Spin Polarized Inelastic Neutron Spectrometer (SPINS)
SPINS is located on guide NG-5. SPINS operates in a number of different modes including conventional triple axis mode,
horizontally focusing mode, position-sensitive detector (PSD) and polarized beam mode. A vertically focusing
pyrolytic graphite (PG) monochromator produces beams with wavelengths from 2.42 to 5.84 Å. Energy resolution is in
the range of 0.02 to 1 meV, depending on incident wavelength and collimation.
A multi-crystal analyzer with 11 PG blades provides horizontal focussing capability. The focusing is fully
automated and controlled from the instrument computer. A two-dimensional position-sensitive detector (PSD) is
also available. With the multi-crystal analyzer, the PSD (20 cm × 25 cm in area) can simultaneously probe
scattering events with different momentum and energy transfer.
In the polarized beam mode of operation, supermirror transmission polarizers, consisting of a stack of single
crystal Si plates with Fe/Si supermirror coatings, are inserted in the incident and scattered beams.