Development of radial collimators for chopper spectrometer at J-PARC

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

Recently, there is a growing need for neutron inelastic scattering experiments under special sample environments such as strong magnetic field and high temperatures. However the unwanted scattering originating from the sample environment equipment adversely affect the detection of weak inelastic signal. In order to overcome these difficulties, we have developed the radial collimators for chopper spectrometers at J-PARC. In this report we will show the results of performance evaluation tests for radial collimators.