CMS endcap RPC gas gap production for upgrade

Park, S K; Choi, S.; Hong, B.; Jeng, Y. G.; Kang, Min Ho; Lee, K S; Sim, K. S.; Colaleo, A.; Pugliese, G.; Loddo, F.; Calabria, C.; Maggi, M.; Verwillingen, P.; Berzano, U.; Carrillo, Camilo; Aleksandrov, A.; Genchev, V.; Iaydjiev, P.; Rodozov, M.; Shopova, M.; Sultanov, G.

doi:10.1088/1748-0221/7/11/p11013

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…Figure 6.12 (right) illustrates the concept of the RPC. Figure 6.12: Comparison of different muon detector technologies employed at CMS [68,86]. DT is shown on the upper left, RPC on the upper right, and CSC on the lower center.…”

Section: Muon Systemmentioning

confidence: 99%

Search for dark matter decaying to two displaced muons produced in proton-proton collisions at 13 TeV with the CMS detector, and for dark photons produced in electron-positron fixed-target collisions at 500 MeV with the PADME detector

Frankenthal

2020

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Two novel searches for dark matter using particle accelerators are presented. The first is a search for inelastically-coupled dark matter with the CMS detector at CERN, relying on 137 inverse femtobarns of proton-proton collision data collected at 13 TeV center-ofmass energy between 2016 and 2018. The search strategy exploits the striking signature expected of inelastic dark matter: a pair of displaced, soft, and narrow muons collimated with missing transverse momentum and recoiled off an initial-state radiation jet. This is the first search for inelastic dark matter at a hadron collider. The second experiment is PADME, a small-scale detector to search for dark photons located in Frascati, Italy. PADME seeks to detect the production of dark photons in positron-electron collisions with a stationary diamond target and a 500 MeV positron beam. The missing-mass technique employed in the experiment relies on constraining all four-momenta in the system except for the dark photon and looking for a bump in the resulting invariant mass distribution corresponding to the dark photon's mass. The projected sensitivity for both experiments is compared in the context of highlighting the need for a comprehensive experimental search program for dark matter. Both analyses expect first public results by the end of 2020.

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Section: Muon Systemmentioning

confidence: 99%

Search for dark matter decaying to two displaced muons produced in proton-proton collisions at 13 TeV with the CMS detector, and for dark photons produced in electron-positron fixed-target collisions at 500 MeV with the PADME detector

Frankenthal

2020

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“…The HPL panels (≈3500 m 2 ) were produced, cut and validated in Italy and shipped to Korea to be assembled to form RPC gaps. The Korean gap manufacturing site [4] is performing several quality control measurements, called Quality Control 1 (QC1), on the HPL panels to ensure the correct resistivity, thickness and roughness and on RPC gaps to monitor the detector performance.…”

Section: Chamber Design Production and Quality Controlsmentioning

confidence: 99%

Resistive plate chambers for 2013-2014 muon upgrade in CMS at LHC

Colafranceschi¹,

Chudasama²,

Pant³

et al. 2014

J. Inst.

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During 2013 and 2014 (Long Shutdown LS1) the CMS experiment is upgrading the forward region installing a fourth layer of RPC detectors in order to complete and improve the muon system performances in the view of the foreseen high luminosity run of LHC. The new two endcap disks consists of 144 double-gap RPC chambers assembled at three different production sites: CERN, Ghent (Belgium) and BARC (India). The chamber components as well as the final detectors are subjected to full series of tests established in parallel at all the production sites.All assembly and test operations have been engineered in order to standardize and improve detector production. In this work the complete chamber construction, quality control procedures and preliminary results will be detailed.

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“…As illustrated in figure 1, the current CMS RPC system covering a pseudorapidity range of |η| < 1.6 comprises six trigger stations in the barrel and four trigger stations in the endcap sections of the CMS detector [6,7]. The fourth RPC trigger station in the endcap section (the zone in the upper-right solid line of figure 1) has been recently installed to reinforce the muon-trigger efficiency of the CMS for the LHC runs, starting in 2015 [8,9]. The current CMS endcap RPCs comprise 2-mm-thick double-gap chambers, each covering an azimuthal (φ) angular range of 10 • .…”

Section: Introductionmentioning

confidence: 99%

Radiation tests of real-sized prototype RPCs for the Phase-2 Upgrade of the CMS Muon System

et al. 2016

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We report on a systematic study of double-gap and four-gap phenolic resistive plate chambers (RPCs) for the Phase-2 upgrade of the CMS muon system at high η. 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 with cosmic rays and with 100-GeV muons provided by the SPS H4 beam line at CERN. To examine the rate capability of the prototype RPCs both at Korea University and at the CERN GIF++ facility, the chambers were irradiated with 137 Cs sources providing maximum gamma rates of about 1.5 kHz cm -2 . In contrast to the case of the four-gap RPCs, we found the relatively high threshold on the produced detector charge 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 runs of the Large Hadron Collider (LHC).-1 - Contents

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CMS endcap RPC gas gap production for upgrade

Cited by 4 publications

References 2 publications

Search for dark matter decaying to two displaced muons produced in proton-proton collisions at 13 TeV with the CMS detector, and for dark photons produced in electron-positron fixed-target collisions at 500 MeV with the PADME detector

Search for dark matter decaying to two displaced muons produced in proton-proton collisions at 13 TeV with the CMS detector, and for dark photons produced in electron-positron fixed-target collisions at 500 MeV with the PADME detector

Resistive plate chambers for 2013-2014 muon upgrade in CMS at LHC

Radiation tests of real-sized prototype RPCs for the Phase-2 Upgrade of the CMS Muon System

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