Instrument description
IN5 is a general purpose direct geometry Time of Flight (ToF) spectrometer. It is used to study low-energy transfer processes as a function of momentum transfer. Typically this instrument is used for measurements in the small energy and momentum transfer region with values of the order of δE/E = 1 % for the energy resolution (e.g. quasi-elastic scattering in solids, liquids, molecular crystals and inelastic scattering with small energy transfers in the order of magnitude 0.1 - 250 meV). It offers total flexibility of wavelength selection and chopper speed which permits considerable optimisation of the energy range, energy resolution, momentum-transfer range and countrate.
Primary spectrometer:
the chopper system provides an extremely well defined resolution function which remains nearly gaussian (counter-rotating disks) down to 1/10 000 of its height.
Secondary spectrometer:
it consists in an large cylindrical array of pixelated position sensitive detector (PSD) mounted inside a vacuum time-of-flight chamber 4m from the sample. PSDs cover a large gapless detection surface (30m2) with a spatial resolution comparable to triple-axis instruments. With the new detector, the instrument has a large solid-angle for powder and amorphous systems experiments and is fully equipped for single-crystal spectroscopy.
Sample area:
a large sample chamber (max diameter = 80cm, depth ~ 130cm) allows hosting the broad range of IN5 sample environments but also user-designed equipments (contact instrument responsibles before). The non-magnetic material surrounding the sample allows the use of either high magnetic field (limited to 2.5T at the moment it is foreseen to purchase a specific magnet for higher fields - equal or above 10T) or neutron polarisation devices (still to come).
