SPring-8 is a large synchrotron radiation research facility located in Harima Science Garden City in Sayo Town, Sayo District, Hyogo Prefecture, Japan. Its name stands for Super Photon ring-8 GeV, referring to the maximum electron energy of 8 gigaelectronvolts (GeV) achieved by its accelerator system.
The facility consists of a series of accelerators that generate and store high-energy electrons, experimental stations that use the resulting synchrotron radiation, and supporting research infrastructure. It is one of Japan’s leading scientific facilities, enabling researchers to study materials, biological structures, chemical processes, and other phenomena at an extremely fine scale.
From the air, the most distinctive feature of SPring-8 is its enormous circular building, which houses the storage ring. Experimental facilities and other research buildings are arranged around it. The nearby SACLA facility, short for SPring-8 Angstrom Compact free electron LAser, is also part of this advanced research complex.
SPring-8 produces exceptionally bright, highly directional synchrotron radiation across a wide range of energies. Researchers primarily use X-rays, generally in the energy range of several kiloelectronvolts to around 100 keV, to investigate the internal structures and properties of materials. The facility can also generate lower-energy infrared radiation.
In addition, by using inverse Compton scattering, in which laser light interacts with high-energy electrons, the facility can produce monochromatic gamma rays with energies of up to 2.4 GeV. These advanced capabilities make SPring-8 an important resource for scientific research and industrial development.
Construction of SPring-8 began in 1991 as a joint project of the Japan Atomic Energy Research Institute and the Institute of Physical and Chemical Research, commonly known as RIKEN. The facility began accepting users in October 1997. Its original construction cost was approximately 131.9 billion yen.
Operation and management are entrusted to the Japan Synchrotron Radiation Research Institute (JASRI), which supports the use of advanced research facilities by universities, public research institutions, and private companies. Although the main address is in Sayo Town, part of the site extends into Kamigori Town in Ako District and Shingu Town in Tatsuno City.
Visitors interested in SPring-8 can sometimes view exhibits in the Synchrotron Radiation Promotion Building and see selected external facilities, including Beamline BL02B1. Access to the accelerator and internal experimental areas is generally available during the facility’s annual public open day, usually held around April. Visitors should check the official announcements in advance, as access arrangements and dates may change.
SPring-8 shares its site with NewSUBARU, a medium-sized synchrotron radiation facility used for research and development in fields such as nanotechnology. The complex also includes SACLA, an X-ray free-electron laser facility that began operating in 2012. SACLA uses some of the same experimental infrastructure as SPring-8 and enables researchers to investigate materials and processes with extremely short, intense X-ray pulses.
The SPring-8 accelerator complex includes a linear accelerator approximately 140 meters long, which accelerates electrons to 1 GeV, and a synchrotron with a circumference of approximately 396 meters, which raises their energy to as much as 8 GeV. The main storage ring has a circumference of approximately 1,436 meters.
The facility’s beamlines connect the radiation sources to experimental stations, allowing researchers to select the type of light best suited to their work. The beamline system includes different configurations, such as bending-magnet beamlines, X-ray and soft X-ray undulators, wigglers, infrared sources, and laser-electron photon sources. Long beamlines can extend hundreds of meters, with some designs reaching approximately 1,000 meters.
SPring-8 is used by universities and research institutions throughout Japan, as well as overseas research organizations and more than 30 industrial companies, including businesses in the pharmaceutical and steel industries. Its powerful X-rays help researchers analyze material structures, develop new products, and investigate the behavior of substances under specialized conditions.
Toyota Motor Corporation began developing a dedicated beamline, BL33XU, in fiscal year 2008, becoming the first individual company to undertake such a project at the facility. This illustrates the important role SPring-8 plays in connecting fundamental scientific research with industrial innovation.
SPring-8 has also contributed to forensic science. In 1998, it was used to analyze the composition of a poison associated with the Wakayama curry poisoning case. Researchers compared the quantities of specific impurity elements in arsenic compounds, using the facility’s advanced analytical capabilities to support the investigation.
The facility has attracted attention beyond the scientific community. Scenes for the 2008 Japanese film God’s Puzzle were filmed at SPring-8. The complex has also appeared in television programming, including a travel feature broadcast on TV Tokyo in March 2009. In the Japanese television drama Kasouken no Onna, a character is transferred from the Kyoto Prefectural Police’s forensic science laboratory to SPring-8, bringing the facility into the story.
From Aioi Station, take a Wing Shinki bus bound for SPring-8. The journey takes approximately 40 minutes, covering a distance of about 20 kilometers. It is also possible to travel from Himeji Station via Harima-Shingu Station, with a transfer along the way.
A direct express bus service from Himeji Station previously operated on weekdays but was suspended on March 31, 2023. Travelers should confirm current bus routes and schedules before setting out.