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IN22 CRG - Thermal neutron three-axis spectrometer with polarization analysis

IN22 - CRG - Thermal neutron three-axis spectrometer with polarization analysis

Thermal neutron three-axis spectrometer

IN22 is a CRG instrument operated at the ILL by the CEA-Grenoble DRFMC/SPSMS. It is a thermal neutron three-axis spectrometer especially designed for inelastic neutron scattering under high magnetic fields. It is equipped for both longitudinal and spherical polarisation analysis. The machine is optimized to work with neutrons of incident energies in the range between 5 and 100 meV, thanks to H25 a m=2 supermirror guide.

Applications

  • Study of magnetic and structural excitation spectra on single crystals with neutrons of incident energies in the range 5-100 meV. Vertical magnetic field up to 15T, horizontal magnetic field 4T and pressure up to 1 GPa options are available.
  • Longitudinal and spherical polarimetry of inelastic contributions
  • Measurements of inelastic nuclear-magnetic interference terms.
  • Polarized neutron inelastic scattering under high magnetic field (up to 12 T).
  • Measurements of magnetic and structural excitation lifetimes with Neutron Resonance Spin echo (NRSE) option.
  • Experiments requiring a good resolution in wave vector and a low intrinsic neutron background.
  • Study of magnetic phase diagram with pulsed magnetic filed up to 40T.

Instrument layout

Here the instrument is shown in its classical setting for magnetic studies. The neutron beam is polarised and the sample is placed in the high magnetic field of a cryomagnet.

A general view of the instrument

IN22 may adopt several instrument setting (high-magnetic fields, spherical polarisation analysis, resonance spin echo, etc.) It is shown here in a classical three axis configuration (TAS).

IN22 configured for spherical polarisation analysis

IN22 is shown here equiped with a neutron resonance spin echo (NRSE) option. This is especially valuable for the measurement of low energy excitations and their lifetime.

High-magnetic field configuration

IN22 is shown here in a polarised neutron configuration and equiped with a 12 Tesla vertical cryomagnet. The
housing of the polarising monochromator (Heusler (111)) is beyond the right side of the frame.

Double focusing analyser

The photo shows Louis-Pierre Regnault looking at the focusing analyser of IN22. The horizontal focalisation is adjustable, the vertical one is fixed. This analyser is made of a set of carefully aligned Heusler(111) single crystals.