Trigger Data Acquisition

Argonne and MSU have taken responsibility for the Level 2 Supervisor and Region-of-Interest Builder components of the Level 2 trigger. These custom electronics boards route a subset of the information from the detector system to the ATLAS High Level Trigger. The trigger system as a whole reduces the input event rate from 100kHz to a few kHz on the basis of the information from the RoIB and eventually, following further processing, to ~200 Hz for storage and physics analysis. The group works on Felix, C-RORC, and L1track for Phase-II.