Polarization analysis for the 2D position-sensitive detector of the HADAS reflectometer in Julich

A neutron reflectometer with polarization analysis is being built on the ba sis of the HADAS spectrometer in the neutron guide hall at the research rea ctor FRJ-2 (DIDO) in Julich. The new instrument is optimized for reflectivi ty and diffuse scattering measurements under grazing incidence on layered m agnetic structures with thicknesses in the nm range. In order to measure di ffuse scattering with polarization analysis, the 2D position-sensitive dete ctor has been equipped with a polarization analyser that consists of a stac k of supermirrors parallel to the scattering plane. First tests have reveal ed that the resolution of the instrument is not reduced by the polarization analyser. A flipping ratio of 20 has been achieved already during the firs t experiment. (C) 2001 Elsevier Science B.V. All rights reserved.