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D3 The Spin Polarised Hot Neutron Beam Facility

D3 - The Spin Polarised Hot Neutron Beam Facility

D3 is a highly versatile diffractometer designed for magnetic structure analysis. It offers several setups:

  • a high-field setup for 1D polarimetry up to 10 Tesla;
  • a zero-field setup for spherical neutron polarimetry using CRYOPAD;
  • a non-polarized setup for experiments requiring both short wavelengths and high magnetic fields;
  • a recently added "liquids setup" that uses polarized neutrons to separately measure (and subtract) spin-incoherent background.
Layout D3 2017.png

Instrument layout

Gallery D3 01

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