The concept of the new small-angle scattering instrument SANS-1 at the FRM-II

The new small-angle scattering instrument SANS-1, a project of the Technische Universität München, the Universität Göttingen, the GKSS Research Centre and other collaboration partners is currently set up at the new neutron source Heinz Maier-Leibnitz (FRM-II) in Garching near Munich. This contribution describes the concept and the technical features of the instrument. The first task was to implement the instrument concept within the suite of instruments in the neutron guide hall of the FRM-II. Monte Carlo simulations were performed to optimise the neutron guide with respect to the available space for the instrument and the possibility to include components later in a flexible way. The advantage of the installed vertical S-shaped neutron guide will be compared to a standard single-curved neutron guide. A sharp wavelength cut off and a more homogeneous divergence distribution with higher intensity for neutrons with small wavelengths are important improvements.