Performance Studies of Prototype II for the CASTOR forward Calorimeter at the CMS Experiment

TL;DR

This paper evaluates the performance of the second prototype of the CASTOR forward calorimeter at CMS, focusing on energy and spatial resolution with various particles, and compares two photodetector types based on beam test results.

Contribution

It provides new performance data for the CASTOR calorimeter prototype, including energy linearity, resolution, and photodetector comparison at CERN beam tests.

Findings

Energy resolution and linearity characterized for electrons, pions, and muons.

Photodetector response comparison between APDs and PMTs.

Spatial resolution measurements for electromagnetic and hadronic showers.

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.