GEM based detector for future upgrade of the CMS forward muon system

Abbaneo, D.; Armagnaud, C.; Abbrescia, M.; Aspell, P.; Bally, S.; Ban, Y.; Benussi, L.; Berzano, U.; Bianco, S.; Bos, J.; Buńkowski, K.; Cai, J.; Chatelain, J. P.; Christiansen, J.; Colafranceschi, S.; Colaleo, A.; Garcia, A. Conde; David, E.; Oliveira, Rui de; Robertis, G. De; Lentdecker, G. De; Pinto, S. Duarte; Ferry, S.; Formenti, F.; Franconi, L.; Fruboes, T.; Gnanvo, K.; Gutiérrez, A.; Yang, Yifan; Hohlmann, M.; Karchin, P. E.; Loddo, F.; Maerschalk, T.; Magazzù, G.; Maggi, M.; Marchioro, A.; Marinov, A.; Mehta, K.; Merlin, J. A.; Nemallapudi, Mythra Varun; Mohapatra, A.; Moulik, T.; Nuzzo, S.; Oliveri, E.; Piccolo, D.; Postema, H.; Raffone, G.; Ropelewski, L.; Rodrigues, A. Malta; Saviano, G.; Sharma, A.; Smilkjovic, N.; Staib, M. J.; Teng, H.; Tupputi, S. A.; Turini, N.; Tytgat, M.; Verhagen, Erik; Villa, M.; Zaganidis, N.; Zientek, M.

doi:10.1016/j.nima.2012.10.058

Cited by 35 publications

(23 citation statements)

References 8 publications

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“…Detectors based on the Gas Electron Multiplier (GEM) [1] are widely used in particle physics experiments that require high position resolution over large areas in high-rate environments (e.g. COMPASS [2,3], LHCb [4], TOTEM [5,6], JLab Hall A [7] as well as ALICE [8,9] and CMS [10,11] after their upgrades). The GEM consists of a 50 µm thick polyimide foil which is coated on both sides with 5 µm thick copper layers.…”

Section: Introductionmentioning

confidence: 99%

Measurements of the Charging-Up Effect in Gas Electron Multipliers

Hauer,

Flöthner,

Schaab

et al. 2019

Preprint

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Gas Electron Multipliers (GEM) are widely used as amplification stage in gaseous detectors exposed to high rates, e.g. in the Time Projection Chamber of the ALICE (A Large Ion Collider Experiment) experiment after its upgrade. The GEM consists of a polyimide foil which is coated by two thin copper layers. GEM foils are known to collect charges on the polyimide part in its holes during the amplification process. This is accompanied by a change of the effective gain. The effect is commonly known as the "charge-up effect". This work presents two different methods to investigate the charge-up effect. Both methods were conducted with a single GEM as amplification stage. The first one is based on a current measurement while the second one relies on the analysis of 55 Fe spectra over time. Both methods combined give a quantitative result of the time constant on which the charge-up effect occurs. It can be shown that the characteristic time constant is of the order of 5 × 10 5 electrons/hole if the GEM voltage is set to 400 V. With the first method, two measurements at a GEM voltage of 350 V were conducted as well. Here, the time constant is approximately a factor ten higher.

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Section: Introductionmentioning

confidence: 99%

Measurements of the Charging-Up Effect in Gas Electron Multipliers

Hauer,

Flöthner,

Schaab

et al. 2019

Preprint

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“…In particular, a GEM chamber requires some time-consuming assembly steps such as the stretching and the gluing of the GEM foils [19], [20], [21]. For this detector one of the co-authors of this paper has recently proposed a solution based on the so called NS2 assembly approach [22]: an evolution of the stretching technique introduced for the GEM chambers of the LHCb experiment [14]. Similar considerations can be also done for Micromegas, where the metallic mesh, defining the detector amplification region, requires a precise stretching.…”

Section: Introductionmentioning

confidence: 99%

The micro-Resistive WELL detector: a compact spark-protected single amplification-stage MPGD

Bencivenni¹,

Oliveira²,

Morello³

et al. 2015

J. Inst.

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In this work we present a novel idea for a compact spark-protected single amplification stage Micro-Pattern Gas Detector (MPGD). The detector amplification stage, realized with a structure very similar to a GEM foil, is embedded through a resistive layer in the readout board. A cathode electrode, defining the gas conversion/drift gap, completes the detector mechanics. The new structure, that we call Resistive-WELL (R-WELL), has some characteristics in common with previous MPGDs, such as C.A.T. and WELL, developed more than ten years ago. The prototype object of the present study has been realized in the 2009 by TE-MPE-EM Workshop at CERN. The new architecture is a very compact MPGD, robust against discharges and exhibiting a large gain (∼6×10 3 ), simple to construct and easy for engineering and then suitable for large area tracking devices as well as huge calorimetric apparata.

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“…GEM foils are mechanically stretched and the chamber is constructed without the use of any glue. The technique was initially tested on small 30 × 30 cm 2 prototypes [11] and later used to construct actual GE1/1 chambers [12,13]. Since no glue is needed during the assembly this technique reduces the chamber assembly time from several days to a few hours only, and also allows for a chamber to be reopened in case of problems.…”

Section: Assembly Techniquementioning

confidence: 99%

Layout and assembly technique of the GEM chambers for the upgrade of the CMS first muon endcap station

Abbaneo

Abbas

Abbrescia

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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Triple-GEM detector technology was recently selected by CMS for a part of the upgrade of its forward muon detector system as GEM detectors provide a stable operation in the high radiation environment expected during the future High-Luminosity phase of the Large Hadron Collider (HL-LHC). In a first step, GEM chambers (detectors) will be installed in the innermost muon endcap station in the pseudo-rapidity region, mainly to control level-1 muon trigger rates after the second LHC Long Shutdown. These new chambers will add redundancy to the muon system in the-region where the background rates are high, and the bending of the muon trajectories due to the CMS magnetic field is small. A novel construction technique for such chambers has been developed in such a way where foils are mounted onto a single stack and then uniformly stretched mechanically, avoiding the use of spacers and glue inside the active gas volume. We describe the layout, the stretching mechanism and the overall assembly technique of such GEM chambers.

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GEM based detector for future upgrade of the CMS forward muon system

Cited by 35 publications

References 8 publications

Measurements of the Charging-Up Effect in Gas Electron Multipliers

Measurements of the Charging-Up Effect in Gas Electron Multipliers

The micro-Resistive WELL detector: a compact spark-protected single amplification-stage MPGD

Layout and assembly technique of the GEM chambers for the upgrade of the CMS first muon endcap station

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