Sep 25 – 29, 2006
Valencia, Spain
Europe/Zurich timezone

The Octant Module of the ATLAS Level-1 Muon to Central Trigger Processor Interface

Sep 26, 2006, 4:45 PM
25m
Valencia, Spain

Valencia, Spain

IFIC – Instituto de Fisica Corpuscular Edificio Institutos de Investgación Apartado de Correos 22085 E-46071 València SPAIN

Speaker

Stefan Haas (CERN)

Description

The Muon to Central Trigger Processor Interface (MUCTPI) of the ATLAS Level-1 trigger receives data from the sector logic modules of the muon trigger at every bunch crossing and calculates the total multiplicity of muon candidates, which is then sent to the Central Trigger Processor (CTP) where the final Level-1 decision is taken. The MUCTPI system consists of a 9U VME crate with a special backplane and 18 custom designed modules. We focus on the design and implementation of the octant module (MIOCT). Each of the 16 MIOCT modules processes the muon candidates from 13 sectors of the muon trigger and forms the local muon candidate multiplicities for the trigger decision. It also resolves the overlaps between chambers in order to avoid double-counting of muon candidates that are detected in more than one sector. The handling of overlapping sectors is based on Look-Up-Tables (LUT) for maximum flexibility. The MIOCT also sends the information on the muon candidates over the custom backplane via the Readout Driver module to the Level-2 trigger and the DAQ systems when a level 1 accept is received. The design is based on state-of-the-art FPGA devices and special attention was paid to low-latency in the data transmission and processing.

Summary

The Muon to Central Trigger Processor Interface (MUCTPI) of the ATLAS Level-1 trigger
receives data from the sector logic modules of the muon trigger at every bunch
crossing and calculates the total multiplicity of muon candidates, which is then sent
to the Central Trigger Processor (CTP) where the final Level-1 decision is taken. The
MUCTPI system consists of a 9U VME crate with a special backplane and 18 custom
designed modules. We focus on the design and implementation of the octant module
(MIOCT). Each of the 16 MIOCT modules processes the muon candidates from 13 sectors
of the muon trigger and forms the local muon candidate multiplicities for the trigger
decision. It also resolves the overlaps between chambers in order to avoid
double-counting of muon candidates that are detected in more than one sector. The
handling of overlapping sectors is based on Look-Up-Tables (LUT) for maximum
flexibility. The MIOCT also sends the information on the muon candidates over the
custom backplane via the Readout Driver module to the Level-2 trigger and the DAQ
systems when a level 1 accept is received. The design is based on state-of-the-art
FPGA devices and special attention was paid to low-latency in the data transmission
and processing.

Primary authors

Presentation materials