Abstract
Design relations are given for double bent-crystal monochromators ensuring both spatial microfocusing and focusing in reciprocal space in powder diffraction. The choice of crystals for monochromators for microfocus stress scanning in steels is discussed. Design computations for an instrument at the Missouri University Research Reactor (MURR, thermal neutron flux 10 14 n/cm 2 s) with small-mosaic Cu(200) crystals are presented. The spot size can be brought down to 2.5 × 4 mm, with a peak flux at focus approaching 10 8 n/cm 2 s.
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