The paper introduced the effect and principium of Sagtital focusing double crystal monochromator ,and described measurement for positon of facula from Sagtital focusing double crystal monochromator.

Finite element analysis of diffracting surface of sagittally focusing crystal in double-crystal monochromator;

Analysis of the focusing error of sagittally focusing double-crystal monochromator;

The principle of dynamically bending of the crystal in a sagittal focusing monochramator by flexural hinge-based bender was presented and the geometric parameters of bender and crystal were optimized.

This paper briefly introduces the sagittal focusing and monochromic principle about the beam between 5～265 KeV?Sagittal focusing monochromic principle about beam is based on Bragg law (2dsinθ=nλ),and the monochromic beam is abtained by changing Bragg angle θ.

Sagittal focusing monochromatizing principle about beam is based on Bragg law (2dsinθ=nλ) and the monochromic beam is obtained by changing Bragg angle θ.

In order to improve the incident neutron fluence rate at the sample position to allow both high-resolution and small sampling volume measurements,simulation and optimization on the vertical focusing monochromator,a key component of the neutron diffractometer for strain measurement to be built at China Advanced Research Reactor(CARR) was carried out using the MCSTAS code.

The vertically focused monochromator of the neutron powder diffractometer was simulated using Monte-Carlo method.

Vertically focused monochromator technique is an effective tool of increasing neutron intensity at sample position.