CERN Accelerating science

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1.
Measurement of the background in the CMS muon detector in ${p}{p}$-collisions at $\sqrt{s} = 13$ $\,\text {Te}\hspace{-.08em}\text {V}$ / CMS Muon Collaboration
The CMS detector, including its muon system, has been operating at the CERN LHC in increasingly challenging conditions for about 15 years. The muon detector was designed to provide excellent triggering and track reconstruction for muons produced in proton–proton collisons at an instantaneous luminosity ($\mathcal {L}$) of $1 \times 10^{34}$ cm$^{-2}$s$^{-1}$. [...]
2024 - 43 p. - Published in : Eur. Phys. J. C 84 (2024) 955 Fulltext: PDF;
2.
Impact of magnetic field on the stability of the CMS GE1/1 GEM detector operation / Abbas, M (KIT, Karlsruhe) ; Abbott, S (UC, Davis) ; Abbrescia, M (Bari U. ; INFN, Bari) ; Abdalla, H (Alexandria U. ; American U., Cairo) ; Abdelalim, A (Alexandria U. ; Zewail City Sci. Technol., Giza) ; AbuZeid, S (Ain Shams U., Cairo ; INFN, Pavia) ; Aebi, D (Texas A-M) ; Agapitos, A (Peking U.) ; Ahmad, A (NCP, Islamabad) ; Ahmed, A (Delhi Tech. U.) et al.
The Gas Electron Multiplier (GEM) detectors of the GE1/1 station of the CMS experiment have been operated in the CMS magnetic field for the first time on the 7$^{th}$ of October 2021. During the magnetic field ramps, several discharge phenomena were observed, leading to instability in the GEM High Voltage (HV) power system. [...]
2023 - 24 p. - Published in : JINST 18 (2023) P11029 Fulltext: PDF;
3.
Production and validation of industrially produced large-sized GEM foils for the Phase-2 upgrade of the CMS muon spectrometer / Abbas, Syed Mohsin (IPM, Tehran) ; Abbrescia, Marcello (INFN, Bari ; Bari U.) ; Abdalla, Hassan Fathy (Cairo, Acad. Sci. Res. Tech.) ; Abdelalim, Ahmed Ali (Cairo, Acad. Sci. Res. Tech.) ; Abuzeid Hassan, Shimaa Abdelwahed (INFN, Pavia) ; Aebi, Devin Michael (Texas A-M) ; Agapitos, Antonis (Peking U.) ; Ahmad, Ashfaq (Quaid-i-Azam U.) ; Ahmed, Asar (Delhi U.) ; Ahmed, Waqar (Quaid-i-Azam U.) et al.
The upgrade of the CMS detector for the high luminosity LHC (HL-LHC) will include gas electron multiplier (GEM) detectors in the end-cap muon spectrometer. Due to the limited supply of large area GEM detectors, the Korean CMS (KCMS) collaboration had formed a consortium with Mecaro Co., Ltd. to serve as a supplier of GEM foils with area of approximately 0.6 m$^{2}$. The consortium has developed a double-mask etching technique for production of these large-sized GEM foils. This article describes the production, quality control, and quality assessment (QA/QC) procedures and the mass production status for the GEM foils. [...]
CMS-NOTE-2023-006; CERN-CMS-NOTE-2023-006.- Geneva : CERN, 2023 - 18 p. Fulltext: PDF;
4.
Quality Control of Mass-Produced GEM Detectors for the CMS GE1/1 Muon Upgrade / Abbas, Syed Mohsin (IPM, Tehran) ; Abbrescia, Marcello (INFN, Bari ; Bari U.) ; Abdalla, Hassan Fathy (Cairo, Acad. Sci. Res. Tech.) ; Abdelalim, Ahmed Ali (Cairo, Acad. Sci. Res. Tech.) ; Abuzeid Hassan, Shimaa Abdelwahed (INFN, Pavia) ; Agapitos, Antonis (Peking U.) ; Ahmad, Ashfaq (Quaid-i-Azam U.) ; Ahmed, Asar (Delhi U.) ; Ahmed, Waqar (Quaid-i-Azam U.) ; Aimè, Chiara (INFN, Pavia ; Pavia U.) et al.
The series of upgrades to the Large Hadron Collider, culminating in the High Luminosity Large Hadron Collider, will enable a significant expansion of the physics program of the CMS experiment. However, the accelerator upgrades will also make the experimental conditions more challenging, with implications for detector operations, triggering, and data analysis. [...]
CMS-NOTE-2022-004; CERN-CMS-NOTE-2022-004.- Geneva : CERN, 2022 - 47 p. Fulltext: PDF;
5.
Benchmarking LHC background particle simulation with the CMS triple-GEM detector / CMS Collaboration
An estimate of environmental background hit rate on triple-GEM chambers is performed using Monte Carlo (MC) simulation and compared to data taken by test chambers installed in the CMS experiment (GE1/1) during Run-2 at the Large Hadron Collider (LHC). The hit rate is measured using data collected with proton-proton collisions at 13 TeV and a luminosity of 1.5$\times10^{34}$ cm$^{-2}$ s$^{-1}$. [...]
arXiv:2107.03621.- 2021-12-16 - 19 p. - Published in : JINST 16 (2021) P12026 Fulltext: 2107.03621 - PDF; document - PDF;
6.
Two years’ test of a temperature sensing system based on fibre Bragg grating technology for the CMS GE1/1 detectors / CMS Muon Group Collaboration
A temperature monitoring system based on fibre Bragg grating (FBG) fibre optic sensors has been developed for the gas electron multiplier (GEM) chambers of the Compact Muon Solenoid (CMS) detector. The monitoring system was tested in prototype chambers undergoing a general test of the various technological solutions adopted for their construction. [...]
2020 - 8 p. - Published in : J. Phys.: Conf. Ser. 1561 (2020) 012006 Fulltext: PDF;
In : Detection Systems and Techniques in Nuclear and Particle Physics, Messina, Italy, 11 - 13 Sep 2019, pp.012006
7.
Interstrip Capacitances of the Readout Board used in Large Triple-GEM Detectors for the CMS Muon Upgrade / CMS Muon Group Collaboration
We present analytical calculations, Finite Element Analysis modeling, and physical measurements of the interstrip capacitances for different potential strip geometries and dimensions of the readout boards for the GE2/1 triple-Gas Electron Multiplier detector in the CMS muon system upgrade. The main goal of the study is to find configurations that minimize the interstrip capacitances and consequently maximize the signal-to-noise ratio for the detector. [...]
arXiv:2009.09505.- 2020-12-14 - 21 p. - Published in : JINST 15 (2020) P12019 Fulltext: PDF; Fulltext from publisher: PDF;
8.
Performance of prototype GE1 ∕ 1 chambers for the CMS muon spectrometer upgrade / CMS Muon Collaboration
The high-luminosity phase of the Large Hadron Collider (HL-LHC) will result in ten times higher particle background than measured during the first phase of LHC operation. In order to fully exploit the highly-demanding operating conditions during HL-LHC, the Compact Muon Solenoid (CMS) Collaboration will use Gas Electron Multiplier (GEM) detector technology. [...]
arXiv:1903.02186.- 2020-08-21 - 23 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 972 (2020) 164104 Fulltext: PDF;
9.
Operational Experience With the GEM Detector Assembly Lines for the CMS Forward Muon Upgrade / Abbaneo, D (CERN) ; Abbrescia, M (Bari Polytechnic ; INFN, Bari) ; Ahmad, A (NCP, Islamabad) ; Ahmed, W (NCP, Islamabad) ; Ali, C (Texas A-M) ; Altieri, P R (Bari Polytechnic ; INFN, Bari) ; Amr, M (Cairo, Acad. Sci. Res. Tech.) ; Asghar, I (NCP, Islamabad) ; Aspell, P (CERN) ; Assran, Y (Cairo, Acad. Sci. Res. Tech.) et al.
The CMS Collaboration has been developing large-area triple-gas electron multiplier (GEM) detectors to be installed in the muon Endcap regions of the CMS experiment in 2019 to maintain forward muon trigger and tracking performance at the High-Luminosity upgrade of the Large Hadron Collider (LHC); 10 preproduction detectors were built at CERN to commission the first assembly line and the quality controls (QCs). These were installed in the CMS detector in early 2017 and participated in the 2017 LHC run. [...]
2018 - 9 p. - Published in : IEEE Trans. Nucl. Sci. 65 (2018) 2808-2816
10.
Layout and Assembly Technique of the GEM Chambers for the Upgrade of the CMS First Muon Endcap Station / CMS Muon Collaboration
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 $1.6<\left|\eta\right|<2.2$ pseudo-rapidity region, mainly to control level-1 muon trigger rates after the second LHC Long Shutdown. [...]
arXiv:1812.00411.- 2018-11-28 - 9 p. - Published in : Nucl. Instrum. Meth. A 918 (2019) 67-75 Fulltext: PDF; Fulltext from Publisher: PDF;

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