SEMSANS and Dark field imaging

A SESANS instrument with different fields in the first and second precession arm will create a lateral modulation of the neutron intensity at a position sensitive detector [1,2]. This concept opens up several interesting possibilities for neutron scattering:

1.     Since all the neutron spin manipulation is performed before the sample, it is possible to study magnetic samples with SESANS or to have a magnetic sample environment.

2.     The modulation device can be built in into a SANS instrument to measure simultaneous SANS and SESANS to cover many adjacent orders of length scale [3].

3.     By combining this with imaging one can do dark field imaging without gratings. The modulation by the magnetic fields works already as a grating [4].

Key publications

1.     Combined SANS–SESANS, from 1 nm to 0.1 mm in one instrument
W.G. Bouwman, C.P. Duif, J. Plomp, A. Wiedenmann, R. Gähler
Physica B 406, 2357-2360 (2011)
http://dx.doi.org/10.1016/j.physb.2010.11.069

2.     TOF-SEMSANS—Time-of-flight spin-echo modulated small-angle neutron scattering
M. Strobl, A.S. Tremsin, A. Hilger, F. Wieder, N. Kardjilov, I. Manke, W.G. Bouwman, J. Plomp
J. of Appl. Physics 112 014503 (2012)
dx.doi.org/10.1063/1.4730775

3.     Feasibility and Applications of the Spin-Echo Modulation Option for Small Angle Neutron Scattering Instrument at the European Spallation Source
A. Kusmin, W.G. Bouwman, A.A. van Well, C. Pappas
Nucl. Instr. and Meth. A 856 119-132 (2017)
http://dx.doi.org/10.1016/j.nima.2016.12.013

4.     Quantitative Neutron Dark-field Imaging through Spin-Echo Interferometry
M. Strobl, M. Sales, J. Plomp, W.G. Bouwman, A.S. Tremsin, A. Kaestner, C.P. Pappas, K. Habicht
Scientific Reports 5 16576 (2015)
http://dx.doi.org/10.1038/srep16576