CERN Accelerating science

CMS Notes

Selection of the silicon sensor thickness for the Phase-2 upgrade of the CMS Outer Tracker / The Tracker Group of the CMS Collaboration /CMS Collaboration
During the operation of the CMS experiment at the High-Luminosity LHC the silicon sensors of the Phase-2 Outer Tracker will be exposed to radiation levels that could potentially deteriorate their performance. Previous studies had determined that planar float zone silicon with n-doped strips on a p-doped substrate was preferred over p-doped strips on an n-doped substrate. [...]
CMS-NOTE-2021-008; CERN-CMS-NOTE-2021-008.- Geneva : CERN, 2020 - 43 p. Fulltext: PDF;

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Performance of prototype GE1$\slash$1 chambers for the CMS muon spectrometer upgrade / The CMS Muon Group
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. [...]
CMS-NOTE-2020-001; CERN-CMS-NOTE-2020-001.- Geneva : CERN, 2019 - 19 p. Fulltext: PDF;

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FLUKA Run 2 simulation benchmarking with beam loss monitors in the CMS forward region / Kicsiny, Peter (CERN)
The FLUKA simulation framework is a general purpose Monte Carlo software for nuclear physics applications. It is commonly used by the CMS collaboration to make estimates on radiation levels in the underground cavern and at specific detector locations. [...]
CMS-NOTE-2021-007; CERN-CMS-NOTE-2021-007.- Geneva : CERN, 2021 - 19 p. Fulltext: PDF;

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Position resolution with 25 $\mu$m pitch pixel sensors before and after irradiation / Ebrahimi, Aliakbar (PSI, Villigen) ; Feindt, Finn (Hamburg U.) ; Garutti, Erika (Hamburg U.) ; Gunnellini, Paolo (Hamburg U.) ; Hinzmann, Andreas Dominik (Hamburg U.) ; Niemeyer, Caroline (Hamburg U.) ; Pitzl, Daniel (DESY) ; Schwandt, Joern (Hamburg U.) ; Steinbrueck, Georg (Hamburg U.) ; Zoi, Irene (Hamburg U.)
Pixelated silicon detectors are state-of-the-art technology to achieve precise tracking and vertexing at collider experiments, designed to accurately measure the hit position of incoming particles in high rate and radiation environments. The detector requirements become extremely demanding for operation at the High-Luminosity LHC, where up to 200 interactions will overlap in the same bunch crossing on top of the process of interest. [...]
CMS-NOTE-2021-006; CERN-CMS-NOTE-2021-006.- Geneva : CERN, 2021 - 18 p. Fulltext: PDF;

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Towards Common $t\bar{t}$ Monte-Carlo Settings for ATLAS and CMS / The ATLAS ; CMS Collaborations /ATLAS and CMS Collaborations
Both ATLAS and CMS use POWHEG+PYTHIA8 Monte-Carlo simulations to model the $t\bar{t}$ process. A commonly agreed upon set of POWHEG and PYTHIA8 parameters is presented and compared to the nominal ATLAS and CMS settings. [...]
CMS-NOTE-2021-005; CERN-CMS-NOTE-2021-005.- Geneva : CERN, 2021 - 19 p. Fulltext: PDF;

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Comparative evaluation of analogue front-end designs for the CMS Inner Tracker at the High Luminosity LHC / Emriskova, Natalia (CERN)
The CMS Inner Tracker, made of silicon pixel modules, will be entirely replaced for the operation at the High Luminosity LHC. One of the crucial components of the new Inner Tracker system is the readout chip, being developed by the RD53 Collaboration, and in particular its analogue front-end that receives the signal from the sensor and digitizes it. [...]
CMS-NOTE-2021-004; CERN-CMS-NOTE-2021-004.- Geneva : CERN, 2020 - 32 p. Fulltext: PDF;

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Test beam characterization of sensor prototypes for the CMS Barrel MIP Timing Detector / CMS MTD collaboration
The MIP Timing Detector will provide additional timing capabilities for detection of minimum ionizing particles (MIPs) at CMS during the High Luminosity LHC era, improving event reconstruction and pileup rejection. The central portion of the detector, the Barrel Timing Layer (BTL), will be instrumented with LYSO:Ce crystals and Silicon Photomultipliers (SiPMs) providing a time resolution of about 30~ps at the beginning of operation, and degrading to 50-60~ps at the end of the detector lifetime as a result of radiation damage. [...]
CMS-NOTE-2021-003; CERN-CMS-NOTE-2021-003.- Geneva : CERN, 2020 - 29 p. Fulltext: PDF;

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Evolution of the CMS Computing Model towards Phase-2 / CMS Offline Software ; Computing
The success of the physics program of the Compact Muon Solenoid (CMS) experiment critically depends on the availability of sufficient computing resources to store, process, and analyze data efficiently. The luminosity of HL-LHC and the upgraded detector promise scientific results of great impact [...]
CMS-NOTE-2021-001; CERN-CMS-NOTE-2021-001.- Geneva : CERN, 2021 - 20 p. Fulltext: PDF;

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The CMS Phase-1 Pixel Detector Upgrade / The Tracker Group of the CMS Collaboration /CMS Collaboration
The CMS detector at the CERN LHC features a silicon pixel detector as its innermost subdetector. The original CMS pixel detector has been replaced with an upgraded pixel system (CMS Phase-1 pixel detector) in the extended year-end technical stop of the LHC in 2016/2017. [...]
CMS-NOTE-2020-005; CERN-CMS-NOTE-2020-005.- Geneva : CERN, 2020 - 73 p. Fulltext: PDF;

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Test beam results of irradiated single-crystal CVD diamond detectors at DESY-II / Bossini, Edoardo (INFN, Pisa) ; Figueiredo, Diego Matos (Rio de Janeiro State U.) ; Forthomme, Laurent Marie C (Helsinki U.) ; Garcia Fuentes, Francisco Ignacio (Helsinki Inst. of Phys.)
Sensors based on scCVD diamonds have been operated in the Precision Proton Spectrometer (PPS) of the CMS experiment during the LHC Run 2. Such sensors were used for the timing system of PPS and were hosted in the Roman Pots (RPs), movable devices allowing to bring the detectors inside the LHC beam pipe, at few millimeters from the beams. [...]
CMS-NOTE-2020-007; CERN-CMS-NOTE-2020-007.- Geneva : CERN, 2020 - 27 p. Fulltext: PDF;

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