Abstract
The SPring-8 project is in progress in Japan. The main facility is an 8 GeV storage ring dedicated to synchrotron radiation [H. Kamitsubo et al. (this conference)]. The main feature of the ring is in the free straight sections 30 m long. In this paper the design of the long straight sections and how to use them is described. The long free straights are achieved through two phases to make the commissioning of the ring smooth. In the second phase, the long free straight sections are available. These long straight sections have the following potential to realize (1) extremely high brilliance, (2) multiundulators with broadband, and (3) free electron lasers. The emittance of the stored electron beam can be reduced to subnano m rad at 4 GeV with damping wigglers. Three-order higher brilliance can be obtained around 4 keV. With these optics, three-dimensional simulation was performed for free electron lasers (FEL). The calculated gain was not so large in the practical peak current level.
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