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Dec 8 – 10, 2020 Online only
Online event
Europe/Berlin timezone

KWS-1 SANS instrument with polarization analysis

Dec 9, 2020, 2:30 PM
3h 30m
Online event

Online event

Speaker

Dr Artem Feoktystov (Forschungszentrum Jülich GmbH, JCNS at MLZ)

Description

The KWS-1 small-angle neutron scattering instrument is operated by JCNS at MLZ [1]. The instrument covers a q-range from 0.0007 to 0.5 Å⁻¹ with a selectable wavelength span from 4.7 to 20 Å. The maximum neutron flux on the sample is 1×10⁸ cm⁻² s⁻¹, making it one of the most intense SANS instruments in the world.

The instrument is equipped with transmission supermirror polarizer, adiabatic radio-frequency spin flipper and a recently obtained dedicated magnet and polarization analyzer. The three-channel V-cavity polarizer with Fe/Si coated supermirrors (m=3.6) has an average polarization >93% and is positioned in a custom designed changer of revolver type. The flipper provides a high flipping efficiency of more than 99.9% for all neutron wavelengths. A custom designed hexapod allows heavy loads and precise sample positioning in beam (also for grazing incidence SANS under an applied magnetic field). For the experiments with the polarization analysis a 3He analyzer is utilized. The new sample magnet allows close positioning of the ³He cell to the magnet. The magnet has two orthogonal horizontal accesses. For the maximum field of 3 T (parallel to the beam) the decay time, T1, of the ³He cell approximately 50 cm away from the center of the magnet constituted 90 hours. The maximum analyzed q is 0.06 Å⁻¹.

All instrument components are running under a flexible instrument control system (NICOS).

[1] A.Feoktystov, H.Frielinghaus, Z.Di, et al., J. Appl. Cryst., 48, 61 (2015)

Primary authors

Dr Artem Feoktystov (Forschungszentrum Jülich GmbH, JCNS at MLZ) Dr Zakaria Mahhouti (Forschungszentrum Jülich GmbH, JCNS at MLZ) Dr Henrich Frielinghaus (Forschungszentrum Jülich GmbH, JCNS at MLZ) Dr Marie-Sousai Appavou (Forschungszentrum Jülich GmbH, JCNS at MLZ) Dr Zahir Salhi (Forschungszentrum Jülich GmbH, JCNS at MLZ) Dr Earl Babcock (Forschungszentrum Jülich GmbH, JCNS at MLZ) Dr Alexander Ioffe (Forschungszentrum Jülich GmbH, JCNS at MLZ) Dr Stefan Mattauch (Forschungszentrum Jülich GmbH, JCNS at MLZ) Prof. Stephan Förster (Forschungszentrum Jülich GmbH, JCNS-1 and ICS-1) Prof. Thomas Brückel (Forschungszentrum Jülich GmbH, JCNS-2 and PGI-4, JARA-FIT)

Presentation materials