Abstract
The Large Area Telescope (LAT) is the primary instrument on the Gamma Ray Large Area Space Telescope (GLAST), a space based observatory which is scheduled to launch late this year. The LAT traces its heritage from the particle physics community and represents a large departure in design and capability from previous space based experiments. Similarly, power, communication, and physical access limitations of a space based platform place strict requirements on the design and reliability of both the LAT and its Trigger and Dataflow (T&DF) system. The resulting T&DF system consists of a hierarchical trigger with both Level 0 and Level 3 components, distributed event processing, and slow control. We describe our experiences developing and testing the T&DF system in the context of a space mission, and we report the performance and status of the system as GLAST approaches launch.
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