The preshower detector of CMS at LHC

Abstract

A preshower detector aimed at neutral pion identification will be installed in the endcaps of CMS in front of the crystal calorimeter. The physics and the radiation environment impose strong requirements on this detector. Simulations and beam test results show good performance of the preshower used in association with the crystal calorimeter. Presented at Frontier detectors for Frontier Physics, 8th Pisa meeting on advanced detectors,

The Electromagnetic Calorimeter of CMS

“…There is one preshower disk [4] in front of each Ecal endcap, which allows separation. The silicon detectors (4300 in total) are organized in 2 planes per disk, the first has a Pb-layer of X as absorber in front, the second one of X .…”

Status of the Compact Muon Solenoid Detector at the Large Hadron Collider

“…The preshower detector [Tournefier(2001)] is located in front of the ECAL endcaps in the pseudorapidity range 1.65 < η < 2.61 and consists of two lead/silicon detector layers for π/γ separation. Its design was endorsed in March 2003.…”

The FoCal prototype—an extremely fine-grained electromagnetic calorimeter using CMOS pixel sensors

“…Such higher granularity will in addition greatly improve the position resolution of calorimetric measurements. Some of the more recent calorimeter implementations do in fact partially use higher granularity layers (strip detectors) to exploit these possibilities, as in the CMS pre-shower detector [3], and full three-dimensional shower reconstruction was used in the PAMELA space mission [4].…”