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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.
Yee-Rendon, B.; Kondo, Yasuhiro; Tamura, Jun; Nakano, Keita; Maekawa, Fujio; Meigo, Shinichiro
Proceedings of 19th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.179 - 183, 2023/01
The Japan Atomic Energy Agency accelerator-driven subcritical system (JAEA-ADS) pursues the reduction of nuclear waste by transmuting minor actinides. JAEA-ADS project drives a 30-MW proton beam to a lead-bismuth eutectic (LBE) spallation target to produce neutrons for a subcritical core reactor. To this end, the JAEA-ADS beam transport (BT) must provide a suitable beam profile and stable beam power to the beam window of the spallation target to avoid high-thermal stress in the components, such as the beam window. The beam transport was optimized by tracking a large number of macroparticles to mitigate the beam loss, performance with high stability in the presence of errors, and fulfill the length requirement on the transport. This work presents beam transport design and beam dynamics research for the JAEA-ADS project.
Sakamoto, Shinichi; Meigo, Shinichiro; Fujimori, Hiroshi*; Harada, Masahide; Konno, Chikara; Kasugai, Yoshimi; Kai, Tetsuya; Miyake, Yasuhiro*; Ikeda, Yujiro
Nuclear Instruments and Methods in Physics Research A, 562(2), p.638 - 641, 2006/06
Times Cited Count：9 Percentile：52.06(Instruments & Instrumentation)Materials and Life Science Facility of Japan Proton Accelerator Research Complex (J-PARC) is an experimental facility where neutron and muon beams are provided as powerful probes. They are generated with high-intensity proton beam supplied through a 3-GeV proton beam transport (3NBT) line. Its beam optics and components were designed to transport the proton beam of large emittance with extremely low loss rate. The 3NBT accommodates an intermediate target that causes large beam loss. The scheme of the cascade target system was carefully devised to overcome difficulties due to high radiation.
Oi, Motoki; Meigo, Shinichiro
JAERI-Tech 2005-025, 52 Pages, 2005/03
JAERI-Tech-2005-025.pdf:3.28MB
In the J-PARC 3GeV proton beam transport facility (3NBT), proton beam profile monitor, halo monitor, loss monitor and proton current monitors are used as proton beam monitor. The electric signals from these monitors are converted to digital signal with ADC on CAMAC modules and monitoring with EPICS system through CAMAC controller CC/NET. At the 3NBT proton beam monitor system, these are monitored with frequency of 25Hz and all of these data are archived. In this report, we develop the EPICS system for 3NBT proton beam monitors and confirm the performance of the system. As a result, we can monitor and archive these proton beam monitor signals at 25 Hz with CC/NET and EPICS.
Sakamoto, Shinichi; Meigo, Shinichiro; Konno, Chikara; Kai, Tetsuya; Kasugai, Yoshimi; Harada, Masahide; Fujimori, Hiroshi*; Kaneko, Naokatsu*; Muto, Suguru*; Ono, Takehiro*; et al.
JAERI-Tech 2004-020, 332 Pages, 2004/03
JAERI-Tech-2004-020.pdf:17.93MB
One of the experimental facilities in Japan Proton Accelerator Research Complex (J-PARC) is the Materials and Life Science Experimental Facility (MLF), where high-intensity neutron beams and muon beams are used as powerful probes for materials science, life science and related engineering. The neutrons and muons are generated with high-intensity proton beam from 3-GeV rapid cycling synchrotron (RCS). The high-intensity proton beam has to be effectively transported, and a neutron production target and a muon production target have to be also properly irradiated. The principal design of the 3-GeV proton beam transport facility (3NBT) is systematized.
Agematsu, Takashi; Kamiya, Tomihiro; Kaneko, Hirohisa; Mizuhashi, Kiyoshi; Saito, Yuichi; Chiba, Atsuya; Fukuda, Mitsuhiro; Arakawa, Kazuo
Proceedings of 13th Symposium on Accelerator Science and Technology, p.467 - 469, 2001/10
A new project aiming a breakthrough in biotechnology and materials science has been proposed at TIARA (Takasaki Ion Accelerators for Advanced Radiation Application) facilities of JAERI. We have started designing a K900 superconducting AVF cyclotron (K900 SCC). The beam transport line for JAERI K900 SCC has been designed preliminary for heavy ion beams with an energy of more than a hundred MeV/n. An achromatic beam transport system has been designed for high transmission efficiency of ion beams and good adjustability of magnet parameters using the computer code "TRANSPORT".
Goto, Shunji*; Ohashi, Haruhiko*; Takeshita, Kunikazu*; Yabashi, Makina*; Yamakata, Masaaki*; Asano, Yoshihiro; Ishikawa, Tetsuya*
Nuclear Instruments and Methods in Physics Research A, 467-468(Part1), p.813 - 815, 2001/07
Times Cited Count：4 Percentile：27.79(Instruments & Instrumentation)no abstracts in English
