Istituto dei materiali per l'elettronica ed il magnetismo     
Caroli E., Auricchio N., Budtz-Jorgensen C., Curado Da Silva R., Del Sordo S., Kuvvetli I., Milano L., Nataluccio L., Quadrini E., Stephen J., Zanichelli M., Zappettini A. Development of a CZT High Efficiency Detector with Three Dimensional Spatial Resolution for Hard X Ray Astronomy. In: NSS/MIC/RTSD 2011 - 18TH INTERNATIONAL WORKSHOP ON ROOM-TEMPERATURE SEMICONDUCTOR DETECTORS (Valencia, Spain, 23-29 Ottobre 2011).
For next decades both ESA and NASA have indicated the development of innovative instrumentation operating in the hard X- and soft gamma ray range as a key issue in this field, where important scientific problems are still open. The new instrumentation shall exploit high sensitivity both for spectroscopic imaging and for polarimetry that is currently recognized as a key parameter in the understanding of the nature of high energy cosmic emissions. In this framework, the development of new focusing optics based on wide band Laue lenses operating from ~60 keV up to several hundred keV is particularly challenging. These new X ray optics require really high performance focal plane detector in order to exploit at the best their intrinsic capabilities. . We describe the status of the integration of a 3D position sensitive detector prototype suitable as the basic module for a high efficiency Laue lens focal plane detector and the results obtained during first tests. In fact the same detector configuration is also under study to built a balloon prototype dedicated to perform the first high significance measurement of the polarization status of the Crab in the hard X ray regime between 100 and 500 keV (see E. Caroli, et al, this conference). The prototype is made by packing 8 linear modules, each composed of one basic sensitive unit, bonded onto a supporting thin ceramic layer. Each unit is a drift strip detector based on a CZT crystal, (198 mm2 area, 2.4 mm thick), irradiated transversally to the electric field direction. The anode is segmented into 4 detection cells, each comprising one collecting strip and 8 drift strips. The drift strips are biased by a voltage divider. The cathode, is divided in 4 horizontal strips for the reconstruction of the Z position. The detector readout electronics is based on 3 RENA-3 Asics's and the data handling system use a custom designed FPGA based electronics to provide both the ASIC operation and the acquisition logic.
Subject CZT
X-ray radiation detector

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