Basic Information

Tsukuba Campus
Tokai Campus

In the most advanced research areas, it is becoming difficult for any university to maintain experimental and observatory facilities due to their increasing scale and sophistication. Therefore, the Inter-University Research Institutes that develop and prepare those facilities and make them available to researchers in Japan and abroad were established based on the National University Corporation Law.

The Inter-University Research Institutes Corporations run those Institutes, with four in Japan. KEK, the High Energy Accelerator Research Organization, is one of them.

KEK is short for “Ko Energy-kasokuki Kenkyukiko,” which means “High Energy Accelerator Research Organization” in Japanese. The predecessor of the High Energy Accelerator Research Organization, the High Energy Physics Laboratory, was also abbreviated as KEK.

Corporate NameHigh Energy Accelerator Research Organization, an Inter-University Research Institutes Corporation
RepresentativeDirector General Dr. Masanori Yamauchi
Locations1-1 Oho, Tsukuba, Ibaraki 305-0801 Japan (Tsukuba Campus)
203-1 Shirakata, Tokai-mura, Ibaraki 319-1106 Japan (Tokai Campus)
PhonePhone +81-29-864-5114 (General Affairs Division)
Business hours8:30~17:00
EstablishedApril 1971 as the High Energy Physics Laboratory
April 1997 the High Energy Accelerator Research Organization
Research areaResearch on the structure and function of elementary particles, atomic nuclei, and materials using high-energy accelerators, and research to improve the performance of high-energy accelerators (Article 5 of the National University Corporation Law)
High Energy Accelerators at KEKIn Tsukuba: Linac, SuperKEKB, Photon Factory Light Source
In Tokai: Linac, RCS, Main Ring
Affiliated Inter-University Research InstitutesInstitute of Particle and Nuclear Studies, Institute of Materials Structure Science (Article 1 of ministerial ordinance of the National University Corporation Law)
Number of employees1,084 (as of April 2023)
Site Area1.5 km2(Tsukuba Campus), 0.1 km2(Tokai Campus)

KEK has two institutes, two laboratories and one of the institutes of the World Premier International Research Center Initiative (WPI), which is promoted by the Ministry of Education, Culture, Sports, Science and Technology (MEXT).

At the Tokai Campus, KEK and the Japan Atomic Energy Agency (JAEA) jointly operate the Japan Proton Accelerator Research Complex (J-PARC).

Our Logo

The combination of ellipses representing KEK symbolizes the various accelerators at KEK, and the curves that appear to fly outwards symbolize multiple probes such as synchrotron radiation, neutrinos, neutrons, and muons.

Permanent Exhibit and Lab Tour

We have the Permanent Exhibit, the KEK Communication Plaza, that showcases our research at the Tsukuba Campus. We also accept tours for groups of 10 or more people.

Open House

Every summer or fall, the Tsukuba Campus holds the KEK Open House, where anyone can freely tour the campus, and the Spring Campus Open House, which is in conjunction with Science and Technology Week. J-PARC center also holds an open house every year at the Tokai Campus.

KEK Original Goods

KEK original stationery and T-shirts are available at KEK kiosk, museum stores at various science museums, and online.

Updated 2024/03/12