Development of focusing supermirors by means of ultra-precise surface figuring and ion beam sputtering

Yamazaki, Dai  ; Hayashida, Hirotoshi; Maruyama, Ryuji   ; Kasugai, Yoshimi  ; Shinohara, Takenao   ; Soyama, Kazuhiko  ; Nagano, Mikinori*; Mitsushima, Naoki*; Yamamura, Kazuya*

Neutron beam focusing is essential to perform measurements on small areas of a sample as well as small angle scattering (SANS) measurements in that focusing can both enhance beam intensity at the sample and reduce backgrounds. When it comes to pulsed neutrons, a focusing optics must be free from chromatic aberration. Hence a reflective optics based on total reflection is preferable. We have been developing focusing supermirrors by depositing a supermirror on a precisely figured aspheric surface. We will present measurement results of a multiply-stacked mirror, two-dimensional focusing with a Kirkpatrick-Baez configuration and several applications to sample measurements including SANS and prompt-gamma spectroscopy.