Abstract

The ATLAS level-1 muon trigger will be crucial for the online selection of events with high transverse momentum muons and for its correct association to the bunch-crossing corresponding to the detected events. This system uses dedicated coarse granularity and fast detectors capable of providing measurements in two orthogonal projections. The resistive plate chambers (RPCs) are used in the barrel region (|/spl eta/| < 1). The associated trigger electronics is based on a custom chip, the coincidence matrix, that performs space coincidences within programmable roads and time gates. The system is highly redundant and communicates with the ATLAS level-1 trigger processor with the MUCTPI interface. The trigger electronics provides also the readout of the RPCs. Preliminary results achieved with a full trigger tower with production detectors in the H8 test beam at CERN will be shown, in particular preliminary results on the integration of the barrel muon trigger electronics with the MUCTPI interface and with the ATLAS DAQ system will be discussed.

Highlights

  • M AIN goal of the ATLAS First-Level Trigger [1] is to reduce the trigger rate by a factor of ¥ (¦ ̈§© ) from the initial bunch-crossing rate of 40 MHz, while eliminating accidental triggers due to low energy background particles. It is based on multiplicity information from clusters found in the calorimeters and from tracks found in dedicated muon trigger detectors

  • The Muon Trigger system in the Barrel region is based on three stations of double gaps Resistive Plate Chambers (RPCs)

  • An external Trigger and Timing Control system (TTC) forms the Level-1 Accept (L1A) signal based on the global ATLAS trigger result produced by the CTP

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Summary

INTRODUCTION

M AIN goal of the ATLAS First-Level Trigger [1] is to reduce the trigger rate by a factor of ¥ (¦ ̈§© ) from the initial bunch-crossing rate of 40 MHz, while eliminating accidental triggers due to low energy background particles. It is based on multiplicity information from clusters found in the calorimeters and from tracks found in dedicated muon trigger detectors. The trigger detectors segmentation unit is the sector, which can identify up to two muon candidates classified using six programmable thresholds.

MUON BARREL TRIGGER OVERVIEW
On-detector electronics
Off-detector electronics
TEST BEAM SETUP
READOUT SLICE PERFORMANCES
TRIGGER SLICE PERFORMANCES
TRIGGER LATENCY EXTRAPOLATION
VIII. CONCLUSIONS

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