scholarly journals Simulations of foil-based spin-echo (modulated) small-angle neutron scattering with a sample using McStas

2021 ◽  
Vol 54 (1) ◽  
pp. 195-202
Author(s):  
Wim G. Bouwman ◽  
Erik B. Knudsen ◽  
Linda Udby ◽  
Peter Willendrup
Keyword(s):  
Magnetic Field ◽  
Elastic Scattering ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Spin Echo ◽  
Transmitted Beam ◽  
Further Development ◽  
Theory And Experiments ◽  
Good Agreement

For the further development of spin-echo techniques to label elastic scattering it is necessary to perform simulations of the Larmor precession of neutron spins in a magnetic field. The details of some of these techniques as implemented at the reactor in Delft are simulated. First, the workings of the magnetized foil flipper are simulated. A full virtual spin-echo small-angle neutron scattering instrument is built and tested without and with a realistic scattering sample. It is essential for these simulations to have a simulated sample that also describes the transmitted beam of unscattered neutrons, which usually is not implemented for the simulation of conventional small-angle neutron scattering (SANS) instruments. Finally, the workings of a spin-echo modulated small-angle neutron scattering (SEMSANS) instrument are simulated. The simulations are in good agreement with theory and experiments. This setup can be extended to include realistic magnetic field distributions to fully predict the features of future Larmor labelling elastic-scattering instruments. Configurations can now be simulated for more complicated combinations of SANS with SEMSANS.

An analysis of magnetic field inhomogeneities in a spin-echo small-angle neutron scattering instrument

2000 ◽  
Vol 276-278 ◽  
pp. 136-137 ◽  
Author(s):  
Oktay Uca ◽  
Wim G Bouwman ◽  
Wicher H Kraan ◽  
M.Theo Rekveldt
Keyword(s):  
Magnetic Field ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Spin Echo

A PROTOTYPE OF SPIN-ECHO SMALL ANGLE NEUTRON SCATTERING WITH TIME GRADIENT MAGNETIC FIELDS CONSTRUCTING AT THE IBR-2 REACTOR.

2019 ◽  
pp. 52-57
Author(s):  
V.V. Sadilov ◽  
V.I. Bodnarchuk ◽  
M.V. Avdeev
Keyword(s):  
Magnetic Fields ◽  
Neutron Scattering ◽  
Present Article ◽  
Experimental Verification ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Spin Echo ◽  
Experimental Setup ◽  
Special Approach ◽  
Further Development

In the present article, we consider the results of an experimental verification of the elements of the spin-echo setup based on time gradient magnetic fields. The work confirmed the efficiency of the methodology and identified the main problems requiring a special approach for further development and implementation as an experimental setup.

scholarly journals Feasibility of Probing the Filler Restructuring in Magnetoactive Elastomers by Ultra-Small-Angle Neutron Scattering

2021 ◽  
Vol 11 (10) ◽  
pp. 4470
Author(s):  
Inna A. Belyaeva ◽  
Jürgen Klepp ◽  
Hartmut Lemmel ◽  
Mikhail Shamonin
Keyword(s):  
Magnetic Field ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Iron Particles ◽  
Filler Particles ◽  
The Magnetic Field ◽  
Magnetoactive Elastomer

Ultra-small-angle neutron scattering (USANS) experiments are reported on isotropic magnetoactive elastomer (MAE) samples with different concentrations of micrometer-sized iron particles in the presence of an in-plane magnetic field up to 350 mT. The effect of the magnetic field on the scattering curves is observed in the scattering vector range between 2.5 × 10−5 and 1.85 × 10−4 Å−1. It is found that the neutron scattering depends on the magnetization history (hysteresis). The relation of the observed changes to the magnetic-field-induced restructuring of the filler particles is discussed. The perspectives of employing USANS for investigations of the internal microstructure and its changes in magnetic field are considered.

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.

Application of spin-echo small-angle neutron scattering to study the structure of charged colloids

2005 ◽  
Vol 356 (1-4) ◽  
pp. 218-222 ◽  
Author(s):  
Timofey V. Kruglov ◽  
Wim G. Bouwman ◽  
Ignatz M. de Schepper ◽  
Theo M. Rekveldt
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Spin Echo ◽  
Charged Colloids
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