Investigation and Mitigation of Crosstalk in the Prototype ME0 GEM Detector for the Phase-2 Muon System Upgrade of the CMS Experiment

The LHe is currently undergoing a high luminosity upgrade, which is set to increase the instantaneous luminosity by at least a factor of five. This luminosity increase will result in a higher muon flux rate in the forward region and overwhelm the current trigger system of the CMS experiment. The MEO...

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Autores principales: Butalla, Stephen D., Hohlmann, Marcus
Lenguaje:eng
Publicado: 2021
Materias:
Acceso en línea:https://dx.doi.org/10.1109/NSS/MIC42677.2020.9508058
http://cds.cern.ch/record/2751425
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author Butalla, Stephen D.
Hohlmann, Marcus
author_facet Butalla, Stephen D.
Hohlmann, Marcus
author_sort Butalla, Stephen D.
collection CERN
description The LHe is currently undergoing a high luminosity upgrade, which is set to increase the instantaneous luminosity by at least a factor of five. This luminosity increase will result in a higher muon flux rate in the forward region and overwhelm the current trigger system of the CMS experiment. The MEO, a gas electron multiplier detector, is proposed for the Phase-2 Muon System Upgrade for the CMS experiment to help increase the muon acceptance and to control the Level 1 muon trigger rate. A recent design iteration of this detector features GEM foils that are segmented on both sides, which helps to lower the probability of high voltage discharges. However, during preliminary testing of the chamber, substantial crosstalk between readout sectors was observed. Here, we investigate, characterize, and quantify the crosstalk present in the detector, and also estimate the performance of the chamber as a result of this crosstalk via simulation results of the detector dead time, efficiency loss, and frontend electronics response. The results of crosstalk via signals produced by applying a square voltage pulse directly on the readout strips of the detector with a signal generator are summarized. We also present the efficacy of mitigation strategies including bypass capacitors and increasing the area of the HV segments on the third GEM foil in the detector. We find that the crosstalk is a result of capacitive coupling between the readout strips on the readout board and between the readout strips and the bottom of the third GEM foil. Our results show that the crosstalk generally follows a pattern where the largest magnitude of crosstalk is within the same azimuthal readout segment in the detector, and in the next-nearest horizontal segments in eta. Generally, the bypass capacitors and increased area of the HV segments successfully lower the crosstalk in the sectors where they are located; on average, we observe a maximum decrease of crosstalk in sectors previously experiencing crosstalk from (1.66±0.03)% to (1.11±0.02)% with all HV segments connected in parallel on the bottom of the third GEM foil, with the addition of an HV low-pass filter connected to this electrode, and an HV divider. However, with these mitigation strategies, we also observe slightly increased crosstalk (≨ 0.4%) in readout sectors farther away.
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spelling cern-27514252023-03-14T19:07:34Zdoi:10.1109/NSS/MIC42677.2020.9508058http://cds.cern.ch/record/2751425engButalla, Stephen D.Hohlmann, MarcusInvestigation and Mitigation of Crosstalk in the Prototype ME0 GEM Detector for the Phase-2 Muon System Upgrade of the CMS Experimenthep-exParticle Physics - Experimentphysics.ins-detDetectors and Experimental TechniquesThe LHe is currently undergoing a high luminosity upgrade, which is set to increase the instantaneous luminosity by at least a factor of five. This luminosity increase will result in a higher muon flux rate in the forward region and overwhelm the current trigger system of the CMS experiment. The MEO, a gas electron multiplier detector, is proposed for the Phase-2 Muon System Upgrade for the CMS experiment to help increase the muon acceptance and to control the Level 1 muon trigger rate. A recent design iteration of this detector features GEM foils that are segmented on both sides, which helps to lower the probability of high voltage discharges. However, during preliminary testing of the chamber, substantial crosstalk between readout sectors was observed. Here, we investigate, characterize, and quantify the crosstalk present in the detector, and also estimate the performance of the chamber as a result of this crosstalk via simulation results of the detector dead time, efficiency loss, and frontend electronics response. The results of crosstalk via signals produced by applying a square voltage pulse directly on the readout strips of the detector with a signal generator are summarized. We also present the efficacy of mitigation strategies including bypass capacitors and increasing the area of the HV segments on the third GEM foil in the detector. We find that the crosstalk is a result of capacitive coupling between the readout strips on the readout board and between the readout strips and the bottom of the third GEM foil. Our results show that the crosstalk generally follows a pattern where the largest magnitude of crosstalk is within the same azimuthal readout segment in the detector, and in the next-nearest horizontal segments in eta. Generally, the bypass capacitors and increased area of the HV segments successfully lower the crosstalk in the sectors where they are located; on average, we observe a maximum decrease of crosstalk in sectors previously experiencing crosstalk from (1.66±0.03)% to (1.11±0.02)% with all HV segments connected in parallel on the bottom of the third GEM foil, with the addition of an HV low-pass filter connected to this electrode, and an HV divider. However, with these mitigation strategies, we also observe slightly increased crosstalk (≨ 0.4%) in readout sectors farther away.The LHC is undergoing a high luminosity upgrade, which is set to increase the instantaneous luminosity by at least a factor of five, resulting in a higher muon flux rate in the forward region, which will overwhelm the current trigger system of the CMS experiment. The ME0, a gas electron multiplier detector, is proposed for the Phase-2 Muon System Upgrade to help increase the muon acceptance and to control the Level 1 muon trigger rate. To lower the probability of HV discharges, the ME0 was designed with GEM foils that are segmented on both sides. Initial testing of the ME0 showed substantial crosstalk between readout sectors. Here, we investigate, characterize, and quantify the crosstalk in the detector, and estimate the performance of the chamber as a result of this crosstalk via simulation of the detector dead time, efficiency loss, and frontend electronics response. The results of crosstalk via signals produced by applying a square voltage pulse directly on the readout strips of the detector with a pulser are summarized, and the efficacy of various mitigation strategies are presented. The crosstalk is a result of capacitive coupling between the readout strips on the readout board and between the readout strips and the bottom of GEM3. The crosstalk also generally follows a pattern where the largest magnitude of crosstalk is within the same azimuthal readout segment in the detector and in the nearest horizontal segments. The use of bypass capacitors and larger HV segments successfully reduce the crosstalk: we observe a maximum decrease of crosstalk in sectors previously experiencing crosstalk from $(1.66\pm0.03)\%$ to $(1.11\pm0.02)\%$ with all HV segments connected in parallel on the bottom of GEM3, with an HV low-pass filter, and an HV divider. These mitigation strategies slightly increase crosstalk $\big(\hspace{-0.1cm}\lessapprox 0.4\%\big)$ in readout sectors farther away.arXiv:2102.03342oai:cds.cern.ch:27514252021-02-05
spellingShingle hep-ex
Particle Physics - Experiment
physics.ins-det
Detectors and Experimental Techniques
Butalla, Stephen D.
Hohlmann, Marcus
Investigation and Mitigation of Crosstalk in the Prototype ME0 GEM Detector for the Phase-2 Muon System Upgrade of the CMS Experiment
title Investigation and Mitigation of Crosstalk in the Prototype ME0 GEM Detector for the Phase-2 Muon System Upgrade of the CMS Experiment
title_full Investigation and Mitigation of Crosstalk in the Prototype ME0 GEM Detector for the Phase-2 Muon System Upgrade of the CMS Experiment
title_fullStr Investigation and Mitigation of Crosstalk in the Prototype ME0 GEM Detector for the Phase-2 Muon System Upgrade of the CMS Experiment
title_full_unstemmed Investigation and Mitigation of Crosstalk in the Prototype ME0 GEM Detector for the Phase-2 Muon System Upgrade of the CMS Experiment
title_short Investigation and Mitigation of Crosstalk in the Prototype ME0 GEM Detector for the Phase-2 Muon System Upgrade of the CMS Experiment
title_sort investigation and mitigation of crosstalk in the prototype me0 gem detector for the phase-2 muon system upgrade of the cms experiment
topic hep-ex
Particle Physics - Experiment
physics.ins-det
Detectors and Experimental Techniques
url https://dx.doi.org/10.1109/NSS/MIC42677.2020.9508058
http://cds.cern.ch/record/2751425
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