Operation status of J-PARC accelerator system

Yamamoto, Kazami   ; Kinsho, Michikazu  ; Oguri, Hidetomo  ; Hayashi, Naoki  ; Yamazaki, Yoshio ; Naito, Fujio*; Yoshii, Masahito*; Toyama, Takeshi*; Igarashi, Susumu*; Hotchi, Hideaki*

The Japan Proton Accelerator Research Complex (J-PARC) is designed to deliver high-intensity proton beams for various kinds of scientific programs. The accelerator complex consists of a 400-MeV linac, a 3-GeV Rapid-Cycling Synchrotron (RCS) and a 30-GeV Main Ring synchrotron (MR). The RCS delivers proton beams to the Materials and Life Science Experimental Facility (MLF, neutron and muon facility) and the MR. The MR delivers beams to the Neutrino target and the Hadron Experimental Facility. At present, the RCS delivers a 750-kW beam to the MLF. The MR delivers a 515-kW beam for the neutrino experiment and a 60-kW beam for the hadron experiments. Recent availabilities are more than 90% for the MLF users and around 80% for the MR users. We achieved the 1-MW continuous operation with 1 hour (2018), 10 hours (2019) and 36 hours (2020). The results of the 1-MW demonstrations indicated some issues to establish the stable 1-MW operation. MR has a plan to shorten its acceleration cycle to 1.3 s. We have been constructing the new power supply systems for the main dipole and quadrupole magnets. We have started the installation of the new power supply since summer 2021.