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Small angle neutron scattering
The new small angle scattering instrument SANS-1, a joint project of TUM and Hereon (former HZG) is in regular user service . SANS-1 is located at the end of neutron guide NL4a in the Neutron Guide Hall West.
SANS-1 is a standard pinhole SANS instrument with both 20 m collimation distance and 20 m sample detector distance, respectively. SANS-1 has been optimised by Monte-Carlo simulations to fit the restrictions in both available space and optimal usage of the provided neutron beam [2,3]. A vertical S-shaped neutron guide with extreme suppression of fast background neutrons is optimised for complementary wavelength packages, followed by the selector tower with two selectors for high and low resolution, respectively. Adjacent to the selector tower, a collimation system with four parallel horizontal tracks provides vast flexibility: The first track is occupied by a neutron guide system, the second track carries the collimation system with additional background apertures on track three. One track remains empty for various future applications such as focussing lenses or a longitudinal spin echo option. Two Fe/Si transmission polarisers have been optimised to cover the whole wavelength band from 4.5–30 Å. A TISANE double disk chopper is available which allows to perform kinetic neutron scattering experiments in the µs regime.
The acentric mounting of the detector tube with around 2.4 m inner diameter allows to use a primary detector of 1 × 1 m2 with lateral movement of more than 0.5 m, significantly expanding the accessible Q-range to around Qmax ≈ 1 Å-1. The primary detector is made up of an array of 128 position sensitive tubes to provide 8 mm × 8 mm spatial resolution. A second high resolution (3 mm) detector with an area of 0.5 × 0.5 m2 is used for higher distances.
A thorough characterization of the key features of SANS-1 at MLZ is given in . Measurements of the neutron beam profile, divergence and flux are given for various positions along the instrument including the sample position, and agree well with Monte Carlo simulations of SANS-1 using the program McStas [2,3]. Secondly, the polarization option of SANS-1 is characterized for a broad wavelength band. A key feature of SANS-1 is the large accessible Q-range facilitated by the sideways movement of the detector. Particular attention is hence paid to the effects that arise due to large scattering angles on the detector where a standard cos3 solid angle correction is no longer applicable. Finally the performance of the instrument is characterized by a set of standard samples.
 Mühlbauer, S. et al., NIMA 832, 297-305 (2016).
 Gilles, R. et al., Physica B 385-386, 1174-1176 (2006).
 Gilles, R. et al., J. Appl. Cryst. 40, s428-s432 (2007).
The instrument SANS-1 is dedicated to study the structure of materials on length scales of 10 to 3000 Å. With its polarised beam option, the flexible sample goniometer, the wide non-magnetic sample space and the specialised set of sample environment, SANS-1 is particularly adapted for the needs of materials research and magnetism. The precise sample goniometer carries various loads up to 750 kg and fulfills the rising demand on diffraction experiments at low scattering angles, for instance for studies of superconducting vortex lattices and other large magnetically ordered systems.
Dr. André Heinemann
Phone: +49 (0)89 289-14534
Dr. Sebastian Mühlbauer
Phone: +49 (0)89 289-10784
Phone: +49 (0)89 158860-552
Find the latest publications regarding SANS-1 in our publication database iMPULSE:
Heinz Maier-Leibnitz Zentrum. (2015). SANS-1: Small angle neutron scattering. Journal of large-scale research facilities, 1, A10. http://dx.doi.org/10.17815/jlsrf-1-32
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