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Yamaguchi, Yuji; Kondo, Yasuhiro; Meigo, Shinichiro; Oguri, Hidetomo; Oi, Motoki; Saha, P. K.; Shinozaki, Shinichi; Takayanagi, Tomohiro; Yamamoto, Kazami
JPS Conference Proceedings (Internet), 45, p.011162_1 - 011162_7, 2026/06
A high-power 3-GeV proton beam from a rapid cycling synchrotron (RCS) is transported to a neutron production target at Materials and Life Science Experimental Facility (MLF) by a 3-GeV RCS to Neutron facility Beam Transport (3NBT) line in J-PARC. Recently, the design beam power of 1 MW has been achieved. By this achievement, a future plan of MLF second target station (TS2) is motivated for enhancing brightness of the secondary beams and requires a new beam transport line for the 3-GeV proton beam. The design study of the new transport line has been started based on the previous work and is being performed regarding the optics and shielding of the beamline incorporating latest beam commissioning results. In this presentation, we report a brief concept of the new transport line and current status of the design study.
Yamaguchi, Yuji; Kondo, Yasuhiro; Meigo, Shinichiro; Shinozaki, Shinichi; Takayanagi, Tomohiro; Fujimori, Hiroshi*; Kawamura, Naritoshi*
Journal of Physics; Conference Series, 3094(1), p.012023_1 - 012023_5, 2025/09
The 3-GeV proton beam from the rapid cycling synchrotron (RCS) of J-PARC is transported to the spallation neutron source at Materials and Life Science Experimental Facility (MLF) by a 3-GeV RCS to Neutron facility Beam Transport (3NBT) line. Recently, the first design idea of a new proton beam transport line has been proposed for a future target station of the MLF (TS2). In the present study, proton beam transport is simulated near the TS2 target where a bending magnet and a solenoid are located for muon beam transport. The purposes are to clarify the magnetic field effects on the proton beam by the magnets and to present a method to correct each effect. Orbit deviation by the bending magnet and vertical size expansion due to profile rotation by the solenoid can be corrected by installing additional bending magnets and a solenoid with reversal magnetic field, respectively. The correction method is expected to be effective and also needs to be studied further for detail design.
