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The Spallation Neutron Source (SNS) is a megawatt class hadron accelerator. Beam loss monitoring is essential for machine protection, residual activation control and machine tuning. We discuss all parts of our beam loss monitoring system including its detectors, electronics, machine protection system (MPS) interface and its role in the accelerator tuning process. The system was designed more than 10 years ago, so we are now addressing obsolescence problems by designing a new FPGA based replacement. The plans for this next generation BLM system are presented.
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