Gas System for the ATLAS NSW Micromegas Detectors: Design Aspects and Advanced Validation Methods for their QA/QC

Alexopoulos, T.; Gazis, E. N.; Maltezos, S.; Antoniou, A.; Gika, V.; Karentzos, S.; Koulouris, A.; Koutelieris, G.; Moschovakos, Paraschos

doi:10.12681/hnps.1839

Cited by 3 publications

(3 citation statements)

References 1 publication

(1 reference statement)

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“…is the empirical elastic model we used [17]. The numerical values of the parameters that we used for calculating the gas leak rate of the Micromegas of LM2-type, as a function of the squeezing pressure, are the following:…”

Section: Calculation Methods and Detailsmentioning

confidence: 99%

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Determination of the Feasible Gas Sealing Performance of the NSW Micromegas Quadruplets

Maltezos,

Alexopoulos,

Gazis

et al. 2024

Preprint

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The New Small wheel Micromegas quadruplets for the LHC-ATLAS Upgrade of phase-I has been completed and already installed on the ATLAS detector. After their construction a quality assurance and checking were performed in the Lab BB5 at CERN. The Quadruplets must be sufficiently sealed in order to accomplish a stable operation and avoiding excessive gas mixture leakage. The theoretical prediction of the gas leak rate is the main the goal of this work and is based on the Contact Mechanics and Percolation Theories. The surface topography analysis and the rubber cord properties have been also taken into account. In this context, the experimental gas leak tightness test to a Micromegas prototype module is presented for obtaining a prior benchmark before the integration of the quadruplets.

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Section: Calculation Methods and Detailsmentioning

confidence: 99%

“…Therefore, for the FR4 we have set, h 0,A = 0.703 µm. For the roll-off wavevector modulus, corresponding to the inverse-power law region, we have set q 0 = 9.6157 × 10 4 [17]. Our methodology has been organized according to the building block scheme shown in Fig.…”

Section: Calculation Methods and Detailsmentioning

confidence: 99%

Determination of the Feasible Gas Sealing Performance of the NSW Micromegas Quadruplets

Maltezos,

Alexopoulos,

Gazis

et al. 2024

Preprint

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“…The system is calibrated by using a set of high precision needles and the data set is corrected in terms of temperature variations. A detailed description of the gas tightness system and procedure is given in [8].…”

Section: Modules Test Validation and Integration At Cernmentioning

confidence: 99%

Micromegas chambers for the ATLAS New Small Wheel upgrade

Gnesi

2020

J. Inst.

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The ATLAS collaboration at LHC has chosen the resistive Micromegas technology, along with the small-strip Thin Gap Chambers (sTGC), for the high luminosity upgrade of the first muon station in the high-rapidity region, the so called New Small Wheel (NSW) project. After the R&D, design and prototyping phase, the series production Micromegas quadruplets are being constructed at the involved construction sites in France, Germany, Italy, Russia and Greece. At CERN, the final validation and the integration of the modules in Sectors are in progress. The installation of the first NSW, the NSW-A is foreseen for the LHC long shutdown in 2020. The construction of the four types of large size quadruplets, all having trapezoidal shapes with surface areas between 2 and 3 m2, 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. The encountered problems will be described, to a large extent common to other micro-pattern gaseous detectors, along with the adopted solutions. Final quality assessment and validation results on the achieved mechanical precision, on the High-Voltage stability during operation with and without irradiation will be reviewed together with the most relevant steps and results of the modules integration into sectors.

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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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Gas System for the ATLAS NSW Micromegas Detectors: Design Aspects and Advanced Validation Methods for their QA/QC

Cited by 3 publications

References 1 publication

Determination of the Feasible Gas Sealing Performance of the NSW Micromegas Quadruplets

Determination of the Feasible Gas Sealing Performance of the NSW Micromegas Quadruplets

Micromegas chambers for the ATLAS New Small Wheel upgrade

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

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