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Report No.

Supermirror coatings for the new spallation source J-PARC

Maruyama, Ryuji   ; Yamazaki, Dai  ; Ebisawa, Toru*; Hino, Masahiro*; Soyama, Kazuhiko  

The development of high performance neutron supermirrors with high reflectivity and large $$m$$, the ratio of the effective critical angle of the supermirror to that of natural nickel, is important for the J-PARC project since it greatly increases the available neutron intensity. Neutron supermirrors consist of alternating layers of two materials with different refractive indices for neutrons. An ion beam sputtering instrument with an effective deposition area of 0.2 m$$^2$$ has been installed at the Japan Atomic Energy Agency in order to produce neutron guides, benders, and other neutron optical devices, which are planned for application in the J-PARC project. We have succeeded in fabricating the supermirror with large critical angle of $$m=6.7$$ and that with high reflectivity ($$>$$85%) for $$m=3$$.



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