Development of high-reflectivity neutron supermirrors using an ion beam sputtering technique

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

Neutron supermirrors have been utilized as reflective optical devices at many neutron sources for transporting, focusing, polarizing neutron beam. In order to produce such devices for the new spallation neutron source (Japan Proton Accelerator Research Complex, J-PARC), an ion beam sputtering system with an effective deposition area of 0.2 m has been installed in the Japan Atomic Energy Agency. The fabrication methods and the performance of the supermirrors are discussed.