Abstract
The Muon Science Establishment (MUSE) at the Japan Proton Accelerator Research Complex (J-PARC) introduced an intense pulse surface muon beam for material science in late 2017. This development at MUSE enables researchers to utilize this highly controlled muon beam to study materials with enhanced accuracy and reliability. Our work aims to investigate proton transmission, surface muon production, contamination on a surface muon beam, and characteristics of the beam at surface muon beamline. Using Monte Carlo simulation programs, GEANT4 and G4beamline, to study interactions between the 3 GeV proton beam and the muon target. The results showed 95.43% proton transmission through the muon target. At the S-line entrance, the surface muon yield is 1.43 \(\varvec{\times }\) 10\(^{-\text {7}}\). The transverse positional distribution and phase space of the surface muon beam were also provided in this study. Our findings present an asymmetry along the horizontal axis and the beam entering the S-line is characterized as divergent, increasing in its transverse size. In summary, the primary proton beam loss at the muon target is 4.57%, which falls within the acceptable range for neutron facility operations that share the proton beam with the muon facility. The characteristics of the surface muon beam will be used for beam dynamic calculation and compared with the result considering the leakage magnetic fields from neighboring beamlines.
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No datasets were generated or analysed during the current study.
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Acknowledgements
We would like to express our very great appreciation to Koichiro Shimomura and Naritoshi Kawamura for their valuable information and the suggestion of the muon science facility at J-PARC and the muon production. Their willingness to give their time so generously has been very much appreciated. We would also like to extend our thanks to Patrick Strasser for his help in giving information on the surface muon beamline and the muon target chamber. Our grateful thanks are also extended to Soshi Takeshita, Motonobu Tampo, and Shiro Matoba for their advice in the simulation. Special thanks should be given to Akihiro Koda for his valuable support on this project. We are grateful to HOKUSAI from RIKEN and CHALAWAN from the National Astronomical Research Institute of Thailand (NARIT) for providing computational resources in the simulations. Phanthip Jaikaew would like to thank for the support from International Program Associate of RIKEN (IPA) and the Science Achievement Scholarship of Thailand (SAST). Phanthip Jaikaew, Sakhorn Rimjaem and Chitrlada Thongbai would like to acknowledge the support from Chiang Mai University.
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All authors made substantial contributions to the conceptualization and design of the study. Specifically, P. Jaikaew contributed to the simulation with guidance from T. Adachi. The primary manuscript text was authored by P. Jaikaew under the mentorship of I. Watanabe and C. Thongbai. The final version received approval from both C. Thongbai and S. Rimjaem.
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Jaikaew, P., Rimjaem, S., Thongbai, C. et al. Surface muon production at J-PARC muon facility. Interactions 245, 24 (2024). https://doi.org/10.1007/s10751-024-01865-6
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DOI: https://doi.org/10.1007/s10751-024-01865-6