Abstract

The Muon to Central Trigger Processor Interface (MUCTPI) of the ATLAS experiment at the Large Hadron Collider(LHC) at CERN is being upgraded for the next run of the LHC in order to use optical inputs and to provide full-precision information for muon candidates to the topological trigger processor (L1TOPO) of the Level-1 trigger system. The new MUCTPI is implemented as a single ATCA blade with high-end processing FPGAs which eliminate doublecounting of muon candidates in overlapping regions, send muon candidates to L1TOPO, and muon multiplicities tothe Central Trigger Processor (CTP), as well as readout data to the data acquisition system of the experiment. A Xilinx Zynq System-on-Chip (SoC) with a programmable logic part and a processor part is used for the communication to the processing FPGAs and the run control system. The processor part, based on ARM processor cores, is running embedded Linux prepared using the framework of the Linux Foundation's Yocto project. The ATLAS run control software was ported to the processor part and a run control application was developed which receives, at configuration, all data necessary for the overlap handling and candidate counting of the processing FPGAs. During running, the application provides ample monitoring of the physics data and of the operation of the hardware. *

Highlights

  • The ATLAS Experiment at the LHCThe ATLAS experiment is a general-purpose experiment at the Large Hadron Collider (LHC) at CERN [1]

  • The first-level trigger of the ATLAS experiment uses reduced-granularity information from the calorimeters and dedicated muon trigger detectors, see Figure 1

  • The Muon to Central Trigger Processor Interface (MUCTPI) combines the muon candidate counts from the Resistive Plate Chambers (RPC) and Thin-Gap Chambers (TGC), taking into account double counting of single muons that are detected by more than one chamber due to geometrical overlap of the muon chambers and the trajectory of the muon in the magnetic field

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Summary

The ATLAS Experiment at the LHC

The ATLAS experiment is a general-purpose experiment at the Large Hadron Collider (LHC) at CERN [1]. The ATLAS trigger system consists of a Level-1 trigger based on custom electronics, which reduces the event rate to a maximum of 100 kHz, and a high-level trigger system based on commercial computers, which reduces the event rate to around 1 kHz on average

The Level-1 Trigger System
The Upgrade of the MUCTPI
The ATLAS Run Control on a System-on-Chip
Cross Compile Run Control
Operate Run Control on the SoC
Summary
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