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DOE OSTI · 1423267

NOvA Event Building, Buffering and Data-Driven Triggering From Within the DAQ System

Fischler, M.·Green, C.·Kowalkowski, J.·Norman, A.·Paterno, M.·Rechenmacher, R.
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Abstract

To make its core measurements, the NOvA experiment needs to make real-time data-driven decisions involving beam-spill time correlation and other triggering issues. NOvA-DDT is a prototype Data-Driven Triggering system, built using the Fermilab artdaq generic DAQ/Event-building tools set. This provides the advantages of sharing online software infrastructure with other Intensity Frontier experiments, and of being able to use any offline analysis module--unchanged--as a component of the online triggering decisions. The NOvA-artdaq architecture chosen has significant advantages, including graceful degradation if the triggering decision software fails or cannot be done quickly enough for some fraction of the time-slice ``events.'' We have tested and measured the performance and overhead of NOvA-DDT using an actual Hough transform based trigger decision module taken from the NOvA offline software. The results of these tests--98 ms mean time per event on only 1/16 of th e available processing power of a node, and overheads of about 2 ms per event--provide a proof of concept: NOvA-DDT is a viable strategy for data acquisition, event building, and trigger processing at the NOvA far detector.

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Fischler, M., Green, C., Kowalkowski, J., Norman, A., Paterno, M., Rechenmacher, R.. 2012-06-22. NOvA Event Building, Buffering and Data-Driven Triggering From Within the DAQ System. https://doi.org/10.1088/1742-6596%2F396%2F1%2F012020

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