Dr Alexander Ivashkin (INR RAS)Dr Fedor Guber (INR RAS)
The parameters of Forward Hadron Calorimeter (FHCal) for MPD experiment at heavy ion collider NICA (Dubna, Russia) are discussed. The calorimeter will measure a geometry of heavy-ion collisions and also will be used for the trigger of the most peripheral events. FHCal consists of two equivalent parts placed left/right respective the beam collision point. Each FHCal part consists of 44 individual modules. This is a lead–scintillator compensating calorimeter with the light readout provided by WLS-fibers embedded in the grooves in the scintillator tiles. The longitudinal segmentation of the calorimeter modules requires 7 compact photodetectors in each module. The silicon photomultipliers, SiPMs are used for the readout. The results of the tests with cosmic muons are presented. The procedure of the absolute light yield evaluation in each longitudinal section is elaborated. The light yield of about 45-50 photoelectrons is obtained for the minimum ionizing particles crossed a single FHCal module section. While the electronic noise contribution is estimated of about very few photoelectrons. The time resolution of about 1 ns was measured for cosmic muons crossed one FHCal module. The obtained parameters of FHCal ensure the reliable trigger for detection of the hadrons with the energies 1- 5 GeV.
Dr Alexander Ivashkin (INR RAS)