The large inner Micromegas modules for the Atlas Muon Spectrometer upgrade: Construction, quality control and characterization

Allard, J.F.; Anfreville, M.; Andari, N.; Attié, D.; Aune, S.; Bachacou, H.; Balli, F.; Bauer, F.; Bennet, J.; Benoit, T.; Beltramelli, J.; Bervas, H.; Bey, T.; Bouaziz, Samir; Boyer, M.; Challey, T.; Chevalérias, T. J. A.; Coppollani, X.; Costa, José Sá da; Cara, G.; Decock, G.; Déliot, F.; Denysiuk, D.; Desforge, D.; Disset, G.; Durand, G.A.; Durand, Robert; Elman, J.; Ferrer‐Ribas, E.; Fontaine, M.; Formica, A.; Gamache, W.; Galán, J.; Giganon, A.; Giraud, J.; Giraud, P. F.; Glonti, G. L.; Goblin, C.; Graffin, P.; Guillard, J.C.; Hassani, S.; Hervé, S.; Javello, S.; Jeanneau, Fabien; Jourde, D.; Jurie, S.; Kebbiri, M.; Kawamoto, T.; Lampoudis, C.; Laporte, J. F.; Lebœuf, David; Lefevre, M.; Lohan, M.; Loiseau, C.; Magnier, P.; Mandjavidze, I.; Manjarres, Joany; Mas, P.; Mur, Marieke; Nikolaidou, Rosy; Peyaud, A.; Pierrepont, D.; Piret, Y.; Ponsot, P.; Prono, G.; Riallot, M.; Rossi, Fabiana; Schune, Philippe; Vacher, T.; Vandenbroucke, M.; Vigier, A.; Vuillemin, C.; Usseglio, M.; Wu, Z.

doi:10.1016/j.nima.2021.166143

Cited by 6 publications

(6 citation statements)

References 15 publications

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“…The counters present in Runs 1 and 2 covered the region 1.2 < |𝜂| < 1.6, while for Run 3 this coverage has been extended to 1.2 < |𝜂| < 1. 72.…”

Section: Jinst 19 P05063mentioning

confidence: 99%

“…In summary, the E3/E4 cryostat scintillators are very useful in improving the lepton energy resolution and luminosity monitoring in the region 1.2 < |𝜂| < 1. 72. New counters have been constructed for Run 3, extending the rapidity range and using the more radiation-hard scintillator described above.…”

Section: Cryostat Countersmentioning

confidence: 99%

“…The micro-mesh support pillars are deposited on top of the resistive strips in a 7 mm × 7 mm × 7 mm triangular grid. Unlike most Micromegas detectors now in operation, in the ATLAS implementation the micro-mesh is not integrated into the readout structure, but rather connected to the drift panel, and stretched across the support pillars of the readout panel by mechanical tension [71][72][73]. The precision direction of the Micromegas coincides with the bending direction of the toroidal magnetic field, while the second coordinate is determined using strips with a small stereo angle.…”

Section: Micromegas Technologymentioning

confidence: 99%

“…Lower resistance values are often found very close to the panel border, giving rise to specific discharge points in those areas. To combat this, a process of edge passivation [72][73][74] was applied to the readout panels prior to their assembly. A thin film of epoxy was applied to the active region around the border of readout panels if the measured resistance was below a defined threshold.…”

Section: Micromegas Technologymentioning

confidence: 99%

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The ATLAS experiment at the CERN Large Hadron Collider: a description of the detector configuration for Run 3

Aad,

Abbott,

Abbott

et al. 2024

J. Inst.

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The ATLAS detector is installed in its experimental cavern at Point 1 of the CERN Large Hadron Collider. During Run 2 of the LHC, a luminosity of ℒ = 2 × 1034 cm-2 s-1 was routinely achieved at the start of fills, twice the design luminosity. For Run 3, accelerator improvements, notably luminosity levelling, allow sustained running at an instantaneous luminosity of ℒ = 2 × 1034 cm-2 s-1, with an average of up to 60 interactions per bunch crossing. The ATLAS detector has been upgraded to recover Run 1 single-lepton trigger thresholds while operating comfortably under Run 3 sustained pileup conditions. A fourth pixel layer 3.3 cm from the beam axis was added before Run 2 to improve vertex reconstruction and b-tagging performance. New Liquid Argon Calorimeter digital trigger electronics, with corresponding upgrades to the Trigger and Data Acquisition system, take advantage of a factor of 10 finer granularity to improve triggering on electrons, photons, taus, and hadronic signatures through increased pileup rejection. The inner muon endcap wheels were replaced by New Small Wheels with Micromegas and small-strip Thin Gap Chamber detectors, providing both precision tracking and Level-1 Muon trigger functionality. Trigger coverage of the inner barrel muon layer near one endcap region was augmented with modules integrating new thin-gap resistive plate chambers and smaller-diameter drift-tube chambers. Tile Calorimeter scintillation counters were added to improve electron energy resolution and background rejection. Upgrades to Minimum Bias Trigger Scintillators and Forward Detectors improve luminosity monitoring and enable total proton-proton cross section, diffractive physics, and heavy ion measurements. These upgrades are all compatible with operation in the much harsher environment anticipated after the High-Luminosity upgrade of the LHC and are the first steps towards preparing ATLAS for the High-Luminosity upgrade of the LHC. This paper describes the Run 3 configuration of the ATLAS detector.

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“…The counters present in Runs 1 and 2 covered the region 1.2 < |𝜂| < 1.6, while for Run 3 this coverage has been extended to 1.2 < |𝜂| < 1. 72.…”

Section: Jinst 19 P05063mentioning

confidence: 99%

Section: Cryostat Countersmentioning

confidence: 99%

Section: Micromegas Technologymentioning

confidence: 99%

Section: Micromegas Technologymentioning

confidence: 99%

See 2 more Smart Citations

The ATLAS experiment at the CERN Large Hadron Collider: a description of the detector configuration for Run 3

Aad,

Abbott,

Abbott

et al. 2024

J. Inst.

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show abstract

“…The system was designed to provide tracking and trigger capability for muons in the high luminosity LHC era, requiring: spatial resolution of 100 μm, efficiency > 97%, 25 ns bunch-crossing identification, rate capability of 20 kHz/cm 2 . A detailed description of the design and construction of the Micromegas detector modules for ATLAS can be found in [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

The industrial production of Micro Pattern Gaseous Detector: experience from the ATLAS Micromegas

Iengo

2023

J. Inst.

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Resistive Micromegas is one of the detector technologies chosen by ATLAS for the Phase-1 upgrade of the Muon Spectrometer, completed in 2022 in view of the LHC Run3 start. It is the largest MPGD-based detector system ever built, covering an active area of 1280 m2, providing trigger and precise tracking capabilities to the ATLAS Muon system and able to stand a radiation background rate up to 20 kHz/cm2. The heart of the ATLAS Micromegas detectors is the anode board, which carries the resistive protection layer, the readout electrodes and the insulating spacers supporting the micro-mesh. The production of the 2048 readout boards of size up to 0.5×2.2 m2 has been assigned to high-technology PCB industries and required dedicated efforts for technology transfer, production follow-up and quality assurance and control. The paper reviews the main challenges from the design phase to the completion of the project which spanned over several years. Emphasis is also put on the thorough quality assurance and quality control protocol established, the achieved results, as well as on the logistic, supply and schedule constraints. The lessons learned from this unprecedented MPGD project are also discussed.

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Construction and test of the SM1 type Micromegas chambers for the upgrade of the ATLAS forward muon spectrometer

Agarwala

Alviggi

Antonelli

et al. 2022

Nuclear Instruments and Methods in Physics Research Section A:

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The large inner Micromegas modules for the Atlas Muon Spectrometer upgrade: Construction, quality control and characterization

Cited by 6 publications

References 15 publications

The ATLAS experiment at the CERN Large Hadron Collider: a description of the detector configuration for Run 3

The ATLAS experiment at the CERN Large Hadron Collider: a description of the detector configuration for Run 3

The industrial production of Micro Pattern Gaseous Detector: experience from the ATLAS Micromegas

Construction and test of the SM1 type Micromegas chambers for the upgrade of the ATLAS forward muon spectrometer

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