Prototype testing of the silicon-tungsten tracker reveals improved angular resolution for gamma-ray detection, enhancing cosmic observations.
AGILE (LightImagerforGamma-rayAstrophysics) is a small scientific satellite for the detection of cosmicg-ray sources in the energy range 30 MeV-50 GeV with a very field of view (1/4 of the sky). It is planned to be operational in the years 2003-2006, a period in which no other γ-ray mission in the same energy range is foreseen. The AGILE scientific instrument is made of a silicon-tungsten Tracker, aCsI(Tl) Minicalorimeter, an Anticoincidence system and a X-ray imaging detector sensitive in the 10-40keV range. We present here a detailed description of the architectural design of the Silicon. Tracker with it strigger and readout logic, and the performance of the detector prototype during a test beam period at the CERN PS in May 2000. The Tracker performance is described in terms of position resolution and signal to noise ratio for on-axis and off-axis incident charged particles. The measured 40 μm resolution for a large range of incident angles will provide an excellent angular resolution for cosmic γ-ray imaging.
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