Study on Resolution and Pole Figure Window of Neutron Texture Diffractometer at China Advanced Research Reactor

To evaluate the resolution and pole figure window of neutron texture diffractometer at China Advanced Research Reactor (CARR), the expressions of resolution and pole figure window were concluded based on the error analysis of diffraction geometry in reciprocal space and then applied to CARR neutron texture diffractometer. The results show that the pole figure window approximates to elongated rectangle. Its β resolution is very high and α resolution varies largely with diffraction angle. For specific diffraction angle, α resolution is fixed for ³He tube detector. While, for two-dimensional position sensitive detector it can be adjusted according to the materials and texture distribution by vertically dividing the detector into pieces.