Speaker
Description
The High-Pressure Neutron Diffractometer (HPND) at China Spallation Neutron Source (CSNS) is a general-purpose neutron diffractometer designed with two operational modes: diffraction and imaging. HPND employs a water moderator that utilizes high neutron energy and provides a neutron flux of up to 107 n/cm2/s. It features a 90-degree detector with an optimal resolution exceeding 0.6%. The two hutches, with flight distances of 22.5 m and 29 m, respectively, accommodate different types of in-situ high-pressure neutron diffraction experiments. The first hutch is equipped with cryostats, furnaces, superconducting magnets, and portable high-pressure cells. The range of temperatures from 1.5 K to 1800 K, magnetic field intensities up to 9 T, and maximum pressures up to 20 GPa facilitate multiple fields-coupling experiments. The second hutch is equipped with a cubic press as well as neutron and X-ray tomography equipment. The cubic press enables experiments under extreme conditions, with pressures reaching 20 GPa and temperatures up to 2000 K. Currently, the commissioning and performance testing of the HPND have been completed. The neutron diffraction experiments conducted under ambient conditions, as well as in-situ variable temperature and high-pressure conditions, have been successfully executed in the HPND. The HPND at CSNS was opened to users in October 2024 and is poised to become an essential tool for investigating the structural evolution of materials under extreme conditions.
