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Title: General information and guide for the neutron and x-ray facilities of the National Center for Small-Angle Scattering Research

Abstract

The 30-m SANS instrument, 10-m SAXS camera, 10-m SANS instrument, and the high-resolution double-crystal SANS instrument are described. Brief descriptions are given of proposal guidelines, measurements, and publications. (WRF)

Publication Date:
Research Org.:
Oak Ridge National Lab., TN (USA)
OSTI Identifier:
6155981
Report Number(s):
ORNL/M-350
ON: DE87012334
DOE Contract Number:
AC05-84OR21400
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; SCATTERING; BEAM OPTICS; CAMERAS; MANUALS; NEUTRONS; BARYONS; DOCUMENT TYPES; ELEMENTARY PARTICLES; FERMIONS; HADRONS; NUCLEONS; 420200* - Engineering- Facilities, Equipment, & Techniques; 656000 - Condensed Matter Physics; 360000 - Materials

Citation Formats

Not Available. General information and guide for the neutron and x-ray facilities of the National Center for Small-Angle Scattering Research. United States: N. p., 1987. Web. doi:10.2172/6155981.
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Not Available. General information and guide for the neutron and x-ray facilities of the National Center for Small-Angle Scattering Research. United States. doi:10.2172/6155981.
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Not Available. Sun . "General information and guide for the neutron and x-ray facilities of the National Center for Small-Angle Scattering Research". United States. doi:10.2172/6155981. https://www.osti.gov/servlets/purl/6155981.
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@article{osti_6155981,
title = {General information and guide for the neutron and x-ray facilities of the National Center for Small-Angle Scattering Research},
author = {Not Available},
abstractNote = {The 30-m SANS instrument, 10-m SAXS camera, 10-m SANS instrument, and the high-resolution double-crystal SANS instrument are described. Brief descriptions are given of proposal guidelines, measurements, and publications. (WRF)},
doi = {10.2172/6155981},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Mar 01 00:00:00 EST 1987},
month = {Sun Mar 01 00:00:00 EST 1987}
}
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Technical Report:
View Technical Report (0.73 MB)
DOI:  10.2172/6155981
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  • ;
    Reports are presented on small angle scattering of alloys, emulsion, micellar systems, polymers, and biological materials. (CS)

  • In this work we give a detailed account of the use of small angle neutron scattering to study the properties of polymer mediated, self assembled nanoparticle arrays as a function of annealing temperature. The results from neutron scattering are compared with those obtained from x-ray diffraction. Both techniques show that particle size increases with annealing temperatures of 580 C and above. They also show that the distribution of particle diameters is significant and increases with annealing temperature. The complementary nature of the two measurements allows a comprehensive structural model of the assemblies to be developed in terms of particle sinteringmore » and agglomeration. To realize the potential of nanoparticle assemblies as a monodispersed data storage medium the problem of particle separation necessary to avoid sintering and agglomeration during annealing must be addressed.« less

  • A new facility for small-angle neutron scattering near completion at the NBS Research Reactor is described. The instrument uses a 65 x 65 sq cm position-sensitive detector, variable incident wavelength, and a novel converging-beam collimation system. The instrument and its capabilities are discussed, along with measurements indicative of its performance.

  • ; ;
    The small angle neutron scattering technique is a valuable method for the characterization of morphology of various materials. It can probe inhomogeneties in the sample (whether occurring naturally or introduced through isotopic substitution) at a length scale from the atomic size (nanometers) to the macroscopic (micrometers) size. The work provides an overview of the small angle neutron scattering facilities at the National Institute of Standards and Technology and a review of the technique as it has been applied to polymer systems, biological macromolecules, ceramic, and metallic materials. Specific examples have been included.

  • ; ; ; ...
    The major issues regarding irradiation effects are discussed in [1-3] and have also been discussed in previous progress and milestone reports. As noted previously, of the many significant issues discussed, the issue considered to have the most impact on the current regulatory process is that associated with effects of neutron irradiation on RPV steels at high fluence, for long irradiation times, and as affected by neutron flux. It is clear that embrittlement of RPV steels is a critical issue that may limit LWR plant life extension. The primary objective of the LWRSP RPV task is to develop robust predictions ofmore » transition temperature shifts (TTS) at high fluence ( t) to at least 1020 n/cm 2 (>1 MeV) pertinent to plant operation of some pressurized water reactors (PWR) for 80 full power years. Correlations between the high flux test reactor results and low flux surveillance specimens must be established for proper RPV embrittlement predictions of the current nuclear power fleet. Additionally, a complete understanding of defect evolution for high nickel RPV steels is needed to characterize the embrittlement potential of Mn-Ni-enriched precipitates (MNPs), particularly for the high fluence regime. While understanding of copper-enriched precipitates (CRPs) have been fully developed, the recent discovery and experimental verification [4] of late blooming MNPs with little to no copper for nucleation has stimulated research efforts to understand the evolution of these phases. New and existing databases will be combined to support developing physically based models of TTS for high fluence-low flux ( < 10 11n/cm 2-s) conditions, beyond the existing surveillance database, to neutron fluences of at least 1 1020 n/cm2 (>1 MeV). Moreover, large number of various RPV materials have been irradiated in ATR-2 experiment and will be jointly studied by University of California Santa Barbara (UCSB) and ORNL to address majority of microstructural characteristics discussed above, see Ref. [5] and [6] for details. UCSB has performed a large number of SANS experiments in the past at the National Institute of Standards and Technology (NIST) Center for Neutron Research (NCNR). These data are taken from RPV steels irradiated in a wide range of flux-fluence space and will be very useful in comparing to the upcoming UCSB ATR-2 irradiation characterization since most of the SANS experiments with ATR-2 materials will be performed at ORNL High Flux Isotope Reactor (HFIR). However in the previous report [7], some discrepancies were observed between HFIR and NCNR generated data. One of the hypotheses was that there was some kind of extra scattering occurring off the sample holders that results in the HFIR curves falling above the NCNR curves. To test this hypothesis, UCSB provided thermally aged samples that have been previously run at NCNR to ORNL for testing at HFIR while ORNL performed some improvements to experimental set up at HFIR. This report provides the status for the Level 3 Milestone (M3LW-15OR0402013), Complete report detailing comparative analysis of results from High Flux Isotope Reactor and National Institute of Standards and Technology small-angle neutron scattering experiments. This milestone is associated with small-angle neutron scattering characterization at the High Flux Isotope Reactor of various model alloys that had been previously characterized at NCNR by UCSB.« less