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D3 - The Spin Polarised Hot Neutron Beam Facility

It is a very versatile diffractometer for magnetic structure analysis. It offers several set-ups:

  • a high field set-up for 1D polarimetry up to 10 Tesla ;
  • a zero-field set-up for spherical neutron polarimetry with CRYOPAD ;
  • a non-polarized set-up for experiments requiring both short wavelengths and high magnetic fields.

Recently a "liquids setup" has been added, to use the polarised neutrons to measure separately (and subtract) the spin-incoherent background.

Layout D3 2017.png

Instrument layout

Low-field setup: this option implement a third-generation CRYOPAD (CRYOgenic Polarisation Analysis Device) for precision measurement of neutron spin rotations occurring in the scattering process.

High field setup: Here, D3 is equiped with a 10 Tesla cryomagnet with a wide opening angle and a lifting detector. The neutron beam is polarised vertically. Large portions of the reciprocal space can be explored due to the relatively short wavelengths.

Zero field setup: D3 is equiped with CRYOPAD and a 3He spin filter (DECPOL). This makes it possible to monitor separately the polarisations of the incident and scattered beams, in 3 dimensions.

Applications

High field configuration

  • Magnetic form factors (reflecting the state of the magnetic ions);
    Magnetisation distributions

Zero-field configuration

  • Non-collinear magnetic structures ;
    Antiferromagnetic form factors ;
    Spherical polarimetry

Liquids configuration

  • Separation of coherent and spin-incoherent scattering in hydrogenous liquids

Non-polarized beam with high magnetic field