Speaker
Mr
Riccardo Vari
(Istituto Nazionale di Fisica Nucleare (INFN))
Description
The ATLAS Barrel Level-1 muon trigger handles data coming from the Resistive Plate
Chamber detectors, structured in three concentric layers inside the air-core barrel
toroid. The trigger classifies muons within different programmable transverse
momentum thresholds, and tags the identified tracks with the corresponding bunch
crossing number. The algorithm looks for hit coincidences within different detector
layers inside the programmed geometrical road which defines the transverse momentum
cut. The Coincidence Matrix ASIC implements the trigger algorithm and the readout
of the RPC detector, processing hit signals coming from up to four detector layers.
It finds muon track candidates and generates the output trigger patterns within a
latency of a few 25 ns bunch crossing periods, and produces and time tags the
readout hit patterns. Due to the different performance needs and limitations in the
technology, the CMA input pipeline and trigger logic and the time interpolator run
at the working frequency of 320 MHz, the readout part works at 160 MHz while the
control part works at 40 MHz. Performances of the ASIC have been studied on
different test station, the test results are presented.
Author
Mr
Riccardo Vari
(Istituto Nazionale di Fisica Nucleare (INFN))
