FIR Filter Study

Digital Filtering Performance in the ATLAS Level-1 Calorimeter TriggerDavid Hadleyon behalf of the ATLAS CollaborationATLAS Trigger and L1Calo Architecture

Digital Filter Implementation

Digital Filter PerformanceOutlineATLAS Trigger and L1Calo Architecture ATLAS TriggerATLAS three level trigger:Level 1 : hardware-based, pipelined with a fixed latency threshold.Hadronic and e.m. isolation requirements in surrounding towers.

e/gamma and /hadronJet and energy-sum

ECAL+HCALOperates on jet elements 2x2 towers.Energy in window (EM+Had) > threshold.Variable window size.Same module does total-ET and missing-ET triggers.Double counting is avoided by requiring a local ET maximum.26/05/201024Digital Filter Performance - David Hadley - RT2010