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| Hadron Facility, J-PARC | |
|---|---|
| Name | Hadron Facility, J-PARC |
| Caption | Hadron Facility experimental hall at J-PARC |
| Established | 2008 |
| Location | Tokai, Ibaraki, Japan |
| Type | Particle physics facility |
| Operating agency | Japan Atomic Energy Agency; High Energy Accelerator Research Organization |
Hadron Facility, J-PARC The Hadron Facility at J-PARC is a high-intensity secondary beam complex for studies in hadron and nuclear physics, strangeness nuclear physics, and particle interactions. It supports experiments using charged pions, kaons, protons, and neutrons produced by the J-PARC accelerator complex, serving international collaborations and linking laboratories across Asia, Europe, and the Americas. The facility integrates accelerator engineering, detector development, and theoretical interpretation to address questions in hadron structure, hypernuclei, and symmetry breaking.
The Hadron Facility functions within the Japan Proton Accelerator Research Complex framework alongside Materials and Life Science Experimental Facility and Neutrino Experimental Facility. Primary components include the Main Ring extraction, the Tokai beam transport lines, and target stations delivering secondary beams to experimental halls. It enables experiments related to Quantum Chromodynamics, strangeness, hadron spectroscopy, and tests relevant to Standard Model extensions. International users from institutions such as KEK, JAEA, RIKEN, CERN, Fermilab, CERN NA61/SHINE, TRIUMF, SLAC, DESY, GSI Helmholtz Centre for Heavy Ion Research, Brookhaven National Laboratory, Lawrence Berkeley National Laboratory, Institute of High Energy Physics (Beijing), Institute for Nuclear Research of the Russian Academy of Sciences, Czech Technical University in Prague, and University of Tokyo participate in its programs.
Plans for the Hadron Facility emerged during proposals for a multi-purpose high-intensity proton complex involving KEK and JAERI; the merged project became J-PARC under JAEA and KEK. The facility was built as part of a phased construction including the Linac (J-PARC), Rapid Cycling Synchrotron, and Main Ring. Early commissioning involved collaborations with groups from University of Manchester, Imperial College London, Oxford University, University of California, Berkeley, Nagoya University, Kyoto University, and Tohoku University. Milestones included first user runs, upgrades for intensity, and responses to incidents prompting safety reviews by Nuclear Regulation Authority (Japan). The development timeline intersects with international projects like JLab, MAMI, ELPH, and Jefferson Lab initiatives.
The Hadron Facility receives protons from the Main Ring at energies tailored for secondary production, routing beams through the Hadron Beamline and branching into experimental beamlines such as K1.8, K1.8BR, K1.1BR, and neutron channels. Target stations employ materials and cooling designs influenced by engineering studies at CERN and GSI Helmholtz Centre for Heavy Ion Research. Beam instrumentation incorporates technologies developed in partnership with KEK, JAEA, RIKEN, Fermilab, TRIUMF, DESY, and SLAC. The complex supports both long-baseline experiments linked to T2K infrastructure and fixed-target spectroscopy programs comparable to COMPASS and HERMES.
Experimental suites include spectrometers, cryogenic targets, hypernuclear separators, and time-of-flight systems used by collaborations from Osaka University, Kyoto University, Nagoya University, Kobe University, Waseda University, Hokkaido University, University of Edinburgh, University of Glasgow, Seoul National University, Peking University, National Taiwan University, University of Melbourne, and University of British Columbia. Key apparatuses are the E50 spectrometer-style setups, the E13 hypernuclear program instruments, detectors analogous to CLAS and Belle II subsystems, and neutron detectors paralleling J-PARC MLF instrumentation. Data acquisition and computing link to grids and centers like KEK Computing Research Center, RIKEN R-CCS, CERN Openlab, NERSC, and IHEP computing center.
Experiments at the facility have advanced knowledge of hypernuclei formation, exotic baryons, and kaon-nucleon interactions, contributing to interpretations relevant for neutron stars and dense matter modeling pursued at RIKEN and KEK. Results include high-precision cross sections, spectroscopy of strange baryons, and searches for pentaquark-like states informed by complementary measurements at LHCb, Belle, BaBar, BESIII, and CLAS12. Studies have implications for chiral perturbation theory, lattice QCD comparisons performed at KEK, Brookhaven National Laboratory, CERN, RIKEN, and RIKEN BNL Research Center. Collaborative analyses involved groups from University of California, Los Angeles, University of Illinois Urbana-Champaign, Purdue University, University of Tokyo Institute for Solid State Physics, and International Center for Hadron Physics.
Operation is coordinated by J-PARC management with oversight from KEK and JAEA, and it hosts user meetings, workshops, and annual reviews with participants from European Organization for Nuclear Research, US Department of Energy national laboratories, National Institutes of Natural Sciences (Japan), Asian Nuclear Physics community, and university consortia. Beam time allocation follows peer review processes engaging panels with representatives from APS Division of Nuclear Physics, EPS, IUPAP, and national funding agencies like MEXT (Japan), JSPS, NSF (United States), ERC, DFG, ANR, NSFC, and KAKENHI. Training and outreach include programs with University of Tokyo Graduate School, Tokyo Institute of Technology, Kyoto University Graduate School, and international schools linked to CERN Summer Student Programme.
Safety systems and upgrade paths reflect lessons from incidents at accelerator facilities worldwide, incorporating standards from International Atomic Energy Agency guidance and engineering collaboration with CERN, Fermilab, and GSI. Planned upgrades target higher intensity, additional beamlines, and detector modernization in partnership with KEK and international collaborations including teams from CERN, RIKEN, Brookhaven National Laboratory, TRIUMF, DESY, SLAC, University of Tokyo, Osaka University, and Nagoya University. Long-term visions link the Hadron Facility to global programs in hadron physics, coordination with projects such as Electron-Ion Collider, FAIR, JLab 12 GeV Upgrade, and next-generation lattice and theoretical efforts at Perimeter Institute and Institute for Advanced Study.
Category:Particle physics facilities Category:Research institutes in Ibaraki Prefecture