Applicatons of the single crystal diffractometer at HANARO based on a large-area curved two-dimensional position-sensitive detector

At HANARO, we developed and installed a neutron single crystal diffractometer based on a large-area curved two-dimensional position-sensitive detector (C-2DPSD) under collaboration of the Korea Atomic Energy Research Institute (KAERI) and Tohoku University. Last year, the diffractometer commissioning was completed with the development of the measurement methodology and the raw data processing software package, the 'Reciprocal Analyzer'. The diffractometer is equipped with a Ge(311) mosaic monochromator and two supermirror vacuum guide paths. Three different wavelengths can be easily selected by simply rotating the monochromator slab. The diffractometer has a customized room-temperature sample chamber and a 10K closed-cycle refrigerator-type low-temperature sample chamber to reduce the background from air scattering over the wide opening of the area detector. The calibration and corrections of the instrument are performed using a NaCl crystal. During the commissioning we carried out the experiments for various applications such as crystallographic and magnetic structure measurements, a crystallinity check on large crystals, a reciprocal space search and mapping, and a study on the composition or dopant content of a mixed crystal. The characteristics of the diffractometer, the measurement method, the calibration procedure and results, the raw data treatment and visualization, and several applications using the large C- 2DPSD-based diffractometer will be introduced in this presentation.