Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011xau5.confe...4a&link_type=abstract
"The Second Ferrara Workshop on "X-ray Astrophysics up to 511 keV", held in Ferrara (Italy), September 14 - 16, 2011, article #4
Astronomy and Astrophysics
Astrophysics
Scientific paper
The development of innovative instrumentation operating in the hard X- and soft gamma-ray range, where important scientific issues are still open, exploiting high sensitivity (50-100 times better than current instruments) for spectroscopic imaging and polarimetric observations is very challenging. In this framework, the progress of new focusing optics, as wide band Laue lenses operating from ~60 keV up to several hundred keV is particularly important. The innovative high energy focusing optics require focal plane detectors with high efficiency, fine spectroscopy and spatial resolution from a few hundreds of microns to the mm scale in order to exploit to the maximum the intrinsic capabilities of these new high energy telescopes. We present a short review of proposed semiconductor focal plane detector configurations, which allow to satisfy these requirements. In particular we describe the development of a CZT three dimensional position sensitive device suitable as a high efficiency focal plane detector for a Laue lens telescope and the results obtained during preliminary functional tests carried out on a prototype under construction. The sensitive unit of this prototype is a drift strip detector based on a CZT crystal with dimension 19 x 8 x 2.4 mm, irradiated transversally to the electric field direction. The anode is segmented into 4 detection cells, each comprising one collecting strip and 8 drift strips having a pitch of 300 micron. The drift strips are biased by a voltage divider. The cathode is divided into 4 horizontal strips for the reconstruction of the third coordinate of the interaction, making the detector equivalent to a stack of thinner CZT horizontal layers with the advantage of not having any passive material between each layer.
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