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@inbook{doi:10.7566/JPSCP.45.011165,

title = {3D-Printed Aluminum Alloy Beam Window for COMET Project in Phase-1},
booktitle = {Proceedings of the 4th J-PARC Symposium 2024},
chapter = {},
pages = {},
doi = {10.7566/JPSCP.45.011165},
URL = {https://journals.jps.jp/doi/abs/10.7566/JPSCP.45.011165},
eprint = {https://journals.jps.jp/doi/pdf/10.7566/JPSCP.45.011165},
    abstract = { The COherent Muon to Electron Transition (COMET) project is exploring the lepton flavor violation process in J-PARC Hadron experimental facility. The initial phase, phase-α was successfully completed with the proton beam power 0.3 [kW]. In the beam line, the muon transport solenoids are composed of superconducting magnets which are kept cool by liquid Helium (LHe). The installed beam windows should be robust enough to withstand against the rapid and high pressure increase over 0.3 [MPa] in emergency of LHe quenching and unexpected leakage in the beamline until rupture disks break. At the same time, for high transmission efficiency the material density must be low, and the thickness must be as thin as possible, while minimizing the energy loss of the pion and the muon beam. Thus, for the phase-α we have developed the 3D-printed windows made by Ti–6Al–4V which has radius curvature on to the beam passing area, instead of a conventional thin and flat shape. Then we started the R\&D of the beam windows for coming phase-1. In the phase, the proton beam power will be increased to 3.2 [kW] and there are beam windows to be developed. At present we focus on the development of the window for the beam duct. By the R\&D we decided to manufacture the window by 3D-printer with the aluminum alloy, AlSi10Mg which can be welded to the beam duct directly to maximize the beam passing area. We report the R\&D results and the history of Ti–6Al–4V window for phase-α and the progress of the aluminum alloy window for phase-1. }
}