The TARANIS XGRE Instrument : Preliminary Modeling and TGF Detection Rate Estimation
|Astro-Particules et Cosmologie (APC)|
|Auteur(s) supplémentaire(s)||F. Lebrun 3, P.-L. Blelly 1, R. Chipaux 4, F. Forme 1, D. Pailot 2, P. Laurent 3|
|Institution(s) supplémentaire(s)|| 1. IRAP, UPS-OMP CNRS, Toulouse, France. 2. APC/CNRS, Paris, France. 3. APC/CEA, Paris, France. 4. CEA, Saclay, France.|
The XGRE instrument on-board the TARANIS satellite is a key element of the payload with ambitious scientific objectives regarding Terrestrial Gamma Ray flashes (TGFs) and associated electron beams (TEBs). At the altitude of the satellite, the instruments will measure X and gamma rays produced from sources at lower altitude, and filtered by the atmosphere, together with secondary relativistic electrons. Such measurements give an indirect access to the characteristics of the source of the TGF. A model of the transport of these burst emissions through the atmosphere, of their interactions with the satellite, and of the response of the detectors is necessary.
A first step has been accomplished with the development of the MC-PEPTITA Monte Carlo model (see Sarria et al. 2015, JGRA) that simulates the transport of X/gamma-rays and relativistic electrons/positrons through the atmosphere, from the source region up to the altitude of the satellite. Using the GEANT4 toolkit, the next step needs to take into account the detection of the energetic particles by the three XGRE sensors. The model will be validated by comparison with laboratory experiments. We present some preliminary results of the XGRE detector model and an estimate of the expected XGRE TGF detection rate.