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.

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.