The CMS experiment at the CERN LHC

TLDR: The Compact Muon Solenoid (CMS) detector at the Large Hadron Collider (LHC) at CERN as mentioned in this paper was designed to study proton-proton (and lead-lead) collisions at a centre-of-mass energy of 14 TeV (5.5 TeV nucleon-nucleon) and at luminosities up to 10(34)cm(-2)s(-1)

Abstract: The Compact Muon Solenoid (CMS) detector is described. The detector operates at the Large Hadron Collider (LHC) at CERN. It was conceived to study proton-proton (and lead-lead) collisions at a centre-of-mass energy of 14 TeV (5.5 TeV nucleon-nucleon) and at luminosities up to 10(34)cm(-2)s(-1) (10(27)cm(-2)s(-1)). At the core of the CMS detector sits a high-magnetic-field and large-bore superconducting solenoid surrounding an all-silicon pixel and strip tracker, a lead-tungstate scintillating-crystals electromagnetic calorimeter, and a brass-scintillator sampling hadron calorimeter. The iron yoke of the flux-return is instrumented with four stations of muon detectors covering most of the 4 pi solid angle. Forward sampling calorimeters extend the pseudo-rapidity coverage to high values (vertical bar eta vertical bar <= 5) assuring very good hermeticity. The overall dimensions of the CMS detector are a length of 21.6 m, a diameter of 14.6 m and a total weight of 12500 t.

Figures

Fig. 4. 8x8 FED Builder with a two-rail network.

Table 7.2: Basic construction parameters.

Figure 5.12: Partially assembled HE-minus absorber in the CMS surface hall (SX5). Scintillator trays can be seen to be inserted in some of the outer sectors.

Fig. 4. 8x8 FED Builder with a two-rail network.

Figure 3.10: Block diagram of the Pixel front end control system. Note that the total number of CCU nodes is 9 for the BPix and 5 for the FPix.

Figure 7.2: Muon reconstruction efficiency as a function of pseudorapidity for selected values of pT . Left panel: standalone reconstruction (using only hits from the muon system with a vertex constraint). Right panel: global reconstruction (using hits from both the muon system and the tracker).

Full text

University of Nebraska - Lincoln University of Nebraska - Lincoln
DigitalCommons@University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln
Kenneth Bloom Publications Research Papers in Physics and Astronomy
2008
The CMS experiment at the CERN LHC The CMS experiment at the CERN LHC
S. Chatrchyan
Yerevan Physics Institute, Yerevan, Armenia
Kenneth A. Bloom
University of Nebraska-Lincoln
, kenbloom@unl.edu
Brian Bockelman
University of Nebraska-Lincoln
, bbockelman2@unl.edu
Daniel R. Claes
University of Nebraska-Lincoln
, dclaes@unl.edu
Aaron Dominguez
University of Nebraska-Lincoln
, aarond@unl.edu
See next page for additional authors
Follow this and additional works at: https://digitalcommons.unl.edu/physicsbloom
Part of the Physics Commons
Chatrchyan, S.; Bloom, Kenneth A.; Bockelman, Brian; Claes, Daniel R.; Dominguez, Aaron; Eads, Michael;
Furukawa, Makoto; Keller, J.; Kelly, T.; Lundstedt, Carl; Malik, Sudhir; Snow, Gregory; Swanson, David R.;
and Collaboration, CMS, "The CMS experiment at the CERN LHC" (2008).
Kenneth Bloom Publications
.
282.
https://digitalcommons.unl.edu/physicsbloom/282
This Article is brought to you for free and open access by the Research Papers in Physics and Astronomy at
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Authors Authors
S. Chatrchyan, Kenneth A. Bloom, Brian Bockelman, Daniel R. Claes, Aaron Dominguez, Michael Eads,
Makoto Furukawa, J. Keller, T. Kelly, Carl Lundstedt, Sudhir Malik, Gregory Snow, David R. Swanson, and
CMS Collaboration
This article is available at DigitalCommons@University of Nebraska - Lincoln: https://digitalcommons.unl.edu/
physicsbloom/282

PUBLISHED BY INSTITUTE OF PHYSICS PUBLISHING AND SISSA
RECEIVED: January 9, 2008
ACCEPTED: May 18, 2008
PUBLISHED: August 14, 2008
THE CERN LARGE HADRON COLLIDER: ACCELERATOR AND EXPERIMENTS
The CMS experiment at the CERN LHC
CMS Collaboration
ABSTRACT: The Compact Muon Solenoid (CMS) detector is described. The detector operates at
the Large Hadron Collider (LHC) at CERN. It was conceived to study proton-proton (and lead-
lead) collisions at a centre-of-mass energy of 14 TeV (5.5 TeV nucleon-nucleon) and at luminosi-
ties up to 10
34
cm
−2
s
−1
(10
27
cm
−2
s
−1
). At the core of the CMS detector sits a high-magnetic-
field and large-bore superconducting solenoid surrounding an all-silicon pixel and strip tracker, a
lead-tungstate scintillating-crystals electromagnetic calorimeter, and a brass-scintillator sampling
hadron calorimeter. The iron yoke of the flux-return is instrumented with four stations of muon
detectors covering most of the 4π solid angle. Forward sampling calorimeters extend the pseudo-
rapidity coverage to high values (|η| ≤ 5) assuring very good hermeticity. The overall dimensions
of the CMS detector are a length of 21.6 m, a diameter of 14.6 m and a total weight of 12500 t.
KEYWORDS: Instrumentation for particle accelerators and storage rings - high energy; Gaseous
detectors; Scintillators, scintillation and light emission processes; Solid state detectors;
Calorimeters; Gamma detectors; Large detector systems for particle and astroparticle physics;
Particle identification methods; Particle tracking detectors; Spectrometers; Analogue electronic
circuits; Control and monitor systems online; Data acquisition circuits; Data acquisition concepts;
Detector control systems; Digital electronic circuits; Digital signal processing; Electronic detector
readout concepts; Front-end electronics for detector readout; Modular electronics; Online farms
and online filtering; Optical detector readout concepts; Trigger concepts and systems; VLSI
circuits; Analysis and statistical methods; Computing; Data processing methods; Data reduction
methods; Pattern recognition, cluster finding, calibration and fitting methods; Software
architectures; Detector alignment and calibration methods; Detector cooling and
thermo-stabilization; Detector design and construction technologies and materials; Detector
grounding; Manufacturing; Overall mechanics design; Special cables; Voltage distributions.
© 2008 IOP Publishing Ltd and SISSA http://www.iop.org/EJ/jinst/
Published in Journal of Instrumentation 3 (2008) S08004; doi: 10.1088/1748-0221/3/08/S08004 (U.S. Government document)
See page XX for University of Nebraska-Lincoln authors.

CMS Collaboration
Yerevan Physics Institute, Yerevan, Armenia
S. Chatrchyan, G. Hmayakyan, V. Khachatryan, A.M. Sirunyan
Institut für Hochenergiephysik der OeAW, Wien, Austria
W. Adam, T. Bauer, T. Bergauer, H. Bergauer, M. Dragicevic, J. Erö, M. Friedl, R. Frühwirth,
V.M. Ghete, P. Glaser, C. Hartl, N. Hoermann, J. Hrubec, S. Hänsel, M. Jeitler, K. Kast-
ner, M. Krammer, I. Magrans de Abril, M. Markytan, I. Mikulec, B. Neuherz, T. Nöbauer,
M. Oberegger, M. Padrta, M. Pernicka, P. Porth, H. Rohringer, S. Schmid, T. Schreiner, R. Stark,
H. Steininger, J. Strauss, A. Taurok, D. Uhl, W. Waltenberger, G. Walzel, E. Widl, C.-E. Wulz
Byelorussian State University, Minsk, Belarus
V. Petrov, V. Prosolovich
National Centre for Particle and High Energy Physics, Minsk, Belarus
V. Chekhovsky, O. Dvornikov, I. Emeliantchik, A. Litomin, V. Makarenko, I. Marfin, V. Mossolov,
N. Shumeiko, A. Solin, R. Stefanovitch, J. Suarez Gonzalez, A. Tikhonov
Research Institute for Nuclear Problems, Minsk, Belarus
A. Fedorov, M. Korzhik, O. Missevitch, R. Zuyeuski
Universiteit Antwerpen, Antwerpen, Belgium
W. Beaumont, M. Cardaci, E. De Langhe, E.A. De Wolf, E. Delmeire, S. Ochesanu, M. Tasevsky,
P. Van Mechelen
Vrije Universiteit Brussel, Brussel, Belgium
J. D’Hondt, S. De Weirdt, O. Devroede, R. Goorens, S. Hannaert, J. Heyninck, J. Maes,
M.U. Mozer, S. Tavernier, W. Van Doninck,
1
L. Van Lancker, P. Van Mulders, I. Villella,
C. Wastiels, C. Yu
Université Libre de Bruxelles, Bruxelles, Belgium
O. Bouhali, O. Charaf, B. Clerbaux, P. De Harenne, G. De Lentdecker, J.P. Dewulf, S. Elgammal,
R. Gindroz, G.H. Hammad, T. Mahmoud, L. Neukermans, M. Pins, R. Pins, S. Rugovac,
J. Stefanescu, V. Sundararajan, C. Vander Velde, P. Vanlaer, J. Wickens
– ii –

Ghent University, Ghent, Belgium
M. Tytgat
Université Catholique de Louvain, Louvain-la-Neuve, Belgium
S. Assouak, J.L. Bonnet, G. Bruno, J. Caudron, B. De Callatay, J. De Favereau De Jeneret,
S. De Visscher, P. Demin, D. Favart, C. Felix, B. Florins, E. Forton, A. Giammanco, G. Grégoire,
M. Jonckman, D. Kcira, T. Keutgen, V. Lemaitre, D. Michotte, O. Militaru, S. Ovyn, T. Pierzchala,
K. Piotrzkowski, V. Roberfroid, X. Rouby, N. Schul, O. Van der Aa
Université de Mons-Hainaut, Mons, Belgium
N. Beliy, E. Daubie, P. Herquet
Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, Brazil
G. Alves, M.E. Pol, M.H.G. Souza
Instituto de Fisica - Universidade Federal do Rio de Janeiro,
Rio de Janeiro, Brazil
M. Vaz
Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
D. De Jesus Damiao, V. Oguri, A. Santoro, A. Sznajder
Instituto de Fisica Teorica-Universidade Estadual Paulista,
Sao Paulo, Brazil
E. De Moraes Gregores,
2
R.L. Iope, S.F. Novaes, T. Tomei
Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
T. Anguelov, G. Antchev, I. Atanasov, J. Damgov, N. Darmenov,
1
L. Dimitrov, V. Genchev,
1
P. Iaydjiev, A. Marinov, S. Piperov, S. Stoykova, G. Sultanov, R. Trayanov, I. Vankov
University of Sofia, Sofia, Bulgaria
C. Cheshkov, A. Dimitrov, M. Dyulendarova, I. Glushkov, V. Kozhuharov, L. Litov, M. Makariev,
E. Marinova, S. Markov, M. Mateev, I. Nasteva, B. Pavlov, P. Petev, P. Petkov, V. Spassov,
Z. Toteva,
1
V. Velev, V. Verguilov
Institute of High Energy Physics, Beijing, China
J.G. Bian, G.M. Chen, H.S. Chen, M. Chen, C.H. Jiang, B. Liu, X.Y. Shen, H.S. Sun, J. Tao,
J. Wang, M. Yang, Z. Zhang, W.R. Zhao, H.L. Zhuang
Peking University, Beijing, China
Y. Ban, J. Cai, Y.C. Ge, S. Liu, H.T. Liu, L. Liu, S.J. Qian, Q. Wang, Z.H. Xue, Z.C. Yang, Y.L. Ye,
J. Ying
– iii –

Frequently asked questions

Q1. What is the core of the CMS detector?

At the core of the CMS detector sits a high-magneticfield and large-bore superconducting solenoid surrounding an all-silicon pixel and strip tracker, a lead-tungstate scintillating-crystals electromagnetic calorimeter, and a brass-scintillator sampling hadron calorimeter. 

Q2. What is the purpose of the CMS detector?

It was conceived to study proton-proton (and leadlead) collisions at a centre-of-mass energy of 14 TeV (5.5 TeV nucleon-nucleon) and at luminosities up to 1034 cm−2s−1 (1027 cm−2s−1).