IMPROVEMENTS TO THE POLARIZED-NEUTRON REFLECTOMETER CRISP

The reflectometer CRISP at ISIS is being upgraded to expand its capabi lities in the polarised-beam mode. The polarisers are being replaced b y Fe-Co-V:TiNx supermirrors to give a higher incident flux and a two-t imes larger dynamic range. The flippers have also been redesigned to g ive higher flipping efficiencies over larger beam sizes and wavelength ranges. The improvements are described and compared to the current in strument performance. (C) 1998 Elsevier Science B.V. All rights reserv ed.