Cargando…

ATLAS Level-0 Endcap Muon Trigger for HL-LHC

The design of the Level-0 endcap muon trigger for the ATLAS experiment at High Luminosity LHC (HL-LHC) and the status of the development are presented. HL-LHC is planned to start the operation in 2027 with an instantaneous luminosity of $7.5\times 10^{34}\;\mathrm{cm^{-2}s^{-1}}$. In order to cope w...

Descripción completa

Detalles Bibliográficos
Autor principal: Mino, Yuya
Lenguaje:eng
Publicado: 2021
Materias:
Acceso en línea:https://dx.doi.org/10.22323/1.398.0753
http://cds.cern.ch/record/2784245
_version_ 1780972093056221184
author Mino, Yuya
author_facet Mino, Yuya
author_sort Mino, Yuya
collection CERN
description The design of the Level-0 endcap muon trigger for the ATLAS experiment at High Luminosity LHC (HL-LHC) and the status of the development are presented. HL-LHC is planned to start the operation in 2027 with an instantaneous luminosity of $7.5\times 10^{34}\;\mathrm{cm^{-2}s^{-1}}$. In order to cope with the proton-proton collision rate higher than that of LHC, the trigger and readout systems need to be replaced. The new Level-0 endcap muon trigger system is required to reconstruct muon candidates with an improved momentum resolution to suppress the trigger rate with keeping efficiency. That can be achieved by combining signals from various subdetectors, thin gap chambers, resistive plate chambers, micromesh gaseous detectors, and scintillator-steel hadronic calorimeters, to form more offline-like tracks. The combined muon track reconstruction was demonstrated with Monte-Carlo simulation samples produced with the condition at HL-LHC. The efficiency was estimated to be greater than 90%, a few percent higher than the current system. The trigger rate was evaluated with proton-proton collision data taken with random trigger overlaid to account for a pileup of 200, which is expected at HL-LHC. The obtained value for momentum threshold of 20 GeV, which is primary threshold assumed for single muon trigger, is less than 30 kHz. That constitutes less than 3% of the assumed total Level-0 trigger rate of 1 MHz. Hardware implementation for the trigger system is planned with ATCA blades. A Virtex UltraScale+ (XCVU13P) FPGA with 120 pairs of transceivers, which can be used to receive detector signals, and with huge memory resources suited for track reconstruction is employed for first prototype of the ATCA blade. The track reconstruction is based on a pattern matching algorithm using predefined lists of hits corresponding to tracks. The algorithm with minimal utilization of the XCVU13P FPGA resource is a major challenge. The track reconstruction firmware for full endcap coverage was provided and the implementation was successful with no timing violation by optimizing latch circuit locations and logic grouping among Super Logic Regions. The performance was evaluated with inputs from ATLAS GEANT4 full simulation. We achieved an angular resolution of less than 4 mrad, which satisfies the requirement, with less than 40% of the XCVU13P UltraRAM resources. The results constitute an important ingredients in the development of the Level-0 endcap muon trigger for HL-LHC.
id cern-2784245
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2021
record_format invenio
spelling cern-27842452022-07-27T19:12:02Zdoi:10.22323/1.398.0753http://cds.cern.ch/record/2784245engMino, YuyaATLAS Level-0 Endcap Muon Trigger for HL-LHCParticle Physics - ExperimentThe design of the Level-0 endcap muon trigger for the ATLAS experiment at High Luminosity LHC (HL-LHC) and the status of the development are presented. HL-LHC is planned to start the operation in 2027 with an instantaneous luminosity of $7.5\times 10^{34}\;\mathrm{cm^{-2}s^{-1}}$. In order to cope with the proton-proton collision rate higher than that of LHC, the trigger and readout systems need to be replaced. The new Level-0 endcap muon trigger system is required to reconstruct muon candidates with an improved momentum resolution to suppress the trigger rate with keeping efficiency. That can be achieved by combining signals from various subdetectors, thin gap chambers, resistive plate chambers, micromesh gaseous detectors, and scintillator-steel hadronic calorimeters, to form more offline-like tracks. The combined muon track reconstruction was demonstrated with Monte-Carlo simulation samples produced with the condition at HL-LHC. The efficiency was estimated to be greater than 90%, a few percent higher than the current system. The trigger rate was evaluated with proton-proton collision data taken with random trigger overlaid to account for a pileup of 200, which is expected at HL-LHC. The obtained value for momentum threshold of 20 GeV, which is primary threshold assumed for single muon trigger, is less than 30 kHz. That constitutes less than 3% of the assumed total Level-0 trigger rate of 1 MHz. Hardware implementation for the trigger system is planned with ATCA blades. A Virtex UltraScale+ (XCVU13P) FPGA with 120 pairs of transceivers, which can be used to receive detector signals, and with huge memory resources suited for track reconstruction is employed for first prototype of the ATCA blade. The track reconstruction is based on a pattern matching algorithm using predefined lists of hits corresponding to tracks. The algorithm with minimal utilization of the XCVU13P FPGA resource is a major challenge. The track reconstruction firmware for full endcap coverage was provided and the implementation was successful with no timing violation by optimizing latch circuit locations and logic grouping among Super Logic Regions. The performance was evaluated with inputs from ATLAS GEANT4 full simulation. We achieved an angular resolution of less than 4 mrad, which satisfies the requirement, with less than 40% of the XCVU13P UltraRAM resources. The results constitute an important ingredients in the development of the Level-0 endcap muon trigger for HL-LHC.ATL-DAQ-PROC-2021-012oai:cds.cern.ch:27842452021-10-15
spellingShingle Particle Physics - Experiment
Mino, Yuya
ATLAS Level-0 Endcap Muon Trigger for HL-LHC
title ATLAS Level-0 Endcap Muon Trigger for HL-LHC
title_full ATLAS Level-0 Endcap Muon Trigger for HL-LHC
title_fullStr ATLAS Level-0 Endcap Muon Trigger for HL-LHC
title_full_unstemmed ATLAS Level-0 Endcap Muon Trigger for HL-LHC
title_short ATLAS Level-0 Endcap Muon Trigger for HL-LHC
title_sort atlas level-0 endcap muon trigger for hl-lhc
topic Particle Physics - Experiment
url https://dx.doi.org/10.22323/1.398.0753
http://cds.cern.ch/record/2784245
work_keys_str_mv AT minoyuya atlaslevel0endcapmuontriggerforhllhc