Experimental enclosures for synchrotron radiation: Design considerations

The Stanford Synchrotron Radiation Laboratory (SSRL) uses synchrotron radiation from the storage ring SPEAR at SLAC. Synchrotron radiation leaves the storage ring tangentially through primary beam ports, then it is split into secondary beam lines for experimental use. Currently, ten secondary beam lines on three primary beam lines can be operated simultaneously. Since the radiation levels in the beam lines are high, each secondary beam line is equipped with its own beam stoppers and equipment enclosures to provide independent operation. The design of experimental eclosures involves a consideration of the radiation type and intensity expected under different operating conditions of the storage ring. In this paper, the design considerations for the experimental enclosures and beam line safety components are discussed. In general, the synchrotron radiation is low energy and easily shielded. The dominant exposure arises from beam loss during the injection process. (orig.)