Abstract
J-PARC, the Japan Proton Accelerator Research Complex, is an accelerator, which provides a high-intensity proton beam. Recently as a very attractive project, the acceleration of heavy ions produced by supplementary ion sources, called J-PARC-HI, is seriously contemplated by domestic as well as international communities. The planned facility would accelerate heavy ions up to U92+ with a beam energy 20 AGeV ([see formula in PDF] of 6.2 AGeV). The highlight of the J-PARC-HI project is its very high beam rate up to ~1011 Hz, which will enable the study of very rare events. Taking advantage of this high intensity, J-PARC-HI will carry out frontier studies of new and rare observables in this energy region: (i) nuclear medium modification of chiral property of vector mesons through low-mass di-lepton signal, (ii) QCD critical pointcharacterization through event-by-event fluctuation signals of particle production, (iii) systematic measurements related to the equation of state through collective flow signal or two-particle momentum correlation signal, or (iv) the search of hyper nuclei with multi strangeness including or exceeding S = 3. The current plan of J-PARC-HI aims to carrying out the first experimental measurements in 2025.
Highlights
J-PARC, the Japan Proton Accelerator Research Complex, is an accelerator, which provides a high-intensity proton beam
In JPARC, three experimental facilities are in operation: materials and life-science facility (MLF), neutrino facility (NU), and hadron experimental hall (HD)
In January 2007, the proton beam was successfully accelerated to 181 MeV, and the commissioning of Rapid Cycle Synchrotron (RCS) and Main Ring synchrotron (MR) followed
Summary
At J-PARC, which provides one of the most intense proton beams in the world, a number of experimental programs are ongoing. As of January 2017, the JPARC physics advisory committee (PAC) approved 14 experiments at the Stage-1 (which is a partial approval to admit scientific interests), and 17 experiments at Stage-2 (which is the final approval after feasibility review and safety reviews). The latter experiments include 4 experiments, which have completed data taking and 5 experiments whose data taking is on-going. Among the variety of experimental programs at the J-PARC accelerator complex [3], several highlighted experiments at the hadron experimental hall are listed, and described in the following subsections Among the variety of experimental programs at the J-PARC accelerator complex [3], several highlighted experiments at the hadron experimental hall are listed in Table 1, and described in the following subsections
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