Feasibility demonstration of a new Fermi chopper with supermirror-coated slit package

Nakamura, Mitsutaka   ; Kambara, Wataru; Krist, T.*; Shinohara, Takenao   ; Ikeuchi, Kazuhiko*; Arai, Masatoshi; Kajimoto, Ryoichi  ; Nakajima, Kenji  ; Tanaka, Hiromichi; Suzuki, Junichi*; Harada, Masahide   ; Oikawa, Kenichi   ; Maekawa, Fujio  

The efficiency of inelastic neutron scattering measurements using a chopper spectrometer can be markedly improved by utilizing multiple incident energies (Multi-Ei method). However, in conventional chopper systems, optimization of the experimental condition for all incident energies is absolutely impossible. We developed a new Fermi chopper with a supermirror-coated slit package in order to overcome the problem and experimentally demonstrated that the full optimization of the experimental condition for multiple incident energies is nearly achieved.