Recent developments of neutron diffraction at mantle PT conditions at PLANET

Sano, Asami   

Since hydrogen has a large scattering power for neutron, neutron diffraction can be an important tool in the investigation of hydrogen in minerals. The high-pressure neutron diffractometer PLANET in the MLF at J-PARC is equipped with a 6-axis type multi-anvil press to conduct high-temperature neutron diffraction experiments at high pressure. With the application of the multi-anvil assembly (MA) 6-6, experiments have been routinely performed. One of the advantages of using the MA6-6 is that the anvil gap is located at 2 = 90, where the detector is located. However, the available pressure is currently limited below 12 GPa using MA6-6 with TEL size of 7 mm. It is necessary to expand the conditions to cover the mantle transition zone that is considered as an important reservoir of water. In this talk, I will present recent developments with applications of MA6-8 to expand the PT conditions in PLANET.