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We discuss the design, implementation and performance of the radiationmonitoring and protection system used by the Silicon Vertex Tracker (SVT) inthe BaBar detector. Using 12 reverse-biased PIN photodiodes mounted around thebeampipe near the IP, we are able to provide instantaneous radiation doserates, absorbed dose integrals, and active protection that aborts thecirculating beams in the PEP-II storage ring when radiation levels exceeduser-defined thresholds. The system has reliably protected the SVT fromexcessive radiation damage and has also served as a key diagnostic tool inunderstanding radiation backgrounds at PEP-II.

PIN PHOTODIODES FOR RADIATION MONITORING AND PROTECTION IN THE BABAR SILICON VERTEX TRACKER