A Preshower Photon Multiplicity Detector for the WA98 Experiment
M.M. Aggarwal, A. Agnihotri, Z. Ahammed, P.V.K.S. Baba, S.K. Badyal,, K.B. Bhalla, V.S. Bhatia, S. Chattopadhyay, A.C. Das, M.R. Dutta Majumdar,, M.S. Ganti, T.K. Ghosh, S.K. Gupta, H.H. Gutbrod, S. Kachroo, B.W. Kolb, V., Kumar, I. Langbein, D.P. Mahapatra, G.C. Mishra
TL;DR
This paper describes the development and testing of a high granularity preshower detector for photon measurement in heavy-ion collisions at CERN, achieving around 70% photon counting efficiency.
Contribution
It introduces a novel preshower detector with improved imaging and efficiency for photon detection in high multiplicity environments.
Findings
Photon counting efficiency of 68% in central collisions
Photon counting efficiency of 73% in peripheral collisions
Effective rejection of minimum ionizing particles
Abstract
A high granularity preshower detector has been fabricated and installed in the WA98 Experiment at the CERN SPS for measuring the spatial distribution of photons produced in the forward region in lead ion induced interactions. Photons are counted by detecting the preshower signal in plastic scintillator pads placed behind a 3 radiation length thick lead converter and applying a threshold on the scintillator signal to reject the minimum ionizing particles. Techniques to improve the imaging of the fibre and performance of the detector in the high multiplicity environment of lead-lead collisions are described. Using Monte-Carlo simulation methods and test beam data of pi- and e- at various energies the photon counting efficiency is estimated to be 68% for central and 73% for peripheral Pb+Pb collisions.
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