Development of fabrication technique for a two-dimensional neutron focusing mirror and the performance test

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We have succeeded in fabricating large-scale self-supporting high-m neutron supermirror and very small d-spacing multilayer sheets using ion beam sputtering (IBS) instrument at KURRI. Before this study, the maximum deposition size at the KUR-IBS was limited to 200 mm in diameter and it was not enough large to fabricate neutron guide tube. In this study, we have developed new fabrication techniques and enlarged the maximum size to 460 mm in diameter. This result was a significant contribution to build a new beam line at BL06 at J-PARC and improve SANS monochromators at KURRI. The supermirror sheet was peeled off by using replica technique and the reflectivity was almost same with that of supermirror fabricated by usual process. The sheet is self-supporting and one of ideal focusing device without support material. However, the shape control is still difficult. We studied the scope of application and so far another technique is more promising in case of low-Qc(m<4) with small curvature.