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Simulation of the AGILE gamma-ray imaging detector ... - Cnr

Simulation of the AGILE gamma-ray imaging detector ... - Cnr

Simulation of the AGILE gamma-ray imaging detector ... -

Nuclear Instruments and Methods in Physics Research A 486 (2002) 610–622 Simulation ofthe AGILE gamma-ray imaging detector performance: part I Francesco Longo a,d , Veronica Cocco b,d, *, Marco Tavani c,b,d a Universit"a degli Studi di Ferrara and INFN Sezione di Ferrara, Italy b Universit"a degli Studi ‘‘Tor Vergata’’ and INFN Sezione di Roma II, Italy c Istituto di Fisica Cosmica, CNR, Milano, Italy d Consorzio Interuniversitario Fisica Spaziale, Torino, Italy Received 26 July 2001; received in revised form 25 October 2001; accepted 20 November 2001 Abstract We present in this paper the results ofa comprehensive GEANT simulation ofthe Gamma-Ray Imaging Detector (GRID) being developed for the AGILE space astrophysics mission. The GRID is designed to be sensitive in the B30 MeV–50 GeV energy range, with excellent imaging and timing capabilities, and with a very large field-of-view (B3 sr). In this paper (Paper I) we present the GRID baseline geometry, a model for the charged particle and albedophoton backgrounds for an equatorial orbit of 550–600 km altitude, and the main results of the first level (Level-1 Trigger) on-board data processing. Our simulations show that the GRID Level-1 data processing is expected to be capable ofdecreasing by a factor ofB20 the charged particle background (from B2 kHz to below 100 Hz), and by a factor of B30 the albedo-photon background. The gamma-ray photon detection efficiency by the imaging GRID is simulated to be particularly efficient, varying between 39% and 17% depending on photon energies and incident directions. r 2001 Elsevier Science B.V. All rights reserved. PACS: 95.85.Pw; 95.55.ka; 95.75. z Keywords: Gamma-ray instruments; Monte Carlo simulation 1. Introduction AGILE is an Italian Space Agency (ASI) Small Scientific Mission dedicated to high-energy astrophysics [1,2]. The AGILE instrument is designed to detect and image photons in the B30 MeV– *Corresponding author. Dip. di Fisica, Universita di Roma ‘‘Tor Vergata’’, Via della Ricerca Scientifica 1, 00133 Roma, Italy. Tel.: +39-6-7259-4718; fax: +39-6-7259-4647. E-mail address: veronica.cocco@roma2.infn.it (V. Cocco). 50 GeV and 10–40 keV energy bands, with excellent spatial resolution and timing capability, and a very large field ofview covering B 1 5 ofthe entire sky at energies above 30 MeV [3]. Primary scientific goals include the study ofAGNs, gamma-ray bursts, Galactic sources, unidentified gamma-ray sources, diffuse Galactic and extragalactic gamma-ray emission, high-precision timing studies and Quantum Gravity testing [3]. The AGILE Gamma-Ray Imaging Detector (GRID) consists ofa Silicon-Tungsten Tracker, a 0168-9002/01/$ - see front matter r 2001 Elsevier Science B.V. All rights reserved. PII: S 0168-9002(01)02159-3

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