The imaging of large area neutron sources into millimeter-size spots by focusing with two curved perfect crystals is examined. In the parallel (+,-) setting large demagnifications can be achieved only with crystals in strongly asymmetric reflection. The most promising configurations appear to be those with crystals in antiparallel (+,+) setting. The beam intensities for the parallel and antiparallel settings of bent crystals are comparable, the reflection efficiency being enhanced by the reflectivity curve broadening. The instrument Q-resolution can be kept reasonably good in a limited range by phase space focusing. Results of neutron optics computations are presented for a diffractometer for stress scanning measurements and for a small-angle scattering instrument with long neutron paths.

Date Published: 23 November 1992
PDF: 9 pages
Proc. SPIE 1738, Neutron Optical Devices and Applications, (23 November 1992); doi: 10.1117/12.130652

Published in SPIE Proceedings Vol. 1738:
Neutron Optical Devices and Applications
Charles F. Majkrzak; James L. Wood, Editor(s)