Synchrotron radiation in Japan : status and new projects

Abstract
A general overview is given on new activities in synchrotron radiation (SR) facilities. There are 15 compact SR sources in operation in Japan, and their applications beside of X-ray lithography are reported as a distinctive feature of Japan. The highlights of new projects are use of TRISTAN Main Ring with a circumference of 3 km for SR and the 3rd generation X-ray source "SPring-8" (Super Photon Ring, 8 GeV) : The former will be operated at 10 GeV with a beam current of larger than 10 mA (Emittance : 5 nmrad), probably for three months in spring, 1995. The latter will be opened with 10 public beamlines in 1997, and its strategy to cover photon energy as low as 100 eV should be emphasized, because non of plans for VUV-SX brilliant sources has come on line at present in this country. The aim of the 3rd-generation sources is to make microscopic analyses and time-resolved measurements possible. The brilliant X-ray beams, however, have a possibility to exceed the intensity limit for non-destructive observation. This problem is discussed from optimistic and pessimistic views.