Abstract
A new prototype of large area (20×20 mm 2) monolithic silicon telescope with an ultrathin Δ E stage (1 μm) has been built and tested. A particular mask for the ground electrode has been developed to improve the charge collection reducing the induction between the E and Δ E stages. A special designed preamplifier has been used for the readout of the signal from the Δ E stage to overcome the problem of the large input capacitance (40 nF). A rather low energy threshold charge discrimination has been obtained. Small side effects due to the electric field deformation near the ground electrode were observed and quantified.
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