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• W2783647223 abstract "The harsh radiation environment, in which detectors will have to operate during the high luminosity phase of the Large Hadron Collider, represents a crucial challenge for many calorimeter technologies. In the Compact Muon Solenoid (CMS) forward calorimeters, ionizing doses and hadron fluences will reach up to 300 kGy (at a dose rate of 30 Gy/h) and 2 × 10 <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>14</sup> cm <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>-2</sup> , respectively, at the pseudorapidity region of |η|= 2.6. To evaluate the evolution of the CMS electromagnetic calorimeter performance in such conditions, a set of PbWO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>4</sub> crystals, which had previously been exposed to 24 GeV protons up to integrated fluences between 2.1 × 10 <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>13</sup> cm <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>-2</sup> and 1.3 × 10 <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>14</sup> cm <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>-2</sup> , has been studied in beam tests. A degradation of the energy resolution and a nonlinear response to electron showers are observed in damaged crystals. Direct measurements of the light output from the crystals show the amplitude decreasing and pulse becoming faster as the fluence increases. The evolution of the performance of the PbWO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>4</sub> crystals has been well understood and parameterized in terms of increasing light absorption inside the crystal volume. A double-sided readout configuration, in which two identical photodetectors are coupled to the opposite ends of each crystal, has also been tested. The separate and simultaneous readout of the light from the two sides of the crystal allows us to correct for longitudinal shower fluctuations and to mitigate the degradation of energy resolution in highly damaged crystals. The nonlinear response to electromagnetic showers, arising from high nonuniformity of light collection efficiency along the longitudinal axis of irradiated crystals, can also be corrected by means of the double-sided readout technique." @default.
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• W2783647223 date "2018-08-01" @default.
• W2783647223 modified "2023-10-14" @default.
• W2783647223 title "Predicting the Performance of the CMS Precision PbWO4 Electromagnetic Calorimeter in the HL-LHC Era From Test Beam Results on Irradiated Crystals" @default.
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• W2783647223 doi "https://doi.org/10.1109/tns.2018.2791842" @default.
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