CERN Accelerating science

CERN Document Server 7 záznamov nájdených  Hľadanie trvalo 0.66 sekúnd. 
1.
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;
2.
ALICE upgrades during the LHC Long Shutdown 2 / ALICE Collaboration
A Large Ion Collider Experiment (ALICE) has been conceived and constructed as a heavy-ion experiment at the LHC. During LHC Runs 1 and 2, it has produced a wide range of physics results using all collision systems available at the LHC. [...]
arXiv:2302.01238; CERN-EP-2023-009.- Geneva : CERN, 2024-05-23 - 159 p. - Published in : JINST 19 (2024) P05062 Draft (restricted): PDF; Fulltext: 2302.01238 - PDF; document - PDF;
In : The Large Hadron Collider and The Experiments for Run 3
3.
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;
4.
Studies of RPC detector operation with eco-friendly gas mixtures under irradiation at the CERN Gamma Irradiation Facility / Rigoletti, Gianluca (Lyon U.) ; Aielli, Giulio (Rome U., Tor Vergata) ; Alberghi, Gian Luigi (INFN, Bologna) ; Benussi, Luigi (Frascati) ; Bianchi, Antonio (INFN, Turin ; Turin U.) ; Bianco, Stefano (Frascati) ; Stante, Luigi Di (Rome U., Tor Vergata) ; Boscherini, Davide (INFN, Bologna) ; Bruni, Alessia (INFN, Bologna) ; Camarri, Paolo (Rome U.) et al.
Resistive Plate Chamber (RPC) detectors are widely used at the CERN LHC experiments as muon trigger thanks to their excellent time resolution. They are operated with a Freon-based gas mixture containing $C_2 H_2 F_4$ and $SF_6$, both greenhouse gases (GHG) with a very high global warming potential (GWP).The search of new environmentally friendly gas mixtures is necessary to reduce GHG emissions and costs as well as to optimize RPC performance.Several recently available gases with low GWP have been identified as possible replacements for $C_2 H_2 F_4$ and $SF_6$.In particular, eco-friendly gas mixtures based on the HFO-1234ze have been investigated on 1.4 and 2 mm single-gap and double-gap RPCs.The RPC detectors have been tested at the CERN Gamma Irradiation Facility (GIF++), which provides a high energy muon beam combined with an intense gamma source allowing to simulate the background expected at HL-LHC.The performance of RPCs were studied at different gamma rates with the new environmentally friendly gases by measuring ohmic and physics currents, fluorine radicals and HF production, rate capability and induced charge.Preliminary results on the long-term effects on the performance of the detectors are presented in this study..
SISSA, 2020 - 7 p. - Published in : PoS EPS-HEP2019 (2020) 164 Fulltext: PDF;
In : European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019, pp.164
5.
Performance of the CMS muon detector and muon reconstruction with proton-proton collisions at $\sqrt{s}=$ 13 TeV / CMS Collaboration
The CMS muon detector system, muon reconstruction software, and high-level trigger underwent significant changes in 2013-2014 in preparation for running at higher LHC collision energy and instantaneous luminosity. The performance of the modified system is studied using proton-proton collision data at center-of-mass energy $\sqrt{s}=$ 13 TeV, collected at the LHC in 2015 and 2016. [...]
arXiv:1804.04528; CMS-MUO-16-001; CERN-EP-2018-058; CMS-MUO-16-001-003.- Geneva : CERN, 2018-06-19 - 53 p. - Published in : JINST 13 (2018) P06015 Fulltext: 1804.04528 - PDF; openaccess_Sirunyan_2018_J._Inst._13_P06015 - PDF; Fulltext from Publisher: PDF; External links: Additional information for the analysis; CMS AuthorList
6.
Preliminary results of Resistive Plate Chambers operated with eco-friendly gas mixtures for application in the CMS experiment / CMS Collaboration
The operations of Resistive Plate Chambers in LHC experiments require F-based gases for optimal performance. Recent regulations demand the use of environmentally unfriendly F-based gases to be limited or banned. [...]
CMS-CR-2016-074.- Geneva : CERN, 2016 - 9 p. Fulltext: PDF;
In : 13th Workshop on Resistive Plate Chambers and Related Detectors, Ghent, Belgium, 22 - 26 Feb 2016
7.
CHEMICAL ANALYSES OF MATERIALS USED IN THE CMS RPC MUON DETECTOR / Bianco, Stefano (FRASCATI) ; Colafranceschi, Stefano (FRASCATI) ; Colonna, Danilo (FRASCATI) ; Felli, Ferdinando (FRASCATI) ; Greci, T ; Paolozzi, Antonio (FRASCATI) ; Passamonti, Luciano (FRASCATI) ; Pierluigi, Daniele (FRASCATI) ; Pucci, Cristiano (FRASCATI) ; Russo, Alessandro (FRASCATI) et al.
Results are reported on a study of materials used in the CERN Closed Loop recirculation gas system presently under test with the RPC muon detectors in the CMS experiment at the LHC. Studies include a sampling campaign in a low-radiation environment (cosmic rays at the CERN ISR test site). [...]
CMS-NOTE-2010-006.- Geneva : CERN, 2009 - 23 p. Fulltext: PDF;

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