Formation of a working group for the foundation of an institute for nuclear study.
1955The Institute of Nuclear Study (INS) was established.
1957Sep:FF cyclotron was completed.
1958May:FM cyclotron was completed.
Jun:The first experiment with the FF cyclotron took place.
1960Oct:The first experiment with the FM cyclotron took place.
1961Dec:The Electron Synchrotron (ES) accelerated an electron beam to 750 MeV.
1963Apr:The first experiment with the ES took place.
1964Apr:Formation of a working group for the foundation of a new research institute for elementary particle physics.

1966Mar:The ES produced a 1.3 GeV beam.
1971Apr:National Laboratory for High Energy Physics (KEK) was established.
1976Mar:The proton synchrotron (PS) produced an 8 GeV beam as designed.
Dec:The PS achieved 12 GeV.
1977May:The first PS experiment took place.Dec:Experiments with the SF cyclotron began.
1978The Booster Synchrotron Utilization Facility and a Photon Factory (PF) were founded.The Meson Science Facility was established.
1980Jul:Experiments in the Booster Synchrotron Utilization Facility began.
1982Mar:The PF succeeded in storing a 2.5 GeV electron beam.
1983Jun:PF Experiments began.
1984Jul:The TRISTAN Accumulation Ring (AR) accelerated an electron beam to 6.5 GeV.
1985Oct:The AR accelerated a positron beam to 5 GeV.
1986Nov:The TRISTAN Main Ring (MR) accelerated both electron and positron beams to 25.5 GeV.
1987May:TRISTAN experiments began.
1988Apr:The Meson Science Facility was reorganized as a Laboratory (MSL)
Nov:The MR energy was upgraded to 30 GeV with the help of superconducting accelerating cavities.
1989Accelerator and Synchrotron Radiation Science departments were established in the Graduate University for Advanced StudiesSep:First electron cooling by TARNII
1993Mar:Isotope Separator On-Line (ISOL) was completed.
1994Jun:KEKB B-factory construction began.
1995Dec:TRISTAN experiments finished.
1997The High Energy Accelerator Research Organization was established.
1998First beam storage at KEKB (KEK B-factory) ring
1999Apr:The Department of Particle and Nuclear Science was founded in the Graduate University for Advanced Studies.
May:The Long-baseline Neutrino Oscillation experiment (K2K) began.
Jun:The Belle experiment at the KEK B-factory began operation.
2000Tanashi Branch closed
2001Construction of High Intensity Proton Accelerators (J-PARC) started
2004Apr:Became the Inter-University Research Institute Corporation High Energy Accelerator Research Organization.
Nov:K2K experiment ended
2005Apr:Tokai Campus was opened.
Dec:Experiments at PS ended.
2006Feb:J-PARC Center was established.
Mar:Experiments at BSF ended.
2007Jan:181MeV proton beam at J-PARC Linac
Oct:3 Gev proton beam at J-PARC Rapid Cycling Synchrotron (RCS)
2008Oct:Prof. Makoto Kobayashi, former director of IPNS, won the 2008 Nobel Prize in Physics.
2009Mar:J-PARC construction was completed.
2010Jun:The Belle experiment ended
2011Construction of the SuperKEKB started
2016Phase 1 operation of the SuperKEKB started

Updated 2024/03/11