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Report No.

Online full two-dimensional imaging of pulsed muon beams at J-PARC MUSE using a gated image intensifier

Ito, Takashi; Toyoda, Akihisa*; Higemoto, Wataru; Tajima, Minori*; Matsuda, Yasuyuki*; Shimomura, Koichiro*

A new muon beam profile monitor (MBPM) was developed to diagnose pulsed muon beams in J-PARC MUSE, mainly composed of a scintillation screen, a gated image intensifier (II), and a cooled CCD camera. The MBPM was designed to be compact so that it could be inserted into the bore of the $$mu$$SR spectrometer in the D1 area and used concurrently. The spatial resolution of the MBPM was evaluated to be in the range from one to two line-pair/mm, depending on II gain. Such high-resolution muon beam profiles were obtained online for a positive muon beam with a kinetic energy of $$sim$$ 4 MeV. The contribution from decay positrons was significantly reduced owing to II gating. The linearity of the MBPM was evaluated on the bases of the number of decay positrons monitored by the $$mu$$SR spectrometer. A linear response within five percent deviations was confirmed over more than two orders of magnitude. In addition, 3D imaging capability, use in vacuum, and immunity against moderate magnetic fields were demonstrated.



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Category:Instruments & Instrumentation



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