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