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CMS Notes

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2015-08-12
16:55
The CMS/TOTEM nominal FLUKA Model; version 1.0.0.0 / 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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2015-08-12
16:55
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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2015-06-23
11:22
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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2015-06-19
14:26
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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2015-02-09
17:07
"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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2014-09-08
14:05
Experimental study of the plastic scintillator damage caused by radiation on IREN at JINR. / Afanasiev, Sergey (Dubna, JINR) ; Borzakov, S.B ; Egorov, V.A ; Golutvin, Igor (Dubna, JINR) ; Igamkulov, Z.A ; Malakhov, Alexander (Dubna, JINR) ; Moisenz, Petr (Dubna, JINR) ; Pyataev, V.G ; Sedyshev, P.V ; Shvetsov, V.N et al.
This paper describes the studies of four types of plastic scintillators SCSN-81, UPS-923A (made by KIPT, Kharkov), BC-408, LHE (made by JINR, Dubna) performed by the CMS JINR group on Intense Resonance Neutron source (IREN) - the JINR neutron source facility. These studies were performed to measure a light yield from samples of different shapes before and after irradiation. [...]
CMS-NOTE-2014-003; CERN-CMS-NOTE-2014-003.- Geneva : CERN, 2014 - 17 p. Fulltext: PDF;

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2014-03-21
11:58
Measuring of induced radioactivity of the HE megatile on IREN at JINR. / Afanasiev, Sergey (Dubna, JINR) ; de Barbaro, Pawel Jan (Rochester U.) ; Borzakov, S.B ; Golutvin, Igor (Dubna, JINR) ; Igamkulov, Z.A ; Malakhov, Alexander (Dubna, JINR) ; Moisenz, Petr (Dubna, JINR) ; Pogodaev, G.N ; Pyataev, V.G ; Sedyshev, P.V et al.
Results of measurement of the induced radioactivity caused by neutrons for a segment of a multi sectional scintillation detector (megatile) are presented. Two endcap sampling calorimeters (HE) are parts of the hadron calorimeter (HCAL) of experimental setup CMS. [...]
CMS-NOTE-2014-002; CERN-CMS-NOTE-2014-002.- Geneva : CERN, 2014 - 13 p. Fulltext: PDF;

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2014-02-20
16:34
HE upgrade beyond phase 1. Finger scintillator option. / Afanasiev, Sergey (Dubna, JINR) ; de Barbaro, Pawel Jan (Rochester U.) ; Boyarintsev, A.Yu ; Emeliantchik, Igor (Minsk, High Energy Phys. Ctr.) ; Golutvin, Igor (Dubna, JINR) ; Grinyov, B.V ; Ershov, Yuri (Dubna, JINR) ; Levchuk, Leonid (Kharkov, KIPT) ; Litomin, Aliaksandr (Minsk, High Energy Phys. Ctr.) ; Malakhov, Alexander (Dubna, JINR) et al.
CMS hadron calorimeters (HB, HE, HO) have been in operation for several years and contributed substantially to the success of the CMS Physics Program. The endcap calorimeter HE suffered more radiation damage than anticipated causing rapid degradation of scintillator segments (tiles) which have a higher radiation flux from secondary particles than HB and HO. [...]
CMS-NOTE-2014-001; CERN-CMS-NOTE-2014-001.- Geneva : CERN, 2014 - 16 p. Fulltext: PDF;

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2013-10-07
11:06
Expected pileup values at the HL-LHC /ATLAS and CMS Collaborations
In this brief note the expected mean number of interactions and the length of the luminous region for the HL-LHC is discussed for an instantaneous luminosity of $5 \times 10^{34} /{\rm cm}^2/{\rm s}$. Its dependence on various parameters is discussed and an uncertainty is estimated. [...]
CMS-NOTE-2013-003; CERN-CMS-NOTE-2013-003.- Geneva : CERN, 2013 - 7 p. Fulltext: PDF;

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2013-07-30
10:46
Projected Performance of an Upgraded CMS Detector at the LHC and HL-LHC: Contribution to the Snowmass Process
The physics reach of the CMS detector achievable with 300(0) inverse femtobarns of proton-proton collisions recorded at sqrt(s)=14 TeV is presented. [...]
CMS-NOTE-2013-002 ; arXiv:1307.7135 ; CERN-CMS-NOTE-2013-002.
- 2013. - 48 p.
Full text - Preprint

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