IN5 - Disk chopper time-of-flight spectrometer

IN5 Instrument layout — Instrument layout
This shows how the 6 choppers are distributed in the primary spectrometer and how the huge detector bench is designed.

IN5B is a high precision 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 about 1 % for the energy resolution (e.g. quasi-elastic scattering in solids, liquids, molecular crystals and inelastic scattering with small energy transfers in the range 10 µeV - 100 meV).

Disk chopper time-of-flight spectrometer

Applications

Local and long-range diffusion in disordered systems such as liquids, molecular crystals, amorphous solids (superionic glasses, orientational glasses, spin glasses), polymers, hydrogen-metal systems, ionic conductors
Dynamics of ’soft matter’, including gels, proteins and biological membranes
Dynamics of quantum liquids
Rotational tunnelling in molecular crystals
Crystal field splitting
Spin dynamics in high-TC superconductors
Critical scattering phenomena in dense gases and solids

Instrument 3D layout

A cut of IN5B in a vertical plane along the beam axis

(1) Main access gate
(2) Choppers radiological protection
(3) Monochromator choppers
(4) Frame overlap and contaminant order choppers
(5) Focusing guide
(6) Sample environment lift
(7) Sample chamber
(8) Position sensitive detectors
(9) Background shielding
(10) Background shielding frame
(11) Time-of-flight chamber
(12) Instrument recess

Note that the instrument is non-magnetic and has large sample chamber.