Personnel protection and beam containment systems for the 3 GeV injector

The 3-GeV injector is the electron beam source for the Stanford Positron-Electron Asymmetric Ring (SPEAR) storage ring, and its personnel safety system was designed to protect personnel from both radiation exposure and electrical hazards. The personnel protection system (PPS) was designed and implemented with complete redundancy and is a relay-based interlock system completely independent from the machine protection system. Comprehensive monitoring of the system status and control of the injector PPS from the SPEAR control room via the control computer is a feature. The beam containment system (BCS) is based on beam current measurements along the linear accelerators (LINACs) and on beam shut-off ion chambers installed outside the LINAC, at several locations around the booster, and around the SPEAR storage ring. An outline of the design criteria is presented with a more detailed description of the philosophy of the PPS logic and the BCS.<
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