Oscillating radial collimators for the chopper spectrometers at MLF in J-PARC

Nakamura, Mitsutaka   ; Kawakita, Yukinobu  ; Kambara, Wataru; Aoyama, Kazuhiro; Kajimoto, Ryoichi  ; Nakajima, Kenji  ; Kawamura, Seiko   ; Ikeuchi, Kazuhiko*; Kikuchi, Tatsuya  ; Inamura, Yasuhiro  ; Iida, Kazuki*; Kamazawa, Kazuya*; Ishikado, Motoyuki*

The needs for inelastic neutron scattering experiments under the special sample environment such as strong magnetic field and high temperature are recently increasing. However, the unwanted scatterings originating from these devices affect the detection of weak inelastic signals. In order to overcome this problem we have developed an oscillating radial collimator specialized for the chopper spectrometer at Materials and Life Science Experimental Facility (MLF) in J-PARC. In this study, we will report the performances of newly-developed oscillating radial collimators both for 4SEASONS and AMATERAS.