemical thermodynamical and interfacial properties are detailed, as also are techniques for data collection and analysis. Scientists, engineers and technologists will find the volume a valuable reference source covering a wide spectrum of fundamental concepts and modern technologies.
Book Synopsis High Temperature Corrosion by : César A. C. Sequeira
Download or read book High Temperature Corrosion written by César A. C. Sequeira and published by John Wiley & Sons. This book was released on 2018-12-14 with total page 1435 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews the science and engineering of high-temperature corrosion and provides guidelines for selecting the best materials for an array of system processes High-temperature corrosion (HTC) is a widespread problem in an array of industries, including power generation, aerospace, automotive, and mineral and chemical processing, to name a few. This book provides engineers, physicists, and chemists with a balanced presentation of all relevant basic science and engineering aspects of high-temperature corrosion. It covers most HTC types, including oxidation, sulfidation, nitridation, molten salts, fuel-ash corrosion, H2S/H2 corrosion, molten fluoride/HF corrosion, and carburization. It also provides corrosion data essential for making the appropriate choices of candidate materials for high-temperature service in process conditions. A form of corrosion that does not require the presence of liquids, high-temperature corrosion occurs due to the interaction at high temperatures of gases, liquids, or solids with materials. HTC is a subject is of increasing importance in many areas of science and engineering, and students, researchers, and engineers need to be aware of the nature of the processes that occur in high-temperature materials and equipment in common use today, especially in the chemical, gas, petroleum, electric power, metal manufacturing, automotive, and nuclear industries. Provides engineers and scientists with the essential data needed to make the most informed decisions on materials selection Includes up-to-date information accompanied by more than 1,000 references, 80% of which from within the past fifteen years Includes details on systems of critical engineering importance, especially the corrosion induced by low-energy radionuclides Includes practical guidelines for testing and research in HTC, along with both the European and International Standards for high-temperature corrosion engineering Offering balanced, in-depth coverage of the fundamental science behind and engineering of HTC, High Temperature Corrosion: Fundamentals and Engineering is a valuable resource for academic researchers, students, and professionals in the material sciences, solid state physics, solid state chemistry, electrochemistry, metallurgy, and mechanical, chemical, and structural engineers.
Book Synopsis Neutron Scattering – Fundamentals by : Francisco J. Bermejo
Download or read book Neutron Scattering – Fundamentals written by Francisco J. Bermejo and published by Elsevier Inc. Chapters. This book was released on 2013-11-22 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: This chapter reviews the most significant developments that have taken place in the design, construction, and operation of new neutron sources as well as the refurbishment programs of others already serving the neutron-scattering community. Such advances in neutron production devices are to be considered in conjunction with impressive achievements in the optimization of neutron delivery systems as well as in neutron instrumentation which overall resulted in a truly remarkable improvement in neutron count rates. As a result, the capabilities of experimental neutron sources are nowadays larger than ever before, despite there being fewer sources available. It is also worth remarking the coming into line of compact, accelerator-driven neutron sources as well as work carried out at small research reactors which, as exemplified during the past decade, have played an important role in helping the large, user-based facilities to carry out development work geared toward the achievement of full performance.
