Abstract
We present results of the performance of the second prototype of the CASTOR quartz–tungsten sampling calorimeter, to be installed in the very forward region of the CMS experiment at the LHC. The energy linearity and resolution, as well as the spatial resolution of the prototype to electromagnetic and hadronic showers are studied with E=20–200 GeV electrons, E=20–350 GeV pions, and E=50, 150 GeV muons from beam tests carried out at CERN/SPS in 2004. The responses of the calorimeter using two different types of photodetectors (avalanche photodiodes APDs, and photomultiplier tubes PMTs) are compared.
Highlights
The CASTOR (Centauro And Strange Object Research) detector is a quartz-tungsten sampling calorimeter, which has been proposed for the study of the very forward rapidity region in heavy ion and proton-proton collisions in the multi-TeV range at the LHC [1]
The results of the beam test and simulation studies with CASTOR prototype I [4] prompted us to construct a second prototype using quartz plates, avalanche photodiodes (APDs) as well as photomultiplier tubes (PMTs), and air-core light-guides with inner reflective foil (Dupont polyester film reflector coated with AlO and reflection enhancing dielectric layer stack SiO2+TiO2)
The Cerenkov light produced by the passage of relativistic particles through the quartz medium is collected in sections along the length of the calorimeters and focused by air-core light guides onto the photodetector devices, APDs or PMTs
Summary
The CASTOR (Centauro And Strange Object Research) detector is a quartz-tungsten sampling calorimeter, which has been proposed for the study of the very forward rapidity region in heavy ion and proton-proton collisions in the multi-TeV range at the LHC [1]. We tested a new semi-octant (φ = 22.5◦) geometry of the readout unit in the electromagnetic section. The prototype II calorimeter consists of an electromagnetic (EM) and a hadronic (HAD) section, built in an octant sector (Fig. 1). Both calorimeters are constructed with successive layers of tungsten plates as absorber and fused silica quartz plates as active medium. The Cerenkov light produced by the passage of relativistic particles through the quartz medium is collected in sections along the length of the calorimeters and focused by air-core light guides onto the photodetector devices, APDs or PMTs
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