The D3C project: improvements and new fields of science

In order to improve the characteristics and extend the fields of science in vestigated on the present polarised hot-neutron diffractometer D3B of the I nstitut Laue Langevin (ILL), we propose the project D3C. Taking advantage o f the novel He-3 neutron spin filter presently available at the ILL, we can : (1) improve the peak count rates by optimising the monochromator irrespec tive of the spin selection process; (2) add polarisation analysis of the sc attered beam. By featuring the best polarised flux at short wavelength in c ombination with a 10 T cryomagnet for optimised flipping ratio measurements and uniaxial polarisation analysis, or a dedicated zero-held neutron polar imeter Cryopad for carrying out three-dimensional polarisation analysis exp eriments, D3C will be the most powerful and flexible neutron machine in the field. Among the new fields of science, there are determination of exotic magnetic structures and the precision measurements of antiferromagnetic for m factors in large (Q) over right arrow range. (C) 1999 Elsevier Science B. V. All rights reserved.