History

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.
1958	May Jun	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
2004	Apr Nov	Became the Inter-University Research Institute Corporation High Energy Accelerator Research Organization. K2K experiment ended
2005	Apr Dec	Tokai Campus was opened. Experiments at PS ended.
2006	Feb Mar	J-PARC Center was established. Experiments at BSF ended.
2007	Jan Oct	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.