Energy-resolved small-angle neutron scattering from steel

2017 ◽  
Vol 50 (2) ◽  
pp. 334-339 ◽  
Author(s):  
Yojiro Oba ◽  
Satoshi Morooka ◽  
Kazuki Ohishi ◽  
Jun-ichi Suzuki ◽  
Shin-ichi Takata ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Experimental Technique ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Recent Progress ◽  
Neutron Sources ◽  
Analysis Technique ◽  
Neutron Attenuation ◽  
Pulsed Neutron

Recent progress of pulsed neutron sources has enabled energy-resolved analysis of neutron attenuation spectra, which include information on neutron scattering. In this study, a new analysis technique for small-angle neutron scattering (SANS) is demonstrated. A clear difference is observed in the neutron attenuation spectra between steels with different nanostructures; this difference can be understood as arising from attenuation due to SANS. The neutron attenuation spectra calculated from the corresponding SANS profiles agree well with the experimentally observed attenuation spectra. This result indicates that measurement of neutron attenuation spectra may enable the development of a novel experimental technique,i.e.energy-resolved SANS.

Comparison of Small-Angle Neutron Scattering of δ' Precipitation in an Al–Li Alloy at a High-Flux Reactor and at a Pulsed-Neutron Source

1997 ◽  
Vol 30 (5) ◽  
pp. 602-606 ◽  
Author(s):  
G. Albertini ◽  
F. Carsughi ◽  
R. Coppola ◽  
R. K. Heenan ◽  
M. Stefanon
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Size Distribution Function ◽  
Data Sets ◽  
Flux Reactor ◽  
Average Size ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source ◽  
Good Agreement

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.

scholarly journals Neutron Larmor diffraction on powder samples

2020 ◽  
Vol 53 (1) ◽  
pp. 88-98 ◽  
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.

Conceptual design of the grazing-incidence focusing small-angle neutron scattering (gif-SANS) instrument at CPHS

2021 ◽  
pp. 1-5
Author(s):  
Huarui Wu ◽  
Weihang Hong ◽  
Yao Zhang ◽  
Pulin Bai ◽  
Wenbo Mo ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Conceptual Design ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
High Performance ◽  
Grazing Incidence ◽  
The Other ◽  
Tsinghua University ◽  
Neutron Sources ◽  
Sans Instrument

Developing small-angle neutron scattering techniques at compact accelerator-driven neutron sources (CANS) is of great importance for expanding the user community and advancing CANS capability. At the Compact Pulsed Hadron Source (CPHS) at Tsinghua University, neutron-focusing mirrors are under intensive research to address the challenge. A grazing-incidence focusing SANS (gif-SANS) project is initialized. It employs a nested supermirror assembly with a large collecting area to achieve ⩾ 10 5 n/s neutron intensity at Q min ⩽ 0.007 Å − 1 . It will equip two detectors, one being a 3He detector for normal Q-range measurements, and the other being a high-resolution detector for extending the Q min down to 10 − 3 Å − 1 . In this work, we present the conceptual design of the gif-SANS at CPHS. Such a scheme is conducive to enable high-performance SANS measurements at CANS.

scholarly journals Soft Matter Sample Environments for Time-Resolved Small Angle Neutron Scattering Experiments: A Review

2021 ◽  
Vol 11 (12) ◽  
pp. 5566
Author(s):  
Volker S. Urban ◽  
William T. Heller ◽  
John Katsaras ◽  
Wim Bras
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
High Intensity ◽  
Small Angle Neutron Scattering ◽  
Soft Matter ◽  
Condensed Matter ◽  
Large Body ◽  
Soft Condensed Matter ◽  
Time Resolved ◽  
Neutron Sources

With the promise of new, more powerful neutron sources in the future, the possibilities for time-resolved neutron scattering experiments will improve and are bound to gain in interest. While there is already a large body of work on the accurate control of temperature, pressure, and magnetic fields for static experiments, this field is less well developed for time-resolved experiments on soft condensed matter and biomaterials. We present here an overview of different sample environments and technique combinations that have been developed so far and which might inspire further developments so that one can take full advantage of both the existing facilities as well as the possibilities that future high intensity neutron sources will offer.

scholarly journals Advanced Small-Angle Scattering Instrument Available in the Tokyo Area. Time-Of-Flight, Small-Angle Neutron Scattering Developed on the iMATERIA Diffractometer at the High Intensity Pulsed Neutron Source J-PARC

2020 ◽  
Vol 4 (4) ◽  
pp. 42
Author(s):  
Satoshi Koizumi ◽  
Yohei Noda ◽  
Tomoki Maeda ◽  
Takumi Inada ◽  
Satoru Ueda ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
High Intensity ◽  
Small Angle Neutron Scattering ◽  
Time Of Flight ◽  
Small Angle Scattering ◽  
Proton Accelerator ◽  
Static Structure Factor ◽  
Angle Scattering ◽  
Pulsed Neutron

A method of time-of-flight, small-angle neutron scattering (TOF-SANS) has been developed based on the iMATERIA powder diffractometer at BL20, of the Materials and Life Sciences Facility (MLF) at the high-intensity proton accelerator (J-PARC). A large-area detector for SANS, which is composed of triple-layered 3He tube detectors, has a hole at its center in order to release a direct beam behind and to detect ultra-small-angle scattering. As a result, the pulsed-neutron TOF method enables us to perform multiscale observations covering 0.003 < q (Å−1) < 40 (qmax/qmix = 1.3 × 104) and to determine the static structure factor S(q) and/or form factor P(q) under real-time and in-situ conditions. Our challenge, using unique sample accessories of a super-conducting magnet and polarized neutron, is dynamic nuclear polarization (DNP) for contrast variation, especially for industrial use. To reinforce conventional SANS measurements with powder materials, grazing-incidence small-angle neutron scattering (GISANS) or reflectivity is also available on the iMATERIA instrument.

Polarization analysis for small-angle neutron scattering with a 3He spin filter at a pulsed neutron source

2021 ◽  
Vol 54 (2) ◽  
pp. 548-556
Author(s):  
Takuya Okudaira ◽  
Yuki Ueda ◽  
Kosuke Hiroi ◽  
Ryuhei Motokawa ◽  
Yasuhiro Inamura ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Neutron Source ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Incoherent Scattering ◽  
Polarization Analysis ◽  
Spin Filter ◽  
Scattering Intensity ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

Neutron polarization analysis (NPA) for small-angle neutron scattering (SANS) experiments using a pulsed neutron source was successfully achieved by applying a 3He spin filter as a spin analyzer for the neutrons scattered from the sample. The cell of the 3He spin filter gives a weak small-angle scattering intensity (background) and covers a sufficient solid angle for performing SANS experiments. The relaxation time of the 3He polarization is sufficient for continuous use for approximately 2 days, thus reaching the typical duration required for a complete set of SANS experiments. Although accurate evaluation of the incoherent neutron scattering, which is predominantly attributable to the extremely large incoherent scattering cross section of hydrogen atoms in samples, is difficult using calculations based on the sample elemental composition, the developed NPA approach with consideration of the influence of multiple neutron scattering enabled reliable decomposition of the SANS intensity distribution into the coherent and incoherent scattering components. To date, NPA has not been well established as a standard technique for SANS experiments at pulsed neutron sources such as the Japan Proton Accelerator Research Complex (J-PARC) and the US Spallation Neutron Source. It is anticipated that this work will contribute significantly to the accurate determination of the coherent neutron scattering component for scatterers in various types of organic sample systems in SANS experiments at J-PARC, particularly for systems involving competition between the coherent and incoherent scattering intensity.

scholarly journals Development of new small-angle neutron scattering geometry with ring-shaped collimated beam for compact neutron source

2020 ◽  
Vol 231 ◽  
pp. 05001
Author(s):  
Fumiaki Funama ◽  
Yuya Adachi ◽  
Seiji Tasaki ◽  
Yutaka Abe
Keyword(s):  
Neutron Scattering ◽  
Neutron Source ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Experimental Result ◽  
Center Line ◽  
Neutron Sources ◽  
Ring Center ◽  
Collimated Beam ◽  
Scattered Neutrons

Small-angle neutron scattering (SANS) is an important tool to investigate material properties in nanometer to micrometer scale. The opportunity to conduct SANS experiments is, however, limited because of the low number of available SANS beam lines. Compact neutron sources are expected to play a significant role to increase neutron scattering facilities including SANS beam lines. The problem is that the flux of compact neutron sources can be very low, which makes it difficult to measure scattered neutrons from a sample. A SANS geometry with ring-shaped collimated beam (r-SANS) is developed to conduct SANS experiments at very low flux neutron sources. By using ring-shaped collimated neutrons to hit a large sample, the scattered neutron flux becomes high on the ring center line because the scattered neutrons with each scattered angle overlaps on each point of the ring center line. By setting a 3He point detector on the center line and shielding the surrounding of the small detection area well, high signal to noise ratio experiments are possible. In this paper, we show the concept of this new geometry and a preliminary experimental result of a glassy carbon sample taken with the r-SANS geometry constructed at Kyoto University proton Accelerator Neutron Source (KUANS).

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