Development And Demonstration Of In-Situ Slop He-3 Spin Filter System For Neutron Spin Analyzer On The Sharaku Polarized Neutron Reflectometer At J-Parc

A new neutron reflectometer, SHARAKU, with a vertical sample-plane geometry was installed at beam line 17 at J-PARC Materials and Life Science Facility. Although a polarizing supermirror was previously installed as a neutron spin analyzer on SHARAKU, a He-3 spin filter is advantageous because it can cover a large solid angle. An in-situ SEOP He-3 spin filter system using a new compact laser unit has been developed for the analyzer. In this paper, we report a successful off-specular measurement with the new compact in-situ SEOP analyzer at SHARAKU.