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An electromagnetic calorimeter (ECAL) is one specifically designed to measure the energy of particles that interact primarily via the electromagnetic interaction such as electrons, positrons and photons. A hadronic calorimeter (HCAL) is one designed to measure particles that interact via the strong nuclear force.
The innermost layer is a silicon-based tracker. Surrounding it is a scintillating crystal electromagnetic calorimeter, which is itself surrounded with a sampling calorimeter for hadrons. The tracker and the calorimetry are compact enough to fit inside the CMS solenoid, which generates a powerful magnetic field of 3.8 T. Outside the magnet are ...
The extended barrel section of the hadronic calorimeter. The calorimeters [1] [2] [3] are situated outside the solenoidal magnet that surrounds the Inner Detector. Their purpose is to measure the energy from particles by absorbing it. There are two basic calorimeter systems: an inner electromagnetic calorimeter and an outer hadronic calorimeter ...
Electromagnetic calorimeter (ECL) [12] a highly segmented array of thallium-doped caesium iodide CsI crystals assembled in a projective geometry to measure energies of the neutral final state particles such as photons, and neutrons, as well as PID.
Electromagnetic Calorimeter (EMC) Made from 6580 CsI crystals, the EMC identifies electrons and antielectrons, which allows for the reconstruction of the particle tracks of photons (and thus of neutral pions (π 0)) and of "long Kaons" (K L), which are also electrically neutral. Magnet
The calorimeter systems for high energy physics experiments usually consist of three main subsystems: electromagnetic calorimeter (ECAL) to detect electromagnetic showers produced by electrons (or positrons) and photons, hadronic calorimeter (HCAL) to measure hadron-induced showers, and muon tracker (or so-called tail catcher) to identify ...
The hadronic calorimeter works in much the same way except the hadronic calorimeter uses steel in place of lead. [9] Each calorimeter forms a wedge, which consists of both an electromagnetic calorimeter and a hadronic calorimeter. These wedges are about 2.4 m (8 ft) in length and are arranged around the solenoid. [29]
Uranium was chosen as an absorber so that the calorimeter would be compensating. [5] Electrons and photons deposit energy differently from hadrons, but in a compensating calorimeter the response (e) for an electromagnetic cascade is equal to the response (h) for a hadronic cascade of the same energy (i.e. e/h = 1). [9]
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