A Diode-like Neutron Mirror for a Cold Neutron Moderator for Use in Neutron Beam Facilities

We propose a new type of neutron mirror for a cold moderator to provide a bright collimated beam. The neutron mirror has high reflectivity on its front side and is transparent on its back side. It works like a diode at a small glancing angle, and its use makes it possible to obtain a bright collimated beam by using both the neutron mirror and moderator material. Here we explain the concept of the diode-like neutron mirror and describe its feasibility as tested in a numerical simulation.