構造生物 Vol.5 No.2
1999年9月発行

High Energy Accelerators for Synchrotron Radiation Research


Yoshitaka Kimura

High Energy Accelerators for Synchrotron Radiation Research Institute of Materials Structure Science. KEK

Nowadays particle accelerators are widely utilized for research in materials and life science. In particular. development in electron storage rings as light sources is conspicuous. The Japanese Society for Synchrotron Radiation Research formed by light source users includes more than thousands members. Historically. high energy accelerators were developed as experimental tools for high energy physics to study elementary particles. And initial synchrotron radiation research shared accelerator facilities with high energy physics. In Japan. both the high energy physics and radiation research started the experimental activity early in the 1960s at the 1.3 GeV electron synchrotron of Institute for Nuclear Study. Tokyo University. Since then. a number of radiation facilities like PF and SPring 8 were built on the basis of the storage ring technologies developed for electron-positron colliders for high energy physics.

These days interest of the world accelerator community for radiation research is in development of the fourth generation light source. that generates intense highly coherent X-rays by application of the SASE (Self Amplified Spontaneous Emission) principle. It will consists of a 10-20 GeV electron linac and an undulator as long as 100 m. and coherent X-ray with a peak brilliance of 〜3 X 1032(5 X I021 in average)/sec・mm2・mr2・0.1% BW and a pulse width of 〜10-13 sec will be obtainable at 1A in wave length. This light source requires very stable low emittance electron beams and shares many advanced technologies with those for the TeV range linear electron-positron collider for high energy physics. In the last ten years, KEK has been making extensive R&D effort for the linear collider, and is setting about making an R&D plan for the fourth generation light source.

Generally. however, in order to promote a large scale development program. we are always required to show how revolutionary the scientific outcome obtainable with such an advanced technology will be. Now the structural biology is a leading figure in the synchrotron radiation research fields. And we are hoping to know what appealing research subjects of the structural biology can be studied at a fourth generation facility in the future.


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sasaki@tara.met.nagoya-u.ac.jp