Development of negative muonium ion source for muon acceleration

R. Kitamura, S. Bae, S. Choi, Y. Fukao, H. Iinuma, K. Ishida, N. Kawamura, B. Kim, Y. Kondo, T. Mibe, Y. Miyake, M. Otani, G. P. Razuvaev, N. Saito, K. Shimomura, P. Strasser

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A negative muonium ion (Mu-) source using an aluminum foil target (Al target) was developed as a low-energy muon source. Mu- ions are produced by irradiating the Al target with a 3-MeV positive muon (μ+) beam and observed using a microchannel plate. An experiment to produce Mu- ions was conducted to evaluate the performance of this Mu- ion source. The measured event rate of Mu- ions was (1.7±0.3)×10-3 Mu-/s when the event rate of the incident μ+ beam was 1.3×106/s. The experiment was conducted at the Muon Science Establishment, D-line in the Materials and Life Science Experimental Facility within the Japan Proton Accelerator Research Complex. The formation probability, defined as the ratio of the Mu- ions to the incident muons on the Al target, was (1.1±0.2(stat)+0.1-0.0(syst))×10-6. This Mu- ion source was first adopted in the commissioning of the muon accelerator at the D-line, and the event rate of the accelerated Mu- ions was consistent with the expectation. This Mu- ion source boosted the development of the muon accelerator, and the practicality of this low-energy muon source obtained using a relatively simple apparatus was demonstrated.

Original languageEnglish
Article number033403
JournalPhysical Review Accelerators and Beams
Issue number3
Publication statusPublished - 24 Mar 2021




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