[en] Material and life science test facility is under the construction as a part of the Japan proton accelerator research complex (J-PARC) that utilizes an immense proton power (1-MW) accelerator. A 1-MW pulse spallation neutron source, that is the main facility at the material and life science test facility, is one of the world largest spallation neutron sources, utilizing a mercury target and liquid or supercritical hydrogen moderators. The neutron source has been designed and fabricated to exploit a state-of-the-art technology of the spallation neutron source engineering, expecting to produce one or two orders higher neutron intensity than that of the conventional neutron sources at the cold neutron regime. (author)