An ESAF approach to JEM-EUSO end-to-end simulation studies

F. FENU; A. SANTANGELO; T. MERNIK; K. SHINOZAKI; D. NAUMOV; J. CALVO; S. DAGORET; G. MEDINA-TANCO; H. MIYAMOTO; A. D. SUPANITSKY; J. SZABELSKI

Conferencia; 31st Intenational Cosmic Ray Conference; 2009

JEM-EUSO stands for Extreme Universe Space Observatory on-board the JEM Exposure Facility of the International Space Station (ISS).The aim of JEM-EUSO is to detect the UV tracks emitted by Extreme Energy Cosmic Ray showers (EECR), with E > 5×10^19 eV, traversing the earth’s atmosphere. ESAF stands for EUSO Simulation & AnalysisFramework and was developed in the context of the EUSO mission to perform End-to-End simulations of EECR observed from space.We present in this paper a study performed to update the ESAF framework to the JEM-EUSO mission. We introduced in the code 1.) a parameterization of the optics that is a parameterization of the effective area and of the point spread function; 2.) the focal surface layout designed for the mission and the parameterizations of the advanced photomultiplier; 3.) several trigger algorithms whichaim at reducing the fake trigger rate to match the telemetry constrains. After summarizing the current status of ESAF updating, we will present some preliminary results on JEM-EUSO trigger efficiency obtained comparing different trigger algorithms.