Micromegas chambers for the ATLAS New Small Wheel upgrade

Gnesi, I.

doi:10.1088/1748-0221/15/09/c09019

Cited by 9 publications

(4 citation statements)

References 13 publications

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“…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%

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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Section: Micromegas Technologymentioning

confidence: 99%

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

“…All the rest have followed this procedure. More details on the passivation procedure can be found at [6].…”

Section: High Voltage Stabilitymentioning

confidence: 99%

Large size multi-gap resistive Micromegas for the ATLAS New Small Wheel at CERN

Fassouliotis¹

2021

Proceedings of 40th International Conference on High Energy Physics — PoS(ICHEP2020)

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Large size multi-gap resistive strips Micromegas have been chosen together with the smallstrips TGC (sTGC) to be mounted on the New Small Wheel (NSW) upgrade of the ATLAS Muon Spectrometer. The NSW is the most ambitious and challenging upgrade of the ATLAS experiment for LHC-Phase1 (the current long shutdown) and will exploit its full capabilities after the Phase2 upgrade of LHC when the luminosity will reach values up to 7.5 × 10 34 cm −2 s −1 severely impacting on the ATLAS muon forward reconstruction and trigger. Four types of large size quadruplets Micromegas detectors are currently in series production in France, Germany, Italy, Russia and Greece. At CERN the integration of the modules and their assembly in sectors composing the wheel is well advanced. All the procedures of quality control are in place and steadily running. In this presentation the main challenges of the project will be reviewed. The achievement of the requirements for these detectors revealed to be even more challenging than expected, when scaling from the small prototypes to the large dimensions. We will describe the encountered problems, to a large extent common to other micro-pattern gaseous detectors, and the adopted solutions. In addition, the work of the integration of the detectors at CERN and the results from the validation tests at CERN on Micromegas sectors in their final configuration, will be also presented.

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“…A big step in the direction of the industrial and cost-effective manufacting of MPGDs was the development of the new fabrication technologies -resistive MM [79], to suppress destructive sparks in hadron environments, single-mask and self-stretching GEM techniques [80], which enable production of large-size foils and significantly reduce detector assembly time. Scaling up MPGD detectors, while preserving the typical properties of small prototypes, allowed their use in the LHC experiments after LS2 (Micromegas [81] in combination with Thin Gap chambers [82] in the ATLAS New Small Wheel, GEMs in the CMS Muon System [83] and in the ALICE TPC). In addition, wire-chamber based photon detectors of COMPASS RICH-1 have been replaced by hybrid MPGDs -staggered THGEM and a MM multiplication stage with CsI photocathodes -to accomplish the delicate mission of single photon detection (see section 5).…”

Section: Gaseous Detectorsmentioning

confidence: 99%

Next frontiers in particle physics detectors: INSTR2020 summary and a look into the future

Titov¹

2020

J. Inst.

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The physics goals of high luminosity particle accelerators, from LHC to HL-LHC and to the next generation of lepton colliders, have set quite stringent constraints on the future needs at the Instrumentation Frontier. Many technologies are reaching their sensitivity limit and new approaches need to be developed to overcome the currently irreducible technological challenges. The detrimental effect of the material budget and power consumption represents a very serious concern for a high-precision silicon vertex and tracking detectors. One of the most promising areas is CMOS sensors offering low mass and potentially radiation-hard technology for the future proton-proton and electron-positron colliders, intensity frontier and heavy-ion experiments. MPGDs have become a well-established technique in the fertile field of gaseous detectors; these will remain the primary choice whenever the large-area coverage with low material budget is required. Vacuum tube technology is inherently fast and new developments include advances in microchannel plates for photomultipliers with a potential for a picosecondtime resolution in large systems. Several novel concepts of picosecond-timing detectors will have numerous powerful applications in particle identification, pile-up rejection and event reconstruction, and serve numerous scientific goals. The story of modern calorimetry is a textbook example of physics research driving the development of an experimental method. Silicon photomultipliers have seen a rapid progress in the last decade, becoming the standard solution for scintillator-based devices. The integration of advanced electronics and data transmission functionalities plays an increasingly important role and needs to be addressed. Bringing the modern algorithmic advances from the field of machine learning from offline applications to online operations and trigger systems is another major challenge. The timescales spanned by future projects in particle physics, ranging from few years to many decades, constitute a challenge in itself, in addition to the complexity and diversity of the required accelerator and detector R&D. This paper summarizes advances and recent trends in the instrumentation techniques for particle physics experiments, largely based on the presentations given at the International Conference "Instrumentation for Colliding Beam Physics" (INSTR-20), held at BINP Novosibirsk, Russia, from 24 to

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Micromegas chambers for the ATLAS New Small Wheel upgrade

Cited by 9 publications

References 13 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

Large size multi-gap resistive Micromegas for the ATLAS New Small Wheel at CERN

Next frontiers in particle physics detectors: INSTR2020 summary and a look into the future

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