Abstract
Fenghuang has been upgraded to be the first neutron powder diffractometer at the China Mianyang Research Reactor (CMRR) dedicated to research on the microstructure of materials. It was firstly built in 2005 at the Swimming Pool Research Reactor-300 (SPRR-300) in Mianyang, and then moved to CMRR in 2013. Through the combination of a horizontally focusing neutron guide and a vertically focusing monochromator, the neutron flux at the sample position is up to 2.84 × 106 n s−1cm−2. The resolution of the diffractometer can be adjusted by a horizontal slit for different sample. The superposition scan mode enables each detector to measure the complete diffraction pattern and simplifies the correction of the efficiency of the counting channels. This diffractometer is equipped with temperature and pressure devices, and can be used for research at ambient and extreme conditions.
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