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Cold Moderators For Pulsed Neutron Sources
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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 "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 Pulsed Neutron Source Cold Moderators --- Concepts, Design and Engineering by :
Download or read book Pulsed Neutron Source Cold Moderators --- Concepts, Design and Engineering written by and published by . This book was released on 1997 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Moderator design for pulsed neutron sources is becoming more and more an interface area between source designers and instrument designers. Although there exists a high degree of flexibility, there are also physical and technical limitations. This paper aims at pointing out these limitations and examining ways to extend the current state of moderator technology in order to make the next generation neutron sources even more versatile and flexible tools for science in accordance with the users' requirements. (auth).
Book Synopsis Report on the International Workshop on Cold Moderators for Pulsed Neutron Sources by :
Download or read book Report on the International Workshop on Cold Moderators for Pulsed Neutron Sources written by and published by . This book was released on 1999 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Workshop on Cold Moderators for Pulsed Neutron Sources resulted from the coincidence of two forces. Our sponsors in the Materials Sciences Branch of DOE's Office of Energy Research and the community of moderator and neutron facility developers both realized that it was time. The Neutron Sources Working Group of the Megascience Forum of the Organization for Economic Cooperation and Development offered to contribute its support by publishing the proceedings, which with DOE and Argonne sponsorship cemented the initiative. The purposes of the workshop were: to recall and improve the theoretical groundwork of time-dependent neutron thermalization; to pose and examine the needs for and benefits of cold moderators for neutron scattering and other applications of pulsed neutron sources; to summarize experience with pulsed source, cold moderators, their performance, effectiveness, successes, problems and solutions, and the needs for operational data; to compile and evaluate new ideas for cold moderator materials and geometries; to review methods of measuring and characterizing pulsed source cold moderator performance; to appraise methods of calculating needed source characteristics and to evaluate the needs and prospects for improvements; to assess the state of knowledge of data needed for calculating the neutronic and engineering performance of cold moderators; and to outline the needs for facilities for testing various aspects of pulsed source cold moderator performance.
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:
Book Synopsis Materials Research Using Cold Neutrons At Pulsed Neutron Sources by : Chun Keung Loong
Download or read book Materials Research Using Cold Neutrons At Pulsed Neutron Sources written by Chun Keung Loong and published by World Scientific. This book was released on 1999-04-29 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: The applications of the use of cold neutrons for condensed matter research at accelerator-based spallation sources are less well-known than that of the use of cold neutrons at reactor sources. This book represents the outcome of the first international workshop on “Materials Research Using Cold Neutrons at Pulsed Sources”. It consists of overviews of the present status and future trends in research opportunities using cold neutrons, as well as topical papers focusing on the areas of small-angle neutron scattering, reflectivity and spectroscopic studies of a rich variety of materials, from adsorbed molecules to thin films to coal to metallic glasses. These papers will benefit researchers who are interested in the characterization of microscopic properties of advanced materials.
Book Synopsis Elements of Slow-Neutron Scattering by : J. M. Carpenter
Download or read book Elements of Slow-Neutron Scattering written by J. M. Carpenter and published by Cambridge University Press. This book was released on 2015-09-24 with total page 539 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive and up-to-date introduction to the fundamental theory and applications of slow-neutron scattering.
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 The Synthetic Scattering Function and Application to the Design of Cold Moderators for Pulsed Neutron Sources by :
Download or read book The Synthetic Scattering Function and Application to the Design of Cold Moderators for Pulsed Neutron Sources written by and published by . This book was released on 1997 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Synthetic Scattering Function (SSF) allows a simple description of the incoherent interaction of slow neutrons with hydrogenous materials. The main advantages of this model reside in the analytical expressions that it produces for double-differential cross sections, energy-transfer kernels, and total cross sections, which in turn permit the fast evaluation of neutron scattering and transport properties. In this work we briefly discuss basic features of the SSF, review some previous applications to a number of moderating materials, and present new Monte Carlo results for a fast time-response moderator concept based on methane at low temperatures. (auth).
Book Synopsis Some Background Information for the Workshop by :
Download or read book Some Background Information for the Workshop written by and published by . This book was released on 1997 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: By way of an introduction to the Workshop on Cold Moderators for Pulsed Neutron Sources, this paper surveys the highlights of early cold source developments, summarizes the world situation in existing pulsed neutron sources and advanced pulsed neutron source projects, and explores some of the general features and performance of cold moderators for pulsed neutron sources. (auth).
Book Synopsis Proceedings of the international workshop on cold moderators for pulsed neutron sources by :
Download or read book Proceedings of the international workshop on cold moderators for pulsed neutron sources written by and published by . This book was released on 1998 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Instrumentation Using Cold Neutrons at Pulsed Neutron Sources by :
Download or read book Instrumentation Using Cold Neutrons at Pulsed Neutron Sources written by and published by . This book was released on 1997 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper discusses some basic aspects of instrumentation for cold neutrons, with emphasis on conditions peculiar to pulsed sources. It also indicates the conditions under which pulsed source instruments can be most effective for cold neutron research, and presents a brief report on the status of cold neutron instrumentation at pulsed sources.
Book Synopsis Proceedings of the Eleventh Meeting of the International Collaboration on Advanced Neutron Sources ICANS-XI: Plenary session, accelerator workshop, target station workshop by : International Collaboration on Advanced Neutron Sources. Meeting
Download or read book Proceedings of the Eleventh Meeting of the International Collaboration on Advanced Neutron Sources ICANS-XI: Plenary session, accelerator workshop, target station workshop written by International Collaboration on Advanced Neutron Sources. Meeting and published by . This book was released on 1991 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
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 Materials Research Using Cold Neutrons at Pulsed Neutron Sources by : Chun Keung Loong
Download or read book Materials Research Using Cold Neutrons at Pulsed Neutron Sources written by Chun Keung Loong and published by . This book was released on 1999 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Some Concluding Remarks about Cold Moderator Development by :
Download or read book Some Concluding Remarks about Cold Moderator Development written by and published by . This book was released on 1990 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper is the transcription of remarks made at the conclusion of the Workshop on Cold Neutron Sources held at the Los Angeles National Laboratory, Los Alamos, New Mexico, March 5--7, 1990. Areas of interest include the following: scattering functions; cold moderator materials; radiation mixing of chemical composition; comparison of some pulsed moderator spectra; hydrogen mixtures; premoderators and shields; composite reflectors; exotic moderator materials; deuterated methanes; mixed moderator materials; and test facility availabilities. 2 refs., 4 figs., 1 tab. (MHB).
