Perspectives for antideuterons search in Cosmic Rays with a helium pressurized calorimeter

The search for antideuterons in Cosmic Rays (CRs) addresses fundamental questions such as the nature of Dark Matter or the presence of primordial antimatter. The Pressurized Helium Scintillating Calorimeter for AntiMatter Identification (PHeSCAMI) project aims to identify low-energy antideuterons in CRs, through delayed annihilations within a helium target. The performance of a possible large-acceptance detector based on the detection technique of the PHeSCAMI project is presented. In particular, we developed a possible trigger logic and estimated the expected background rate for the proposed design, using a Monte Carlo simulation based on the Geant4 toolkit.