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The importance of hard X-ray astronomy (>10 keV) is now widely recognized. Recently both ESA (Cosmic Vision) and NASA (Decadal Survey) have indicated in their guidelines for Xand γ-ray astronomy in the next decade the development of innovative instrumentation operating in the hard Xand soft gamma ray range where important scientific issues are still open, exploiting high sensitivity for spectroscopic imaging and polarimetric observations. In this framework, the development of new focusing optics based on Laue lenses operating from ~60 keV up to a few MeV is particularly challenging. We describe the design concepts and the undergoing development of a three dimensional (3D) position sensitive device suitable for use as the basic unit of a high efficiency focal plane detector for a Laue lens telescope. The sensitive unit is a drift strip detector based on a CZT crystal, (19×8 mm area, 2.4 mm thick), irradiated transversally to the electric field direction. The anode is segmented into 8 detection cells, each comprising one collecting strip and 8 drift strips. The drift strips are biased by a voltage divider, whereas the anode strips are held at 0 V. The cathode is divided in 4 horizontal strips for the reconstruction of the Z interaction position. The 3D prototype will be made by packing 8 linear modules, each composed of one basic sensitive unit, bonded onto a supporting layer. The readout electronics will implement the new RENA-3 Asic and the data handling system will use custom designed FPGA based electronics to provide both the ASIC operation and the acquisition logic. The Extreme sky: Sampling the Universe above 10 keV extremesky2009 Otranto (Lecce) Italy October 13-17, 2009

A 3D CZT prototype for Laue lens telescope