Abstract
Measurements of particle production at forward rapidities in high energy p-p, p-A and A-A collisions provide access to physics processes at very low Bjorken x. These measurements will allow to study the gluon saturation scale and improve our knowledge of parton distribution in nuclei. Specific requirements must be fulfilled for a calorimeter to successfully operate in high-multiplicity forward region within often stringent space limits. Here we present a study of a conceptual design of super-compact electromagnetic calorimeter being developed at Czech Technical University in Prague. The design of the sampling calorimeter is based on a sandwich structure of thin tungsten and scintillator layers oriented in parallel to the beam. Used optical readout of individual scintillator pads guaranties the required high radiation hardness of the detector. We present simulation of the expected performance of the optical pad readout together with overall detector performance. It is aimed for the detector to allow measuring of high energy photons (1<E<300 GeV) in forward rapidities (2.5 < η < 4).
Highlights
The aim of our project is, to develop new super-compact electromagnetic calorimeter (ECAL) for the forward region based on the tungsten-scintillator calorimetry for wide pseudorapidity range for photon energies up to E ≈ 300GeV [1]
The mechanical design of the sampling calorimeter is based on a sandwich structure of thin tungsten and scintillator cards oriented in parallel to the beam (Figure 1)
Due to variable granularity of the pad size the best resolution is in the first and the last layer while in the middle the signal is integrated at shower maximum
Summary
Forward rapidity region of high energy particle collisions offers opportunity for studying more details of physics at small Bjorken-x. Particles produced to this region originate dominantly from gluon interactions providing possibility to scan low-x gluon densities. Basic phenomena allowing to study the physics aspects in this region are forward π0 and jets production, prompt photon production, quarkonia and leptons from heavy quarks, etc. It will improve our knowledge of parton distribution in nuclei. The aim of our project is, to develop new super-compact electromagnetic calorimeter (ECAL) for the forward region based on the tungsten-scintillator calorimetry for wide pseudorapidity range for photon energies up to E ≈ 300GeV [1]
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