Layout of photon absorbers in the SSRF storage ring

There are 40 bending magnets in the 432-m storage ring of the Shanghai Synchrotron Radiation Facility(SSRF).A total power of 435 kW is delivered by synchrotron radiations when the electron beams pass through the bending magnets.Only a small part of the radiation is extracted into the beamlines and the experiment stations, and the rest has to be absorbed and transferred out of the storage ring.Photon absorbers are placed at different points of the storage ring to intercept the unused synchrotron radiation and align the extracted light.In this paper, the radiation treatment method is discussed and layout of the absorbers is described in detail.The structure of the absorbers, the manufacture and assembly, and performance of the absorbers are introduced.