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Download or read book Performance of the Los Alamos National Laboratory Spallation-driven Solid-deuterium Ultra-cold Neutron Source written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (684 download)
Download or read book A Long-Pulse Spallation Source at Los Alamos written by and published by . This book was released on 1998 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Los Alamos National Laboratory has discussed installing a new 1-MW spallation neutron target station in an existing building at the end of its 800-MeV proton linear accelerator. Because the accelerator provides pulses of protons each about 1 msec in duration, the new source would be a Long Pulse Spallation Source (LPSS). The facility would employ vertical extraction of moderators and reflectors, and horizontal extraction of the spallation target. An LPSS uses coupled moderators rather than decoupled ones. There are potential gains of about a factor of 6 to 7 in the time-averaged neutron brightness for cold-neutron production from a coupled liquid H2 moderator compared to a decoupled one. However, these gains come at the expense of putting ''tails'' on the neutron pulses. The particulars of the neutron pulses from a moderator (e.g., energy-dependent rise times, peak intensities, pulse widths, and decay constant(s) of the tails) are crucial parameters for designing instruments and estimating their performance at an LPSS. Tungsten is the reference target material. Inconel 718 is the reference target canister and proton beam window material, with Al-6061 being the choice for the liquid H2 moderator canister and vacuum container. A 1-MW LPSS would have world-class neutronic performance. The authors describe the proposed Los Alamos LPSS facility, and show that, for cold neutrons, the calculated time-averaged neutronic performance of a liquid H2 moderator at the 1-MW LPSS is equivalent to about 1/4th the calculated neutronic performance of the best liquid D2 moderator at the Institute Laue-Langevin reactor. They show that the time-averaged moderator neutronic brightness increases as the size of the moderator gets smaller.
Author : Susan J Seestrom
Publisher : World Scientific
ISBN 13 : 9814571687
Total Pages : 193 pages
Book Rating : 4.8/5 (145 download)
Download or read book Next Generation Experiments To Measure The Neutron Lifetime - Proceedings Of The Workshop written by Susan J Seestrom and published by World Scientific. This book was released on 2014-03-28 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a great interest in improving the limits on neutron lifetime to the level of a precision of 0.1 s. The neutron lifetime is both an important fundamental quantity as well as a parameter influencing important processes such as nucleosynthesis (Helium production in the early universe) and the rate of energy production in the Sun.Aiming to create a roadmap of R&D for a next generation neutron lifetime experiment that can be endorsed by the North American neutron community, the focus of the workshop was on experiments using traps that utilize ultracold neutrons and confinement by a combination of magnetic and/or gravitational interaction in order to avoid systematic uncertainties introduced by neutron interactions with material walls. The papers in this volume summarize the limitations of present experiments, the discussion of new experiments in planning stage, and the discussion of systematic effects that must be addressed to achieve a lifetime measurement at an accuracy of 0.1 second.Cover image courtesy of Elena Fernández, Los Alamos National Laboratory.
Author : France. Commissariat général du plan
Publisher :
ISBN 13 :
Total Pages : 402 pages
Book Rating : 4.:/5 (492 download)
Download or read book Troisième plan 1958-1961 written by France. Commissariat général du plan and published by . This book was released on 1959 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterization of Solid Deuterium Ultra-cold Neutron Source Production and UCN Transport written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultracold neutrons (UCN) are neutrons with energies below about 330 neV, making it possible to store them in material bottles for hundreds of seconds and guide them into a variety of experiments. Until recently, the available UCN flux has limited the range of problems which can be addressed with UCN. In 2000, a series of experiments at LANSCE demonstrated that a solid deuterium superthermal source, coupled to a spallation target, can potentially provide orders of magnitude improvements in useful UCN density. Since these prototype experiments, a production UCN source has been constructed for the UCNA collaboration in Line B at LANSCE, and another solid deuterium source has been designed to operate at the PULSTAR reactor at NC State university, based on the similar principles. This work will present the initial results and analysis of the LANL UCN source performance and some of the development and design issues for the PULSTAR source. Also a Monte-Carlo analysis of UCN depolarization measurement had been included as a UCN transport study.
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ISBN 13 :
Total Pages : 238 pages
Book Rating : 4.3/5 (243 download)
Download or read book Los Alamos Science written by and published by . This book was released on 2006 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (683 download)
Download or read book A Proposal for a Long-pulse Spallation Source at Los Alamos National Laboratory written by and published by . This book was released on 1995 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Los Alamos National Laboratory is proposing a new spallation neutron source that will provide the US with an internationally competitive facility for neutron science and technology that can be built in approximately three years for less than $100 million. The establishment of a 1-MW, long-pulse spallation source (LPSS) at the Los Alamos Neutron Science Center (LANSCE) will meet many of the present needs of scientists in the neutron scattering community and provide a significant boost to neutron research in the US. The new facility will support the development of a future, more intense spallation neutron source, that is planned by DOE's Office of Energy Research. Together with the existing short pulse spallation source (SPSS) at the Manual Lujan, Jr. Neutron Scattering Center (MLNSC) at Los Alamos, the new LPSS will provide US scientists with a complementary pair of high-performance neutron sources to rival the world's leading facilities in Europe.
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ISBN 13 :
Total Pages : 666 pages
Book Rating : 4.:/5 (16 download)
Download or read book International Workshop on Cold Neutron Sources written by and published by . This book was released on 1991 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first meeting devoted to cold neutron sources was held at the Los Alamos National Laboratory on March 5--8, 1990. Cosponsored by Los Alamos and Oak Ridge National Laboratories, the meeting was organized as an International Workshop on Cold Neutron Sources and brought together experts in the field of cold-neutron-source design for reactors and spallation sources. Eighty-four people from seven countries attended. Because the meeting was the first of its kind in over forty years, much time was spent acquainting participants with past and planned activities at reactor and spallation facilities worldwide. As a result, the meeting had more of a conference flavor than one of a workshop. The general topics covered at the workshop included: Criteria for cold source design; neutronic predictions and performance; energy deposition and removal; engineering design, fabrication, and operation; material properties; radiation damage; instrumentation; safety; existing cold sources; and future cold sources.
Author : Los Alamos National Laboratory
Publisher :
ISBN 13 :
Total Pages : 160 pages
Book Rating : 4.E/5 ( download)
Download or read book Publications of Los Alamos Research written by Los Alamos National Laboratory and published by . This book was released on 1983 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (684 download)
Download or read book Plans for an Ultra Cold Neutron Source at Los Alamos written by and published by . This book was released on 1996 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra Cold Neutrons (UCN) can be produced at spallation sources using a variety of techniques. To date the technique used has been to Bragg scatter and Doppler shift cold neutrons into UCN from a moving crystal. This is particularly applicable to short-pulse spallation sources. We are presently constructing a UCN source at LANSCE using this method. In addition, large gains in UCN density should be possible using cryogenic UCN sources. Research is under way at Gatchina to demonstrate technical feasibility of a frozen deuterium source. If successful, a source of this type could be implemented at future spallation source, such as the long pulse source being planned at Los Alamos, with a UCN density that may be two orders of magnitude higher than that presently available at reactors.
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ISBN 13 :
Total Pages : 2 pages
Book Rating : 4.:/5 (684 download)
Download or read book Technology Development for Cold Neutron Spallation Science written by and published by . This book was released on 1999 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the final report of a Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National laboratory (LANL). The purpose of the activities supported by this project were the development of new techniques; both experimental and theoretical that will allow more effective exploitation of spallation neutron sources.
Author : Frank T Avignone Iii
Publisher : World Scientific
ISBN 13 : 9814545546
Total Pages : 214 pages
Book Rating : 4.8/5 (145 download)
Download or read book The Savannah River Accelerator Project And Complementary Spallation Neutron Sources written by Frank T Avignone Iii and published by World Scientific. This book was released on 1998-02-24 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume is a collection of papers dealing with the applications of spallation neutron sources to pure science, applied science and defense programs. The topics, ranging from accelerator technology to applications in materials science and neutrino physics, are covered by experts in their respective fields.
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ISBN 13 :
Total Pages : 480 pages
Book Rating : 4.3/5 (555 download)
Download or read book Construction and Operation of the Spallation Neutron Source (TN, NY, IL, NM) written by and published by . This book was released on 1999 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Science Program at the Los Alamos Ultracold Neutron Source written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yanping Xu
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (184 download)
Download or read book Characterization of Solid Deuterium Ultracold Neutron Source Production and UCN Transport written by Yanping Xu and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: ucn transport, depolarization, ultracold neutron source.
Download or read book Status Report on the WNR/PSR Pulsed Spallation Neutron Source at the Los Alamos National Laboratory written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Much progress has been made in WNR/PSR facility development and in planning and implementing a full research program since the last ICANS meeting. Construction of the PSR continues on schedule, a significant neutron scattering research program is under way at the WNR that can continue through the construction period, and a formal neutron scattering user program was begun this year. The problem of bothersome backgrounds at the WNR has been solved, and a versatile and effective target-moderator design has been developed. Plans are being implemented for spectrometer construction, data collection and analyses facilities, and a major augmentation in experimental space.
Author : Siegfried S. Hecker
Publisher :
ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.:/5 (321 download)
Download or read book The View from Los Alamos written by Siegfried S. Hecker and published by . This book was released on 1990 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
