Development of oscillating radial collimator for the Fermi chopper spectrometer 4SEASONS at J-PARC

Nakamura, Mitsutaka   ; Kambara, Wataru*; Kajimoto, Ryoichi  ; Ikeuchi, Kazuhiko*; Iida, Kazuki*; Kamazawa, Kazuya*; Ishikado, Motoyuki*; Inamura, Yasuhiro  ; Aoyama, Kazuhiro

The needs for inelastic neutron scattering experiments under a special sample environment 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 (ORC) specialized for the Fermi chopper spectrometer 4SEASONS on the BL01 beamline at MLF in J-PARC. The developed ORC is equipped with the control system which guarantee the homogeneity of scattering signal. In this presentation, we report the performances and remaining issues of newly-developed ORC for 4SEASONS.