Abstract
The aspherical supermirror is among the most useful optics to focus a neutron beam with a wide wavelength range. The improvement of surface roughness and enlargement of mirror size are essential for increasing the focusing gain. A highly efficient and high-precision fabrication process for the substrate of a large aspherical mirror combining conventional precision grinding, numerically controlled local wet etching (NC-LWE) figuring and low-pressure polishing was developed. Using this new fabrication process, a 400mm-long plano-elliptical neutron focusing mirror substrate was successfully fabricated with a figure error of 0.39μm p–v and an rms surface roughness of less than 0.2nm.
Published Version
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