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Book Neutron Beam Characterization Measurements at the Manuel Lujan Jr Neutron Scattering Center

Download or read book Neutron Beam Characterization Measurements at the Manuel Lujan Jr Neutron Scattering Center written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have measured the neutron beam characteristics of neutron moderators at the Manuel Lujan Jr. Neutron Scattering Center at LANSCE. The absolute thermal neutron flux, energy spectra and time emission spectra were measured for the high resolution and high intensity decoupled water, partially coupled liquid hydrogen and partially coupled water moderators. The results of our experimental study will provide an insight into aging of different target-moderator-reflector-shield components as well as new experimental data for benchmarking of neutron transport codes.

Book The Manuel Lujan Jr Neutron Scattering Center LANSCE Experiment Reports

Download or read book The Manuel Lujan Jr Neutron Scattering Center LANSCE Experiment Reports written by and published by . This book was released on 1991 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: This year was the third in which LANSCE ran a formal user program. A call for proposals was issued before the scheduled run cycles, and experiment proposals were submitted by scientists from universities, industry, and other research facilities around the world. An external program advisory committee, which LANSCE shares with the Intense Pulsed Neutron Source (IPNS), Argonne National Laboratory examined the proposals and made recommendations. At LANSCE, neutrons are produced by spallation when a pulsed, 800-MeV proton beam impinges on a tungsten target. The proton pulses are provided by the Clinton P. Anderson Meson Physics Facility (LAMPF) accelerator and an associated Proton Storage Ring (PSR), which can alter the intensity, time structure, and repetition rate of the pulses. The LAMPF protons of Line D are shared between the LANSCE target and the Weapons Neutron Research facility, which results in LANSCE spectrometers being available to external users for unclassified research about 80% of each six-month LAMPF run cycle. Measurements of interest to the Los Alamos National Laboratory may also be performed and may occupy up to an additional 20% of the available beam time. These experiments are reviewed by an internal program advisory committee. One hundred thirty-four proposals were submitted for unclassified research and twelve proposals for research of a programmatic nature to the Laboratory. Our definition of beam availability is when the proton current from the PSR exceeds 50% of the planned value. The PSR ran at 65[mu]A current (average) at 20 Hz for most of 1990. All of the scheduled experiments were performed and experiments in support of the LANSCE research program were accomplished during the discretionary periods.

Book The Manuel Lujan Jr Neutron Scattering Center LANSCE Experiment Reports 1988 Run Cycle

Download or read book The Manuel Lujan Jr Neutron Scattering Center LANSCE Experiment Reports 1988 Run Cycle written by Los Alamos National Laboratory and published by . This book was released on 1989 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Manuel Lujan Jr Neutron Scattering Center LANSCE Experiment Reports 1992 Run Cycle

Download or read book The Manuel Lujan Jr Neutron Scattering Center LANSCE Experiment Reports 1992 Run Cycle written by M. A. (ed.) DiStravolo and published by . This book was released on 1993 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Energy Research Abstracts

Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Magnesium Technology 2015

Download or read book Magnesium Technology 2015 written by Michele Manuel and published by Springer. This book was released on 2016-12-26 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Magnesium Technology Symposium, the event on which this collection is based, is one of the largest yearly gatherings of magnesium specialists in the world. Papers represent all aspects of the field, ranging from primary production to applications to recycling. Moreover, papers explore everything from basic research findings to industrialization. Magnesium Technology 2015 covers a broad spectrum of current topics, including alloys and their properties; cast products and processing; wrought products and processing; forming, joining, and machining; corrosion and surface finishing; ecology; and structural applications. In addition, there is coverage of new and emerging applications.

Book Measurement of Residual and Applied Stress Using Neutron Diffraction

Download or read book Measurement of Residual and Applied Stress Using Neutron Diffraction written by M.T. Hutchings and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: The accurate, absolute, and non-destructive measurement of residual stress fields within metallic, ceramic, and composite engineering components has been one of the major problems facing engineers for many years, and so the extension of X-ray methods to the use of neutrons represents a major advance. The technique utilizes the unique penetrating power of the neutron into most engineering materials, combined with the sensitivity of diffraction, to measure the separation of lattice planes within grains of polycrystalline engineering materials, thus providing an internal strain gauge. The strain is then converted to stress using calibrated elastic constants. It was just over ten years ago that the initial neutron diffraction measurements of residual stress were carried out, and during the ensuing decade measurements have commenced at most steady state reactors and pulsed sources around the world. So swift has been the development of the field that, in addition to fundamental scientific studies, commercial measurements have been made on industrial components for several years now. The use of neutrons is ideally suited to the determination of triaxial macrostress tensors, macrostress gradients, and microstresses in composites and multiphase alloys as well as deformed, plastically anisotropic metals and alloys. To date, it has been used to investigate welded and heat-treated industrial components, to characterize composites, to study the response of material under applied loads, to calibrate more portable methods such as ultrasonics, and to verify computer modelling calculations of residual and applied stress.

Book Need for an n Apparatus at the LANSCE

Download or read book Need for an n Apparatus at the LANSCE written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: There is an urgent need for a new (n,?) measurement capability at the Los Alamos Neutrons Science Center (LANSCE) for several reasons. First, it has been shown that (n,?) measurements on medium- to heavy-mass nuclides can provide some of the best constraints on some of the most important reaction rates for explosive nucleosynthesis studies. A few such measurements have been made, but many more are needed. Second, there are a few (n,p) and (n,?) cross sections on lighter nuclides of importance to nuclear astrophysics that remain unmeasured. Third, it has been shown that (n,?) measurements can constrain photon strength functions (PSFs) at very low energies. This is important because recent experiments, theory, and astrophysical calculations have demonstrated that enhanced PSFs at these energies can have large impacts on nucleosynthesis occurring in explosive environments. Also, enhanced low-energy PSFs could have significant impact on (n,?) cross sections of interest to radiochemical diagnostics of nuclear devices. However, the shape of PSFs at low energies is a subject of considerable controversy, so new data are badly needed. Fourth, previous (n,?) data have revealed a number of puzzles and hints of exotic atomic-nuclear interactions. In addition to being interesting in their own light, these interactions could be important for understanding high-energy-density environments such as in nuclear explosion and at the National Ignition Facility. Simulations indicate that the high neutron flux at the Manuel Lujan Jr. Neutron Scattering Center (MLNSC) at the LANSCE will make many more of the needed measurements feasible. Hence, a new (n,?) instrument at the MLNSC would enable a wide range of important and interesting basic and applied science.

Book Energy and Water Development Appropriations for 2000

Download or read book Energy and Water Development Appropriations for 2000 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development and published by . This book was released on 1999 with total page 1484 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Department of Energy Budget Request defense Programs for Fiscal Year 2001 and Related Matters

Download or read book Department of Energy Budget Request defense Programs for Fiscal Year 2001 and Related Matters written by United States. Congress. House. Committee on Armed Services. Subcommittee on Military Procurement and published by . This book was released on 2001 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Department of Defense Chemical Agents and Munitions Destruction Program

Download or read book Department of Defense Chemical Agents and Munitions Destruction Program written by United States. Congress. House. Committee on Armed Services. Subcommittee on Military Procurement and published by . This book was released on 2001 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Fundamental Physics with Pulsed Neutron Beams

Download or read book Fundamental Physics with Pulsed Neutron Beams written by Christopher R. Gould and published by World Scientific. This book was released on 2001 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low energy neutron beams are used to address many questions in nuclear physics, particle physics and astrophysics. The scientific issues include elucidating the nature of time reversal noninvariance; understanding the origin of the baryon asymmetry in the Universe; describing the weak interaction between quarks and between nucleons; understanding the origin of the elements in stellar and big bang nucleosynthesis.This book summarizes how spallation neutron sources work and discuss the advantages of pulsed beams in reducing systematic errors in precision measurements. It also describes recent breakthroughs in ultracold neutron production, together with the physics that will be addressed by the new generation of intense neutron sources.