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Towards a response function for the COSI anticoincidence system: preliminary results from Geant4 simulations by Ciabattoni, Alex; Fioretti, Valentina; Tomsick, John; Zoglauer, Andreas; Jean, Pierre; Franco, Daniel Alvarez; von Ballmoos, Peter; Bulgarelli, Andrea; Vignali, Cristian; Parmiggiani, Nicolò; Panebianco, Gabriele; Castaldini, Luca is a scholarly article available to read on EtoBox.

What is Towards a response function for the COSI anticoincidence system: preliminary results from Geant4 simulations about?

The Compton Spectrometer and Imager (COSI) is an upcoming NASA Small Explorer satellite mission scheduled for launch in 2027 and designed to conduct an all-sky survey in the energy range of 0.2-5 MeV. Its instrument consists of an array of germanium detectors surrounded on four sides and underneath by active shields that work as anticoincidence system (ACS) to reduce the contribution of background events in the detectors. These shields are composed of bismuth germanium oxide (BGO), a scintillator material, coupled with Silicon photomultipliers, aimed to collect optical photons produced from interaction of ionizing particles in the BGO and convert them into an electric signal. The reference simulation framework for COSI is MEGAlib, a set of software tools based on the Geant4 toolkit. The interaction point of the incoming radiation, the design of the ACS modules and the BGO surface treatment change the light collection and the overall shielding accuracy. The use of the Geant4 optical physics library, with the simulation of the scintillation process, is mandatory for a more realistic evaluation of the ACS performances. However, including the optical processes in MEGAlib would dramatic

Author

Ciabattoni, Alex; Fioretti, Valentina; Tomsick, John; Zoglauer, Andreas; Jean, Pierre; Franco, Daniel Alvarez; von Ballmoos, Peter; Bulgarelli, Andrea; Vignali, Cristian; Parmiggiani, Nicolò; Panebianco, Gabriele; Castaldini, Luca

Published

2024

Language

EN