|1954||Formation of a working group for the foundation of an institute for nuclear study.|
|1955||The Institute of Nuclear Study (INS) was established.|
|1957||Sep||FF cyclotron was completed.|
|FM cyclotron was completed.
The first experiment with the FF cyclotron took place.
|1960||Oct||The first experiment with the FM cyclotron took place.|
|1961||Dec||The Electron Synchrotron (ES) accelerated an electron beam to 750 MeV.|
|1963||Apr||The first experiment with the ES took place.|
|1964||Apr||Formation of a working group for the foundation of a new research institute for elementary particle physics.|
|1966||Mar||The ES produced a 1.3 GeV beam.|
|1971||Apr||National Laboratory for High Energy Physics (KEK) was established.|
|1976||Mar||The proton synchrotron (PS) produced an 8 GeV beam as designed.|
|Dec||The PS achieved 12 GeV.|
|1977||May||The first PS experiment took place.|
|Dec||Experiments with the SF cyclotron began.|
|1978||The Meson Science Facility was established.||The Booster Synchrotron Utilization Facility and a Photon Factory (PF) were founded.|
|1980||Jul||Experiments in the Booster Synchrotron Utilization Facility began.|
|1982||Mar||The PF succeeded in storing a 2.5 GeV electron beam.|
|1983||Jun||PF Experiments began.|
|1984||Jul||The TRISTAN Accumulation Ring (AR) accelerated an electron beam to 6.5 GeV.|
|1985||Oct||The AR accelerated a positron beam to 5 GeV.|
|1986||Nov||The TRISTAN Main Ring (MR) accelerated both electron and positron beams to 25.5 GeV.|
|1987||May||TRISTAN experiments began.|
|1988||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.|
|1989||Sep||First electron cooling by TARNII||Accelerator and Synchrotron Radiation Science departments were established in the Graduate University for Advanced Studies|
|1993||Mar||Isotope Separator On-Line (ISOL) was completed.|
|1994||Jun||KEKB B-factory construction began.|
|1995||Dec||TRISTAN experiments finished.|
|1997||The High Energy Accelerator Research Organization was established.|
|1998||First beam storage at KEKB (KEK B-factory) ring|
|1999||Apr||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.|
|2000||Tanashi Branch closed|
|2001||Construction of High Intensity Proton Accelerators (J-PARC) started|
|Became the Inter-University Research Institute Corporation High Energy Accelerator Research Organization.
K2K experiment ended
|Tokai Campus was opened.
Experiments at PS ended.
|J-PARC Center was established.
Experiments at BSF ended.
|181MeV proton beam at J-PARC Linac
3 Gev proton beam at J-PARC Rapid Cycling Synchrotron (RCS)
|2008||Oct||Prof. Makoto Kobayashi, former director of IPNS, won the 2008 Nobel Prize in Physics.|
|2009||Mar||J-PARC construction was completed.|