A new thermal neutron spectrometer/diffractometer for polarization analysis (SV30) at the research reactor FRJ-2

Abstract.

A new thermal neutron spectrometer for polarization analysis is under construction at the Research Center Jülich. The spectrometer was conceived to be a multiple purpose instrument, which can be used both as a triple-axis spectrometer and a diffractometer for applications of polarized neutron scattering in triple-axis spectroscopy, crystallographic investigations and measurements of magnetic diffuse scattering. Therefore, the spectrometer is equipped with two exchangeable detector modules that carry an analyzer unit with a single detector and an image plate neutron detector. Two double focusing monochromators (Cu(200) and PG(002)) allow for a high flux of neutrons with an energy up to 125 meV at the sample position. The use of ³He filters as a polarizer and an analyzer together with a large-area image plate neutron detector makes possible polarization analysis of high-energy neutrons over a large solid angle of 60°× 60°.