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

MARIA – The high-intensity polarized neutron reflectometer of JCNS

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

Online event

Speaker

Alexandros Koutsioumpas (JCNS)

Description

The high-intensity reflectometer MARIA of JCNS is installed in the neutron guide hall of the FRM II reactor and is using a velocity selector (4.5Å<λ¬<40Å) as a primary wavelength filter with 10% resolution. In combination with a Fermi-Chopper the wavelength resolution can be increased to 1% or 3%. The beam is optionally polarized by a double-reflecting super mirror and the elliptically focusing neutron guide increases the flux at the sample position thus reducing the required sample size or measuring time. A flexible Hexapod, as sample table, can be equipped with an electromagnet (up to 1.1T) or a cryomagnet (up to 5T), a UHV-chamber (10−10 mbar range) for the measurement of Oxide MBE samples and also with soft matter solid/liquid interface cells connected to a “sample robot” for automatic solvent contrast. Together with the 400 x 400 mm² position sensitive detector and a ³He polarization spin filter based on Spin-Exchange Optical Pumping, the instrument is well equipped for investigating specular reflectivity and off-specular scattering from magnetic layered structures. Furthermore the GISANS option can be used to investigate lateral correlations in the nm range.
MARIA is a state of the art reflectometer that gives the opportunity to investigate reflectivity in a dynamic range of up to 7-8 orders of magnitude including off-specular scattering and GISANS. Furthermore the high intensity allows for kinetic measurements down to a few seconds over a dynamic range of 4 orders.

Primary authors

Stefan Mattauch (FZ-Juelich) Alexandros Koutsioumpas (JCNS) Sabine Pütter (Jülich Centre for Neutron Science JCNS, Outstation at MLZ, Forschungszentrum Jülich GmbH) Kirill Zhernenkov (Jülich Forschungszentrum GmbH) Earl Babcock zahir salhi (JCNS) Alexander Ioffe (JCNS) Thomas Brückel (Forschungszentrum Jülich GmbH)

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