Jitter of L1 Trigger: Simulation Results
Overview
The most interesting quantity for reconstruction which the trigger produces is the time of the Level 1 Accept. The simulation produces the FcsSimOut digi, which contains the time of the Level 1 Accept relative to GEANT physics time. Due to the nature of
the trigger and detectors used to produce a trigger, there is some inherent jitter of the time of the Level 1 Accept.
The maximum jitter allowed in the Level 1 Accept is 60 times the period of the 60 MHz clock, or just over 1 us; the full latency and jitter specification can be found under
/BFROOT/www/Detector/Trigger/96/latency-jitter/
Simulation Output
The simulation of the L1 trigger reports the event time through the FcsDigi with a jitter of 180 ns for B events, and a jitter of 330 ns for tau events (at the 99% confidence level), both well under the specification. Plots of the jitter are available for
both B events and Tau events. |
