CERN Accelerating science

CMS Notes

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P-Type Silicon Strip Sensors for the Future CMS Tracker / The Tracker Group of the CMS Collaboration /CMS Collaboration
The upgrade to the High-Luminosity LHC (HL-LHC) is expected to increase the LHC design luminosity by an order of magnitude. This will require silicon tracking detectors with a significantly higher radiation hardness. [...]
CMS-NOTE-2017-003; CERN-CMS-NOTE-2017-003.- Geneva : CERN, 2016 - 18 p. Fulltext: PDF;

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Test Beam Performance Measurements for the Phase I Upgrade of the CMS Pixel Detector / Spannagel, Simon (DESY) ; Choudhury, Somnath (Bangalore, Indian Inst. Sci.) ; Contreras-Campana, Christian Javier (DESY) ; Dolinska, Ganna (DESY) ; Erdmann, Wolfram (PSI, Villigen) ; Garutti, Erika (Hamburg U.) ; Kastli, H.C ; Korol, Ievgen (DESY) ; Meier, Beat (PSI, Villigen) ; Perieanu, Adrian (Hamburg U.) et al.
A new pixel detector for the CMS experiment is being built, owing to the instantaneous luminosities anticipated for the Phase I Upgrade of the LHC. The new CMS pixel detector provides four-hit tracking while featuring a reduced material budget as well as new cooling and powering schemes. [...]
CMS-NOTE-2017-002; CERN-CMS-NOTE-2017-002.- Geneva : CERN, 2016 - 19 p. Fulltext: PDF;

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Simplified likelihood for the re-interpretation of public CMS results / The CMS Collaboration /CMS Collaboration
In this note, a procedure for the construction of simplified likelihoods for the re-interpretation of the results of CMS searches for new physics is presented. The procedure relies on the use of a reduced set of information on the background models used in these searches which can readily be provided by the CMS collaboration. [...]
CMS-NOTE-2017-001; CERN-CMS-NOTE-2017-001.- Geneva : CERN, 2017 - 26 p. Fulltext: PDF;

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Upgrades for the Precision Proton Spectrometer at the LHC: Fast Timing and Tracking Detectors / Gallinaro, Michele (LIP, Lisbon) /CMS and TOTEM Collaborations
The CMS-TOTEM Precision Proton Spectrometer (CT-PPS) is an approved project to add tracking and timing information at approximately $\pm$210~m from the interaction point around the CMS detector. It is designed to operate at high luminosity with up to 50 interactions per 25~ns bunch crossing to perform measurements of e.g. [...]
CMS-NOTE-2016-002; CERN-CMS-NOTE-2016-002.- Geneva : CERN, 2016 - 5 p. Fulltext: PDF;

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The pxarCore Library - Technical Documentation, Reference Manual, and Sample Applications / Spannagel, Simon (DESY) ; Meier, Beat (PSI, Villigen) ; Perrey, Hanno Christopher (DESY)
This document describes the pxarCore library as of version 2.7, a versatile cross-platform library to program and read out devices featuring PSI46-type readout chips (ROCs) via the PSI digital test beoard (DTB). The design principles and features are presented together with an overview over possible configurations and use cases. [...]
CMS-NOTE-2016-001; CERN-CMS-NOTE-2016-001.- Geneva : CERN, 2015 - 91 p. Fulltext: PDF;

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The CMS/TOTEM nominal FLUKA Model; version / Guthoff, Moritz (CERN) ; Kurochkin, Igor (Serpukhov, IHEP) ; Mallows, Sophie (Karlsruhe U., EKP) ; Ravotti, Federico (INFN, Turin) ; Urscheler, Christina (Zurich, ETH)
For a physics experiment such as CMS the understanding of the radiation environment is of great interest. It is necessary for the evaluation of the detector performance, effectiveness of shielding or to assess radiation damage. [...]
CMS-NOTE-2015-004; CERN-CMS-NOTE-2015-004.- Geneva : CERN, 2015 - 12 p. Fulltext: PDF;

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ATLAS+CMS Boosted topologies (Run1 results, Run2 potential) / Stupak, John (Purdue U., Calumet)
As no sign of beyond the Standard Model (BSM) physics has yet been observed at the LHC, experimental searches continue to probe ever higher mass scales. The decay of new, heavy resonances can produce highly Lorentz boosted particles, such as top quarks and Higgs or vector bosons. [...]
CMS-NOTE-2015-005; CERN-CMS-NOTE-2015-005.- Geneva : CERN, 2015 - 9 p. Fulltext: PDF;

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Trapping in irradiated p-on-n silicon sensors at fluences anticipated at the HL-LHC outer tracker / Pohlsen, Thomas (Hamburg U.) ; Eckhart Fretwurst ; Garutti, Erika (Hamburg U.) ; Junkes, Alexandra (Hamburg U.) ; Steinbrueck, Georg (Hamburg U.)
The degradation of signal in silicon sensors is studied under conditions expected at the CERN High-Luminosity LHC. 200~$\mu$m thick n-type silicon sensors are irradiated with protons of different energies to fluences of up to $3 \cdot 10^{15}$~neq/cm$^2$. Pulsed red laser light with a wavelength of 672~nm is used to generate electron-hole pairs in the sensors. [...]
CMS-NOTE-2015-002; CERN-CMS-NOTE-2015-002.- Geneva : CERN, 2014 - 13 p. Fulltext: PDF;

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Impact of low-dose electron irradiation on $n^+p$ silicon strip sensors / The CMS Tracker Collaboration
The response of $n^+p$ silicon strip sensors to electrons from a $^{90}$Sr source was measured using a multi-channel read-out system with 25\,ns sampling time. The measurements were performed over a period of several weeks, during which the operating conditions were varied. The sensors were fabricated by Hamamatsu Photonics\,K.\,K. [...]
CMS-NOTE-2015-003; CERN-CMS-NOTE-2015-003.- Geneva : CERN, 2014 - 15 p. Fulltext: PDF;

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"Finger" structure of tiles in CMS Endcap Hadron Calorimeters / Afanasiev, Sergey (Dubna, JINR) ; Boyarintsev, A.Yu ; Danilov, Mikhail (Moscow Phys. Eng. Inst.) ; Emeliantchik, Igor (Minsk, High Energy Phys. Ctr.) ; Ershov, Yuri (Dubna, JINR) ; Golutvin, Igor (Dubna, JINR) ; Grinyov, B.V ; Ibragimova, Elvira (Tashkent, IYF) ; Levchuk, Leonid (Kharkov, KIPT) ; Litomin, Aliaksandr (Minsk, High Energy Phys. Ctr.) et al.
Two CMS Endcap hadron calorimeters (HE) have been in operation for several years and contributed substantially to the success of the CMS Physics Program. The HE calorimeter suffered more from the radiation than it had been anticipated because of rapid degradation of scintillator segments (tiles) which have a high radiation flux of secondary particles. [...]
CMS-NOTE-2015-001; CERN-CMS-NOTE-2015-001.- Geneva : CERN, 2015 - 15 p. Fulltext: PDF;

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