The AGILE silicon tracker: testbeam results of the prototype silicon detector

Physics

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Scientific paper

AGILE (Light Imager for Gamma-ray Astrophysics) is a small scientific satellite for the detection of cosmic γ-ray sources in the energy range 30MeV-50GeV with a very large 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 heart of the AGILE scientific instrument is a silicon-tungsten tracker made of 14 planes of single sided silicon detectors for a total of 43000 readout channels. Each detector has a dimension of 9.5×9.5cm2 and a thickness of 410μm.
We present here a detailed description of the performance of the detector prototype during a testbeam 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 and off-axis incident charged particles. The measured 40μm resolution for a large range of incident angles will provide an excellent angular resolution for cosmic γ-ray imaging.

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