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17–19 Sept 2018
Fakultät für Maschinenwesen der Technischen Universität München
Europe/Berlin timezone

The upgraded neutron grating interferometer at ANTARES – Design, Performance and Applications –

17 Sept 2018, 11:15
15m
MW 2001 (Fakultät für Maschinenwesen)

MW 2001

Fakultät für Maschinenwesen

Talk P1 Instrumentation and methods Parallel session 1

Speaker

Tobias Neuwirth (Heinz Maier-Leibnitz Zentrum, TU München)

Description

Neutron grating interferometry (nGI) is a relatively new neutron imaging technique, which simultaneously delivers information about the transmission (TI), phase shift (DPC) and the scattering (DFI) inside a sample [1].
In particular the DFI has generated high interest, due to its ultra-small-angle neutron scattering (USANS) contrast mechanism, allowing to indirectly resolve structures not directly resolvable by an imaging instrument [2].
Recently there have been strong efforts to use nGI and particularly the DFI as tools for quantitative measurements of structures in materials.
A prerequisite for such measurements is a high signal-to-noise-ratio. For the DFI it has been shown that the main reasons for high noise are (i) low DFI signal and (ii) low visibility [3]. Hence a high visibility is needed for quantitative measurements.
We will present the upgraded nGI setup at the ANTARES beamline at FRM II, which has been heavily redesigned compared to its precursor [4]. The redesign allowed to optimize the source and analyzer gratings. With these changes we have achieved a visibility of 75% over the whole detector area (76mm x 76mm) at the design wavelength of 4 Å. This visibility is close to the theoretical limit imposed by the spatial coherence generated by the G0 grating.

[1] C. Grünzweig, PhD thesis (2009)
[2] M. Strobl et al., 101, 123902 (2008)
[3] R. Harti et al., Review of Scientific Instruments 88, 103704 (2017)
[4] T. Reimann et al., J. Appl. Cryst. 49, 1488-1500 (2016)

Primary authors

Tobias Neuwirth (Heinz Maier-Leibnitz Zentrum, TU München) Alex Gustschin (Chair of Biomedical Physics, Department of Physics and Munich School of Bioengineering, TU München) Alexander Backs Prof. Franz Pfeiffer (Chair of Biomedical Physics, Department of Physics and Munich School of Bioengineering, TU München) Prof. Peter Böni (Physikdepartment E21, TU München) Michael Schulz (Heinz Maier-Leibnitz Zentrum, TU München)

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