D. Bellmann et al., IMPROVEMENT OF THE DOUBLE-CRYSTAL DIFFRACTOMETER AT THE GEESTHACHT NEUTRON FACILITY (GENF) BY MEANS OF PERFECT CHANNEL-CUT SILICON-CRYSTALS, Physica. B, Condensed matter, 241, 1997, pp. 71-73
High resolution small-angle neutron scattering (HR-SANS) investigation
s have been performed by means of the double crystal diffractometer (D
CD) at the Geesthacht Neutron Facility (GeNF). The two single perfect
silicon crystals of the instrument have recently been replaced by chan
nel-cut ones in the non-dispersive (1, - 1) setting to reduce the inte
nsity of the rocking curve in its wings by three-fold reflections. The
reby a very strong decrease of this intensity has been achieved, where
by its former dependence on the scattering Vector q of q(-2) has been
changed to q(-6). This improvement of the rocking curve leading to a r
eduction of the inherent background is presented, and a new perspectiv
e for future HR-SANS investigations is pointed out. (C) 1998 Elsevier
Science B.V. All rights reserved.