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Introduction
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The CMS detector is a large general-purpose detector at the LHC, CERN.
CMS consists of layers of detector material that exploit the different properties of particles to catch and measure the energy or momentum of each one.
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Tracker detector
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A particle emerging from the collision and travelling outwards will first encounter the tracking system, made of silicon pixels and silicon strip detectors.
The tracker accurately measures the positions of passing charged particles allowing physicists to reconstruct their tracks.
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Electromagnetic Calorimeter (ECAL)
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Hadron Calorimeter (HCAL)
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The HCAL measures the energy of “hadrons”, particles made of quarks and gluons (for example protons, neutrons, pions and kaons).
The HCAL is hermetic, made up of a barrel, endcaps, and forrward and outer detectors.
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Superconducting magnet
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The CMS magnet is the central device around which the experiment is built, with a 3.7 Tesla magnetic field.
The magnet’s job is to bend the paths of particles emerging from high-energy collisions.
The strong magnetic field, combined with high-precision position measurements in the tracker and muon detectors, this allows accurate measurement of the momentum of even high-energy particles.
The CMS magnet is a superconducting solenoid.
The tracker and calorimeter detectors (ECAL and HCAL) fit snugly inside the magnet.
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Muon detectors
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