Abstract

The ATLAS Central Trigger Processor (CTP) is responsible for forming the Level-1 trigger decision based on the information from the calorimeter and muon trigger processors. In order to cope with the increase of luminosity and physics cross-sections in Run 2, several components of this system have been upgraded. In particular, the number of usable trigger inputs and trigger items have been increased from 160 to 512 and from 256 to 512, respectively. The upgraded CTP also provides extended monitoring capabilities and allows to operate simultaneously up to three independent combinations of sub-detectors with full trigger functionality, which is particularly useful for commissioning, calibration and test runs. The software has also undergone a major upgrade to take advantage of all these new functionalities. An overview of the commissioning and the operation of the upgraded CTP during the LHC Run 2 is given.

Highlights

  • This content has been downloaded from IOPscience

  • : The ATLAS Central Trigger Processor (CTP) is responsible for forming the Level-1 trigger decision based on the information from the calorimeter and muon trigger processors

  • Prototypes of all upgraded CTP modules were successfully tested in the laboratory and the final boards installed in the ATLAS cavern at the end of 2014

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Summary

Overview of the Level-1 trigger system

A schematic of the upgraded L1 trigger system is shown in figure 1. Information from the electromagnetic and hadronic calorimeters are processed by the L1Calo system. This uses coarse granularity calorimeter towers to identify electrons, photons, taus and jets, and provides a count of the number of objects above various energy thresholds as well as the transverse energy sum and missing transverse energy. The Muon-to-CTP Interface (MUCTPI) [5] is composed of 16 Muon Interface Octant (MIOCT) modules. It receives trigger information from 208 L1Muon sectors, calculates the multiplicity of muon candidates for up to six momentum thresholds, and sends them to the CTP. The CTP forms the L1-Accept (L1A) signal and transmit it to the sub-detectors

Upgrade of the Central Trigger Processor
Central Trigger Processor software
Commissioning of the Central Trigger Processor
Conclusion

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