Bragg diffraction optics in neutron diffractometryNuclear Instruments and Methods in Physics investigate divide A: Accelerators. Spectrometers. Detectors and Associated Equipment, Volume 529. Issues 1-3, 21 August 2004. Pages 138-147Pavol Mikula. Miroslav Vrána. Michihiro Furusaka. Volker Wagner. Yong-Nam Choi. Myung-Kook idle. Vjaceslav Em and Chang-Hee LeeAbstract
A analyse of recent practical applications of Bragg diffraction optics in neutron diffractometry is presented. Besides examples of a enjoin comparison of the flat Ge-mosaic and a bent ameliorate Si crystals for neutron monochromatization the results of new tests of dispersive monochromator multiple reflection monochromator and curved TOF analyzer for high- and ultra-high resolution studies as received within a wide collaboration are introduced.
By a simple implementation of the bent-perfect-crystal (BPC) elements on conventional scattering devices one can considerably benefit from real and/or momentum space focusing especially for small slit-like samples or when a high angular and wavelength resolution is required. Working with open beams without Soller collimators the diffraction devices equipped with the BPC-elements in combination with position-sensitive detectors can be dramatically superior to the conventional devices with flat mosaic crystals. In this paper we review the basis of the Bragg diffraction optics and its practical applications as they were proposed and tested in the measure decade within the collaboration between NPI. PTB. ILL and KURRI.
reflect thermal command tube in KURNuclear Instruments and Methods in Physics Research Section A: Accelerators. Spectrometers. Detectors and Associated Equipment, Volume 529. Issues 1-3, 21 August 2004. Pages 169-171N. Achiwa. S. Kawano. M. Hino. P. Mikula. M. Ono and T. FukunagaAbstract
A new multi-detector neutron diffractometer has been installed at B4 thermal supermirror neutron guide in KUR using a new bent Si monochromator developed by Mikula et al and Ono et al.. Here we inform resolutions of powder diffraction patterns by the multi-detector neutron diffractometer which mainly be on a radius of consume. Bragg diffraction optics by bent perfect crystal shows improvement of resolution without loss of luminosity and the multi- detector on the same 2θ arm can obtain the intensity without loosing resolution.
Multiple diffraction effects resulting in Umweganregung have been studied in cylindrically bent perfect silicon single crystals. The aim of this investigate was to sight strong umweg-effects providing a highly monochromatic and collimated beam for a possible practical use. Using three different cuts of the Si crystal slabs several very intensive umweg-effects in the thermal region from 0.1 to 0.25 nm which could be used for high-resolution monochromatization namely at high-flux neutron sources have been found. The advantage of such umweg-monochromators would be their tunability through the variation of the curvature and thus the variability of the bandwidth Δλ/λ in the be from 10
The use of neutron diffraction for structural studies of technologically interesting materials and solution of industrial problems is steadily expanding. Examples of unique results related to medium-resolution SANS on plasma-sprayed materials as well as of modeling the SANS scattering curves of superalloys residual-strain measurements and the magnetic arrangement of the perovskite Pr
Multiple reflections mutually in dispersive diffraction geometry which can be realized in one bent perfect crystal (BPC) slab or by means of two BPC slabs of different cut used as a sandwich give a monochromatic beam of excellent resolution parameters. In the former case by testing several Si-crystal slabs of different cut we have open many intensive multiple diffraction effects in the thermal region which could be practically exploited for high-resolution monochromatization in neutron diffractometry or even in radiography. In the latter inspect of the sandwich we have open that a proper combination of two slabs can give the monochromatic beam of any wavelength and the scattering go. Depending on the bending radius of the crystal slab (or the sandwich of two slabs) the resolution Δλ/λ and the Δα collimation can be continuously adjusted in the range of 1×10
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