Abstract
3He spin filter is a useful neutron polarization device as a neutron polarizer and an analyzer in neutron scattering experiments because of its capabilities to polarize neutrons in broad energy range and cover wide solid angle. We are developing a 3He spin filter, based on the Spin Exchange Optical Pumping (SEOP) for polarized neutron scattering experiments at Materials and Life Science Experimental Facility (MLF) of J-PARC. A 3He gas-filling station was constructed at J-PARC, and several 3He cells with long spin relaxation times have been fabricated. A compact pumping systems with laser powers of 110 W was developed, and a 3He polarization of 85 % was achieved under real experimental conditions. Several user experiments utilizing the 3He spin filter are now being conducted at several beamlines at MLF. The development and utilization of 3He spin filters at MLF of J-PARC are reported.
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