Abstract
The Projectile Spectator Detector (PSD) of the CBM experiment at the future FAIR facility is a compensating lead-scintillator calorimeter designed to measure the energy distribution of the forward going projectile nucleons and nuclei fragments (reaction spectators) produced close to the beam rapidity. The detector performance for the centrality and reaction plane determination is reviewed based on Monte-Carlo simulations of gold-gold collisions by means of four different heavy-ion event generators. The PSD energy resolution and the linearity of the response measured at CERN PS for the PSD supermodule consisting of 9 modules are presented. Predictions of the calorimeter radiation conditions at CBM and response measurement of one PSD module equipped with neutron irradiated MPPCs used for the light read out are discussed.
Highlights
The Compressed Baryonic Matter (CBM) experiment at the future Facility for Antiproton and Ion Research (FAIR) will investigate the region of the QCD phase diagram of high net-baryon densities studying heavy-ion collisions
Detector performance simulations suggest the use of Projectile Spectator Detector (PSD) to determine the main collision event characteristics
The impact parameter resolution for the centrality estimation is about 5–10% and the reaction plane resolution is below 40 degrees
Summary
The Compressed Baryonic Matter (CBM) experiment at the future Facility for Antiproton and Ion Research (FAIR) will investigate the region of the QCD phase diagram of high net-baryon densities studying heavy-ion collisions. The PSD calorimeter will provide information on the centrality and reaction plane orientation of the nucleus-nucleus collisions at the SIS-100 beam energy range of 2 - 10 AGeV with beam interaction rates up to 1 MHz [1]. PSD has a modular transverse structure consisting of 44 modules with a beam hole in the center of the calorimeter, see Fig. 1 (left). Each detector module has 5.6 hadron interaction lengths and transverse size of 20 × 20 cm. The module has the readout from 10 longitudinal sections that allows to measure the longitudinal hadron shower profile and ensure the uniformity of light collection along the module
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