Showing 1–9 of 9 results for author: Magnani, A

R&D towards the CMS RPC Phase-2 upgrade

Authors: A. Fagot, A. Cimmino, S. Crucy, M. Gul, A. A. O. Rios, M. Tytgat, N. Zaganidis, S. Aly, Y. Assran, A. Radi, A. Sayed, G. Singh, M. Abbrescia, G. Iaselli, M. Maggi, G. Pugliese, P. Verwilligen, W. Van Doninck, S. Colafranceschi, A. Sharma, L. Benussi, S. Bianco, D. Piccolo, F. Primavera, V. Bhatnagar , et al. (71 additional authors not shown)

Abstract: The high pseudo-rapidity region of the CMS muon system is covered by Cathode Strip Chambers (CSC) only and lacks redundant coverage despite the fact that it is a challenging region for muons in terms of backgrounds and momentum resolution. In order to maintain good efficiency for the muon trigger in this region additional RPCs are planned to be installed in the two outermost stations at low angle… ▽ More The high pseudo-rapidity region of the CMS muon system is covered by Cathode Strip Chambers (CSC) only and lacks redundant coverage despite the fact that it is a challenging region for muons in terms of backgrounds and momentum resolution. In order to maintain good efficiency for the muon trigger in this region additional RPCs are planned to be installed in the two outermost stations at low angle named RE3/1 and RE4/1. These stations will use RPCs with finer granularity and good timing resolution to mitigate background effects and to increase the redundancy of the system. △ Less

Submitted 14 June, 2016; originally announced June 2016.

Comments: 13th Workshop on Resistive Plate Chambers and related detectors, 22-26 February 2016, Ghent University, Belgium

High rate, fast timing Glass RPC for the high η CMS muon detectors

Authors: F. Lagarde, M. Gouzevitch, I. Laktineh, V. Buridon, X. Chen, C. Combaret, A. Eynard, L. Germani, G. Grenier, H. Mathez, L. Mirabito, A. Petrukhin, A. Steen, W. Tromeuraa, Y. Wang, A. Gongab, N. Moreau, C. de la Taille, F. Dulucqac, A. Cimmino, S. Crucy, A. Fagot, M. Gul, A. A. O. Rios, M. Tytgat , et al. (86 additional authors not shown)

Abstract: The HL-LHC phase is designed to increase by an order of magnitude the amount of data to be collected by the LHC experiments. To achieve this goal in a reasonable time scale the instantaneous luminosity would also increase by an order of magnitude up to $6.10^{34} cm^{-2} s^{-1}$ . The region of the forward muon spectrometer ($|η| > 1.6$) is not equipped with RPC stations. The increase of the expec… ▽ More The HL-LHC phase is designed to increase by an order of magnitude the amount of data to be collected by the LHC experiments. To achieve this goal in a reasonable time scale the instantaneous luminosity would also increase by an order of magnitude up to $6.10^{34} cm^{-2} s^{-1}$ . The region of the forward muon spectrometer ($|η| > 1.6$) is not equipped with RPC stations. The increase of the expected particles rate up to $2 kHz/cm^{2}$ (including a safety factor 3) motivates the installation of RPC chambers to guarantee redundancy with the CSC chambers already present. The actual RPC technology of CMS cannot sustain the expected background level. The new technology that will be chosen should have a high rate capability and provides a good spatial and timing resolution. A new generation of Glass-RPC (GRPC) using low-resistivity (LR) glass is proposed to equip at least the two most far away of the four high $η$ muon stations of CMS. First the design of small size prototypes and studies of their performance in high-rate particles flux is presented. Then the proposed designs for large size chambers and their fast-timing electronic readout are examined and preliminary results are provided. △ Less

Submitted 22 July, 2016; v1 submitted 4 June, 2016; originally announced June 2016.

Comments: 14 pages, 11 figures, Conference proceeding for the 2016 Resistive Plate Chambers and Related Detectors

Performance of Resistive Plate Chambers installed during the first long shutdown of the CMS experiment

Authors: M. Shopova, A. Aleksandrov, R. Hadjiiska, P. Iaydjiev, G. Sultanov, M. Rodozov, S. Stoykova, Y. Assran, A. Sayed, A. Radi, S. Aly, G. Singh, M. Abbrescia, G. Iaselli, M. Maggi, G. Pugliese, P. Verwilligen, W. Van Doninck, S. Colafranceschi, A. Sharma, L. Benussi, S. Bianco, D. Piccolo, F. Primavera, A. Cimmino , et al. (71 additional authors not shown)

Abstract: The CMS experiment, located at the CERN Large Hadron Collider, has a redundant muon system composed by three different detector technologies: Cathode Strip Chambers (in the forward regions), Drift Tubes (in the central region) and Resistive Plate Chambers (both its central and forward regions). All three are used for muon reconstruction and triggering. During the first long shutdown (LS1) of the L… ▽ More The CMS experiment, located at the CERN Large Hadron Collider, has a redundant muon system composed by three different detector technologies: Cathode Strip Chambers (in the forward regions), Drift Tubes (in the central region) and Resistive Plate Chambers (both its central and forward regions). All three are used for muon reconstruction and triggering. During the first long shutdown (LS1) of the LHC (2013-2014) the CMS muon system has been upgraded with 144 newly installed RPCs on the forth forward stations. The new chambers ensure and enhance the muon trigger efficiency in the high luminosity conditions of the LHC Run2. The chambers have been successfully installed and commissioned. The system has been run successfully and experimental data has been collected and analyzed. The performance results of the newly installed RPCs will be presented. △ Less

Submitted 22 May, 2016; originally announced May 2016.

Comments: 5 pages, 6 figures, proceeding to The XIII workshop on Resistive Plate Chambers and Related Detectors (RPC2016)

Report number: CMS CR-2016/090

Radiation Tests of Real-Sized Prototype RPCs for the Future CMS RPC Upscope

Authors: K. S. Lee, S. Choi, B. S. Hong, M. Jo, J. W. Kang, M. Kang, H. Kim, K. Lee, S. K. Parka, A. Cimmino, S. Crucy, A. Fagot, M. Gul, A. A. O. Rios, M. Tytgat, N. Zaganidis, S. Ali, Y. Assran, A. Radi, A. Sayed, G. Singh, M. Abbrescia, G. Iaselli, M. Maggi, G. Pugliese , et al. (71 additional authors not shown)

Abstract: We report on a systematic study of double-gap and four-gap phenolic resistive plate chambers (RPCs) for future high-η RPC triggers in the CMS. In the present study, we constructed real-sized double-gap and four-gap RPCs with gap thicknesses of 1.6 and 0.8 mm, respectively, with 2-mm-thick phenolic high-pressure-laminated (HPL) plates. We examined the prototype RPCs for cosmic rays and 100 GeV muon… ▽ More We report on a systematic study of double-gap and four-gap phenolic resistive plate chambers (RPCs) for future high-η RPC triggers in the CMS. In the present study, we constructed real-sized double-gap and four-gap RPCs with gap thicknesses of 1.6 and 0.8 mm, respectively, with 2-mm-thick phenolic high-pressure-laminated (HPL) plates. We examined the prototype RPCs for cosmic rays and 100 GeV muons provided by the SPS H4 beam line at CERN. We applied maximum gamma rates of 1.5 kHz cm-2 provided by 137Cs sources at Korea University and the GIF++ irradiation facility installed at the SPS H4 beam line to examine the rate capabilities of the prototype RPCs. In contrast to the case of the four-gap RPCs, we found the relatively high threshold was conducive to effectively suppressing the rapid increase of strip cluster sizes of muon hits with high voltage, especially when measuring the narrow-pitch strips. The gamma-induced currents drawn in the four-gap RPC were about one-fourth of those drawn in the double-gap RPC. The rate capabilities of both RPC types, proven through the present testing using gamma-ray sources, far exceeded the maximum rate expected in the new high-η endcap RPCs planned for future phase-II LHC runs. △ Less

Submitted 4 May, 2016; v1 submitted 2 May, 2016; originally announced May 2016.

Comments: Conference proceeding for the 2016 Resistive Plate Chambers and Related Detectors 8 pages, 9 figures

A novel application of Fiber Bragg Grating (FBG) sensors in MPGD

Authors: D. Abbaneo, M. Abbas, M. Abbrescia, A. A. Abdelalim, M. Abi Akl, O. Aboamer, D. Acosta, A. Ahmad, W. Ahmed, W. Ahmed, A. Aleksandrov, R. Aly, P. Altieri, C. Asawatangtrakuldee, P. Aspell, Y. Assran, I. Awan, S. Bally, Y. Ban, S. Banerjee, V. Barashko, P. Barria, G. Bencze, N. Beni, L. Benussi , et al. (133 additional authors not shown)

Abstract: We present a novel application of Fiber Bragg Grating (FBG) sensors in the construction and characterisation of Micro Pattern Gaseous Detector (MPGD), with particular attention to the realisation of the largest triple (Gas electron Multiplier) GEM chambers so far operated, the GE1/1 chambers of the CMS experiment at LHC. The GE1/1 CMS project consists of 144 GEM chambers of about 0.5 m2 active are… ▽ More We present a novel application of Fiber Bragg Grating (FBG) sensors in the construction and characterisation of Micro Pattern Gaseous Detector (MPGD), with particular attention to the realisation of the largest triple (Gas electron Multiplier) GEM chambers so far operated, the GE1/1 chambers of the CMS experiment at LHC. The GE1/1 CMS project consists of 144 GEM chambers of about 0.5 m2 active area each, employing three GEM foils per chamber, to be installed in the forward region of the CMS endcap during the long shutdown of LHC in 2108-2019. The large active area of each GE1/1 chamber consists of GEM foils that are mechanically stretched in order to secure their flatness and the consequent uniform performance of the GE1/1 chamber across its whole active surface. So far FBGs have been used in high energy physics mainly as high precision positioning and re-positioning sensors and as low cost, easy to mount, low space consuming temperature sensors. FBGs are also commonly used for very precise strain measurements in material studies. In this work we present a novel use of FBGs as flatness and mechanical tensioning sensors applied to the wide GEM foils of the GE1/1 chambers. A network of FBG sensors have been used to determine the optimal mechanical tension applied and to characterise the mechanical tension that should be applied to the foils. We discuss the results of the test done on a full-sized GE1/1 final prototype, the studies done to fully characterise the GEM material, how this information was used to define a standard assembly procedure and possible future developments. △ Less

Submitted 28 December, 2015; originally announced December 2015.

Comments: 4 pages, 4 figures, presented by Luigi Benussi at MPGD 2015 (Trieste, Italy). arXiv admin note: text overlap with arXiv:1512.08481

Report number: INFN-15-10/LNF

Fiber Bragg Grating (FBG) sensors as flatness and mechanical stretching sensors

Authors: D. Abbaneo, M. Abbas, M. Abbrescia, A. A. Abdelalim, M. Abi Akl, O. Aboamer, D. Acosta, A. Ahmad, W. Ahmed, W. Ahmed, A. Aleksandrov, R. Aly, P. Altieri, C. Asawatangtrakuldee, P. Aspell, Y. Assran, I. Awan, S. Bally, Y. Ban, S. Banerjee, V. Barashko, P. Barria, G. Bencze, N. Beni, L. Benussi , et al. (133 additional authors not shown)

Abstract: A novel approach which uses Fibre Bragg Grating (FBG) sensors has been utilised to assess and monitor the flatness of Gaseous Electron Multipliers (GEM) foils. The setup layout and preliminary results are presented. A novel approach which uses Fibre Bragg Grating (FBG) sensors has been utilised to assess and monitor the flatness of Gaseous Electron Multipliers (GEM) foils. The setup layout and preliminary results are presented. △ Less

Submitted 28 December, 2015; originally announced December 2015.

Comments: Two pages, one figure. Presented by Luigi Benussi (corresponding author) to Elba 2015 conference

Report number: Frascati Preprint INFN-15-09/LNF

Performance of a Large-Area GEM Detector Prototype for the Upgrade of the CMS Muon Endcap System

Authors: D. Abbaneo, M. Abbas, M. Abbrescia, A. A. Abdelalim, M. Abi Akl, W. Ahmed, W. Ahmed, P. Altieri, R. Aly, C. Asawatangtrakuldee, A. Ashfaq, P. Aspell, Y. Assran, I. Awan, S. Bally, Y. Ban, S. Banerjee, P. Barria, L. Benussi, V. Bhopatkar, S. Bianco, J. Bos, O. Bouhali, S. Braibant, S. Buontempo , et al. (113 additional authors not shown)

Abstract: Gas Electron Multiplier (GEM) technology is being considered for the forward muon upgrade of the CMS experiment in Phase 2 of the CERN LHC. Its first implementation is planned for the GE1/1 system in the $1.5 < \midη\mid < 2.2$ region of the muon endcap mainly to control muon level-1 trigger rates after the second long LHC shutdown. A GE1/1 triple-GEM detector is read out by 3,072 radial strips wi… ▽ More Gas Electron Multiplier (GEM) technology is being considered for the forward muon upgrade of the CMS experiment in Phase 2 of the CERN LHC. Its first implementation is planned for the GE1/1 system in the $1.5 < \midη\mid < 2.2$ region of the muon endcap mainly to control muon level-1 trigger rates after the second long LHC shutdown. A GE1/1 triple-GEM detector is read out by 3,072 radial strips with 455 $μ$rad pitch arranged in eight $η$-sectors. We assembled a full-size GE1/1 prototype of 1m length at Florida Tech and tested it in 20-120 GeV hadron beams at Fermilab using Ar/CO$_{2}$ 70:30 and the RD51 scalable readout system. Four small GEM detectors with 2-D readout and an average measured azimuthal resolution of 36 $μ$rad provided precise reference tracks. Construction of this largest GEM detector built to-date is described. Strip cluster parameters, detection efficiency, and spatial resolution are studied with position and high voltage scans. The plateau detection efficiency is [97.1 $\pm$ 0.2 (stat)]\%. The azimuthal resolution is found to be [123.5 $\pm$ 1.6 (stat)] $μ$rad when operating in the center of the efficiency plateau and using full pulse height information. The resolution can be slightly improved by $\sim$ 10 $μ$rad when correcting for the bias due to discrete readout strips. The CMS upgrade design calls for readout electronics with binary hit output. When strip clusters are formed correspondingly without charge-weighting and with fixed hit thresholds, a position resolution of [136.8 $\pm$ 2.5 stat] $μ$rad is measured, consistent with the expected resolution of strip-pitch/$\sqrt{12}$ = 131.3 $μ$rad. Other $η$-sectors of the detector show similar response and performance. △ Less

Submitted 8 December, 2014; v1 submitted 30 November, 2014; originally announced December 2014.

Comments: 8 pages, 32 figures, submitted to Proc. 2014 IEEE Nucl. Sci. Symposium, Seattle, WA, reference added

Annihilation of low energy antiprotons in silicon

Authors: S. Aghion, O. Ahlén, A. S. Belov, G. Bonomi, P. Bräunig, J. Bremer, R. S. Brusa, G. Burghart, L. Cabaret, M. Caccia, C. Canali, R. Caravita, F. Castelli, G. Cerchiari, S. Cialdi, D. Comparat, G. Consolati, J. H. Derking, S. Di Domizio, L. Di Noto, M. Doser, A. Dudarev, R. Ferragut, A. Fontana, P. Genova , et al. (34 additional authors not shown)

Abstract: The goal of the AE$\mathrm{\bar{g}}$IS experiment at the Antiproton Decelerator (AD) at CERN, is to measure directly the Earth's gravitational acceleration on antimatter. To achieve this goal, the AE$\mathrm{\bar{g}}$IS collaboration will produce a pulsed, cold (100 mK) antihydrogen beam with a velocity of a few 100 m/s and measure the magnitude of the vertical deflection of the beam from a straig… ▽ More The goal of the AE$\mathrm{\bar{g}}$IS experiment at the Antiproton Decelerator (AD) at CERN, is to measure directly the Earth's gravitational acceleration on antimatter. To achieve this goal, the AE$\mathrm{\bar{g}}$IS collaboration will produce a pulsed, cold (100 mK) antihydrogen beam with a velocity of a few 100 m/s and measure the magnitude of the vertical deflection of the beam from a straight path. The final position of the falling antihydrogen will be detected by a position sensitive detector. This detector will consist of an active silicon part, where the annihilations take place, followed by an emulsion part. Together, they allow to achieve 1$%$ precision on the measurement of $\bar{g}$ with about 600 reconstructed and time tagged annihilations. We present here, to the best of our knowledge, the first direct measurement of antiproton annihilation in a segmented silicon sensor, the first step towards designing a position sensitive silicon detector for the AE$\mathrm{\bar{g}}$IS experiment. We also present a first comparison with Monte Carlo simulations (GEANT4) for antiproton energies below 5 MeV △ Less

Submitted 11 March, 2014; v1 submitted 20 November, 2013; originally announced November 2013.

Comments: 21 pages in total, 29 figures, 3 tables

Prospects for measuring the gravitational free-fall of antihydrogen with emulsion detectors

Authors: AEgIS Collaboration, S. Aghion, O. Ahlén, C. Amsler, A. Ariga, T. Ariga, A. S. Belov, G. Bonomi, P. Bräunig, J. Bremer, R. S. Brusa, L. Cabaret, C. Canali, R. Caravita, F. Castelli, G. Cerchiari, S. Cialdi, D. Comparat, G. Consolati, J. H. Derking, S. Di Domizio, L. Di Noto, M. Doser, A. Dudarev, A. Ereditato , et al. (46 additional authors not shown)

Abstract: The main goal of the AEgIS experiment at CERN is to test the weak equivalence principle for antimatter. AEgIS will measure the free-fall of an antihydrogen beam traversing a moiré deflectometer. The goal is to determine the gravitational acceleration g for antihydrogen with an initial relative accuracy of 1% by using an emulsion detector combined with a silicon micro-strip detector to measure the… ▽ More The main goal of the AEgIS experiment at CERN is to test the weak equivalence principle for antimatter. AEgIS will measure the free-fall of an antihydrogen beam traversing a moiré deflectometer. The goal is to determine the gravitational acceleration g for antihydrogen with an initial relative accuracy of 1% by using an emulsion detector combined with a silicon micro-strip detector to measure the time of flight. Nuclear emulsions can measure the annihilation vertex of antihydrogen atoms with a precision of about 1 - 2 microns r.m.s. We present here results for emulsion detectors operated in vacuum using low energy antiprotons from the CERN antiproton decelerator. We compare with Monte Carlo simulations, and discuss the impact on the AEgIS project. △ Less

Submitted 24 June, 2013; originally announced June 2013.

Comments: 20 pages, 16 figures, 3 tables