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Two small-angle neutron scattering instruments have been designed and optimized for installation at a 1 MW long pulse spallation source. The first of these instruments allows access to length scales in materials from 10 to 400 Å, and the second instrument from 40 to 1200 Å. Design characteristics were determined and optimization was done using the MCLIB Monte Carlo instrument simulation package. The code has been {open_quote}benchmarked{close_quote} by simulating the {open_quote}as-built{close_quote} D11 spectrometer at ILL and a performance comparison of the three instruments was made. Comparisons were made by evaluating the scattered intensity for [delta] scatterers at different Q values for various instrument configurations needed to span a Q-range of 0.0007 - 0.44 Å−1.
We studied the design and performance of a small-angle neutron scattering (SANS) instrument for a proposed 1 MW, 60 Hz long pulsed spallation source at the Los Alamos Neutron Science Center (LANSCE). An analysis of the effects of source characteristics and chopper performance combined with instrument simulations using the LANSCE Monte Carlo instrument simulations package shows that the T0 chopper should be no more than 5 m from the source with the frame overlap and frame definition choppers at 5.6 and greater than 7 m, respectively. The study showed that an optimal pulse structure has an exponential decaying tail with [tau] ≈ 750 [mu]s. The Monte Carlo simulations were used to optimize the LPSS SANS, showing that an optimal length is 18 m. The simulations show that an instrument with variable length is best to match the needs of a given measurement. The performance of the optimized LPSS instrument was found to be comparable with present world standard instruments.
This book examines the meso- and nanoscopic aspects of fluid adsorption in porous solids using a non-invasive method of small angle neutron scattering (SANS) and small angle x-ray scattering (SAXS). Starting with a brief summary of the basic assumptions and results of the theory of small-angle scattering from porous media, the author focuses on the practical aspects and methodology of the ambient and high pressure SANS and SAXS experiments and corresponding data analysis. It is illustrated with results of studies of the vapor and supercritical fluid adsorption in porous materials published during the last decade, obtained both for man-made materials (e.g. porous fractal silica, Vycor glass, activated carbon) and geological samples (e.g. sandstones, shales and coal). In order to serve the needs of broad readership, the results are presented in the relevant context (e.g. petroleum exploration, anthropogenic carbon capture and sequestration, ion adsorption in supercapacitors, hydrogen storage, etc.).
This book describes all aspects of the technique of small-angle scattering of X-rays and neutrons, including instrumentation, sample requirements, data interpretation and modelling methods, in a comprehensive way and gives examples of applications in various fields of biophysics and biochemistry.
Based partly on the original importers' catalogues and partly on the wide range of pieces handled by the author Bryan Catley, a leading specialist in the subject, this book covers a comprehensive range of art deco figures. Between the wars, an entirely modern style of decorative sculpture emerged which was a complete break with the heavy romantic late 19th century schools, and was totally in sympathy with the vibrant young society of the 1920s. The use of bronze and ivory for the great number of these sensual figures in no way obscures the the fact that many are of exceptionally high quality; add to this their sense of movement and rhythm and one realises that the large sums thay now command is a reflection of a discriminative international collectors' market. This new revised edition provides a comprehensive listing of the great variety and range of figures, of which there are still more to be found.
This book covers the most common neutron detectors used in neutron scattering facilities and all of those in use at Oak Ridge National Lab. It starts describing the facilities, instruments and the critical detector parameters needed by various instruments. Then the key components of the 3He-based linear position-sensitive detectors as well as on their electronics, which require particular attention to signal processing and noise reduction, are introduced. One chapter is dedicated to the 3He alternatives where scintillators play a critical role. It also covers emerging neutron detection technologies including semiconductors, vacuum-based devices and their associated readouts, which will be required in the future for high rate and high-resolution neutron detectors. The authors explain the logic behind the choice of materials as well as the various constraints that neutron detectors must respect to be useful. Some of these constraints, such as efficiency and gamma-ray sensitivity are common to all neutron counters while others, like timing resolution, dynamic range, and peak counting rate, depend on the applications. The book guides experts, the nuclear science community, and young scholars through the physical processes and the required electronics in a way that is accessible for those not professionally involved in designing detector’s components and electronic circuits.
This book provides a comprehensive and up-to-date introduction to the fundamental theory and applications of slow-neutron scattering.
Neutron scattering proves itself a highly international area of research as scientists and engineers from twenty-one countries come together in this volume - to discuss the growth and maturation of the use of neutrons as a probe in materials research and to survey current applications. A wide range of materials are examined, including polymers, cements, high-Tc superconducting oxides and carbides, inorganic glasses, magnetic films, ceramics and metallic alloys. Topics include: instrumentation at major neutron facilities in North America; developments in instrumentation and techniques; neutron reflectivity studies of surfaces and interfaces; small angle neutron scattering (SANS) studies of polymers and complex fluids; SANS studies of ceramics and metals; residual stress analysis; cementitious materials; high-Tc superconducting materials; interfaces, multilayers and nanocrystals of magnetic materials; oxide materials; inorganic glasses; alloys; and adsorbed systems, inelastic scattering and dynamics.