Online monitoring of negative muon beam profiles at J-PARC MUSE using a gated image intensifier

J-PARC MUSEにおけるゲートイメージインテンシファイアを用いた負ミュオンビームプロファイルのオンラインモニタリング

伊藤 孝   ; 髭本 亘  ; 二宮 和彦*; 久保 謙哉*; 河村 成肇*; 下村 浩一郎*

Ito, Takashi; Higemoto, Wataru; Ninomiya, Kazuhiko*; Kubo, Kenya*; Kawamura, Naritoshi*; Shimomura, Koichiro*

We report on negative muon beam imaging at J-PARC MUSE using a newly-developed online muon beam profile monitor. A beam spot of a 3.8-MeV pulsed negative muon beam was clearly visualized in a few minutes. Decay electron background was significantly reduced owing to high-speed gating capability of a gated image intensifier installed in the muon beam profile monitor. A 3D map of negative muon intensity distribution was obtained at around the beam exit in the D2 experimental area, using a movable feature of this instrument.