The new high resolution ultra small-angle neutron scattering instrument at the High Flux Reactor in Grenoble

Two different small-angle neutron scattering (SANS) facilities, the D11 camera at the Institut Laue–Langevin (ILL, Grenoble, France) and the LOQ time-of-flight diffractometer at the Rutherford Appleton Laboratory (RAL, Didcot, Oxon, England), were used in the investigations of δ′-Al3Li precipitation at 463 K in Al–Li 3% alloy. The results obtained from the steady-state reactor and from the pulsed source by using two different data-acquisition techniques and two different procedures for data analysis are compared. The SANS curves for the same set of samples investigated using the two different instruments are in good agreement within the experimental uncertainties. A check was also made on the metallurgically relevant quantities, namely the average size and the size-distribution function of the δ′ precipitates at the various stages of the ageing process, obtained from the two sets of SANS curves by applying the same numerical method. Good agreement was found between the results from the two data sets.

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The suite of small-angle neutron scattering instruments at Oak Ridge National Laboratory

Journal of Applied Crystallography ◽

10.1107/s1600576718001231 ◽

2018 ◽

Vol 51 (2) ◽

pp. 242-248 ◽

Cited By ~ 32

Author(s):

William T. Heller ◽

Matthew Cuneo ◽

Lisa Debeer-Schmitt ◽

Changwoo Do ◽

Lilin He ◽

...

Keyword(s):

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Large Scale ◽

National Laboratory ◽

High Flux ◽

Oak Ridge ◽

Large Scale Structures ◽

Oak Ridge National Laboratory ◽

Scale Structures

Oak Ridge National Laboratory is home to the High Flux Isotope Reactor (HFIR), a high-flux research reactor, and the Spallation Neutron Source (SNS), the world's most intense source of pulsed neutron beams. The unique co-localization of these two sources provided an opportunity to develop a suite of complementary small-angle neutron scattering instruments for studies of large-scale structures: the GP-SANS and Bio-SANS instruments at the HFIR and the EQ-SANS and TOF-USANS instruments at the SNS. This article provides an overview of the capabilities of the suite of instruments, with specific emphasis on how they complement each other. A description of the plans for future developments including greater integration of the suite into a single point of entry for neutron scattering studies of large-scale structures is also provided.

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Neutron Larmor diffraction on powder samples

Journal of Applied Crystallography ◽

10.1107/s160057671901611x ◽

2020 ◽

Vol 53 (1) ◽

pp. 88-98 ◽

Cited By ~ 1

Author(s):

Thomas Keller ◽

Piotr Fabrykiewicz ◽

Radosław Przeniosło ◽

Izabela Sosnowska ◽

Bernhard Keimer

Keyword(s):

Experimental Data ◽

High Resolution ◽

Synchrotron Radiation ◽

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Spin Echo ◽

Analysis Technique ◽

Momentum Resolution ◽

Powder Samples

A hitherto unrecognized resolution effect in neutron Larmor diffraction (LD) is reported, resulting from small-angle neutron scattering (SANS) in the sample. Small distortions of the neutron trajectories by SANS give rise to a blurring of the Bragg angles of the order of a few hundredths of a degree, leading to a degradation of the momentum resolution. This effect is negligible for single crystals but may be significant for polycrystalline or powder samples. A procedure is presented to correct the LD data for the parasitic SANS. The latter is accurately determined by the SESANS technique (spin–echo small-angle neutron scattering), which is readily available on Larmor diffractometers. The analysis technique is demonstrated on LD and SESANS data from α-Fe2O3 powder samples. The resulting d-spacing range agrees with experimental data from high-resolution synchrotron radiation powder diffraction on the same sample.

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Structural characterization of manganese-substituted nanocrystalline zinc oxide using small-angle neutron scattering and high-resolution transmission electron microscopy

Journal of Applied Crystallography ◽

10.1107/s002188980903475x ◽

2009 ◽

Vol 42 (6) ◽

pp. 1085-1091 ◽

Cited By ~ 7

Author(s):

B. Roy ◽

B. Karmakar ◽

J. Bahadur ◽

S. Mazumder ◽

D. Sen ◽

...

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Zinc Oxide ◽

High Resolution ◽

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron

A series of zinc oxide (ZnO) nanoparticles, substituted with manganese di-oxide, have been synthesized through a modified ceramic route using urea as a fuel. X-ray diffraction and high-resolution transmission electron microscopy studies indicate that the sizes of the ZnO particles are of nanometer dimension. Particles remain as single phase when the doping concentration is below 15 mol%. Small-angle neutron scattering indicates fractal-like agglomerates of these nanoparticles in powder form. The size distributions of the particles have been estimated from scattering experiments as well as microscopy studies. The average particle size estimated from small-angle scattering experiments was found to be somewhat more than that obtained from X-ray diffraction or electron microscopy measurement.

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Optimization of the thickness of a ZnS/6LiF scintillator for a high-resolution detector installed on a focusing small-angle neutron scattering spectrometer (SANS-U)

Journal of Applied Crystallography ◽

10.1107/s0021889812008928 ◽

2012 ◽

Vol 45 (3) ◽

pp. 507-512 ◽

Cited By ~ 5

Author(s):

Hiroki Iwase ◽

Masaki Katagiri ◽

Mitsuhiro Shibayama

Keyword(s):

High Resolution ◽

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Detection Efficiency ◽

Pulse Height ◽

Atomic Energy ◽

Japan Atomic Energy Agency ◽

Energy Agency ◽

Position Sensitive

This study involves the upgrade of a high-resolution position-sensitive detector (HR-PSD) installed on the small-angle neutron scattering spectrometer (SANS-U) at the Japan Atomic Energy Agency. By using both neutron lenses and the HR-PSD, the accessible low-Qlimit can be extended to the order of 10−4 Å−1[Qis the magnitude of the scattering vector defined byQ= (4π/λ)sinθ, where λ and 2θ are the wavelength and the scattering angle, respectively]. The HR-PSD consists of a cross-wired position-sensitive photomultiplier tube (PSPMT) and a commercial ZnS/6LiF scintillator. To improve the experimental efficiency of focusing small-angle neutron scattering (FSANS) experiments, a high-performance ZnS/6LiF scintillator developed at the Japan Atomic Energy Agency has been utilized. For the PSPMT and data-acquisition system installed on SANS-U, the thickness of the ZnS/6LiF scintillator was optimized by measuring the thickness dependence of the pulse-height spectra. Under the experimental conditions of SANS-U, the optimum thickness of the ZnS/6LiF scintillator (ZnS:6LiF = 2:1) was determined to be 0.433 mm by measuring the total counts and peak positions of the pulse-height spectra. Installation of the optimized ZnS/6LiF scintillator improved detection efficiency by 1.39 times over that of a commercial scintillator at the same level of background counts andQresolution in FSANS experiments.

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Modernization of the small-angle neutron scattering spectrometer SANS-U by upgrade to a focusing SANS spectrometer

Journal of Applied Crystallography ◽

10.1107/s0021889811007527 ◽

2011 ◽

Vol 44 (3) ◽

pp. 558-568 ◽

Cited By ~ 24

Author(s):

Hiroki Iwase ◽

Hitoshi Endo ◽

Masaki Katagiri ◽

Mitsuhiro Shibayama

Keyword(s):

High Resolution ◽

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Position Sensitive Detector ◽

Incident Neutron ◽

Sensitive Detector ◽

Energy Agency ◽

Position Sensitive ◽

Position Sensitive Photomultiplier Tube

The small-angle neutron scattering spectrometer SANS-U at the research reactor (JRR-3) of the Japan Atomic Energy Agency, Tokai, Japan, has been successfully upgraded. This major upgrade was undertaken in order to install a high-resolution position-sensitive detector consisting of a cross-wired position-sensitive photomultiplier tube combined with a ZnS/6LiF scintillator on the SANS-U spectrometer. Without changing the total length of the spectrometer, the aim was to extend the accessible low-Qlimit (Qis the magnitude of the scattering vector) and to shorten the measurement time by employing focusing small-angle neutron scattering (FSANS). By using both spherical MgF2biconcave lenses and the new high-resolution position-sensitive detector, the accessible low-Qlimit was extended from 2.5 × 10−3to 3.8 × 10−4 Å−1. As a result, SANS-U can continuously cover a wideQrange from 3.8 × 10−4to 0.35 Å−1with a wavelength of 7 Å. FSANS can be utilized not only to improve the accessible low-Qlimit but also to increase the intensity of incident neutrons passing through the sample in the conventionalQrange from 2.5 × 10−3to 0.35 Å−1. The use of `high-intensity' FSANS also allowed a reduction of the measuring time by approximately 1/3.16 by increasing the incident neutron intensity.

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New Polarized Small Angle Neutron Scattering capability at the High Flux Isotope Reactor

Physica B Condensed Matter ◽

10.1016/j.physb.2017.12.041 ◽

2018 ◽

Vol 551 ◽

pp. 492-495

Author(s):

T. Wang ◽

C.Y. Jiang ◽

T.O. Farmer ◽

L. Debeer-Schmitt ◽

J.F. Wenzel ◽

...

Keyword(s):

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

High Flux

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KWS-1: Small-angle scattering diffractometer

Journal of large-scale research facilities JLSRF ◽

10.17815/jlsrf-1-26 ◽

2015 ◽

Vol 1 ◽

Cited By ~ 36

Author(s):

Henrich Frielinghaus ◽

Artem Feoktystov ◽

Ida Berts ◽

Gaetano Mangiapia

Keyword(s):

High Resolution ◽

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Small Angle Scattering ◽

Angle Scattering

The KWS-1, which is operated by JCNS, Forschungszentrum Jülich, is a small-angle neutron scattering diffractometer dedicated to high resolution measurements.

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