抄録
The focusing performance of an ellipsoidal neutron mirror was experimentally demonstrated using BL06 beam line at J-PARC/MLF. The mirror, which was made with electroless nickel-phosphorus (NiP) plated material, has sub-micrometer form accuracy and sub-nanometer surface roughness. The results show that a circular focusing spot, of which size at full width at half maximum (FWHM) is almost equivalent to the size of pinhole, was obtained with little diffuse scattering of 10-3. The beam profiles at different mirror-center-to-detector distance (MDD) was examined which shows in a good coincidence with that of calculation by geometry optics. A focusing gain of 3 was obtained and some issues on wavelength distribution and focusing gain which differs with results based on theoretical analysis were discussed.
