The BADG3R prototype on board of a stratospheric balloon flight in the framework of the HEMERA program

New instruments for high energy astrophysics require detectors exploiting high dynamics, to cover a large energy band, and very high performance in terms of efficiency, Spectroscopy, imaging and timing. In addition, the requirement to be suitable for a large class of satellites and different mission scenarios needs that these detectors have a high modularity and compactness. In this perspective we had approved by ASI a project ("3D-CZT Module for spectroscopic imaging, timing and polarimetry in hard X-/soft ?-rays satellite mission - 3DCaTM"). This project is dedicated to develop an innovative 3D spectro-imager for hard X- and soft ?-rays based on 3D-CZT drift trip sensor units and implementing an innovative digital readout of signals to obtain unprecedented performance with three-dimensional spatial resolution (<0.5 mm), fine spectroscopy (1% FWHM at 511 keV), and high response uniformity (few %'s) with a limited number of electronics channels. In 2019 we proposed, in the framework of the H2020/HEMERA program, a stratospheric balloon flight of a small prototype (BADG3R) derived from the detector described above. This flight, now approved and scheduled for September 2022 for a launch from the ESRANGE Space Center, will be very important to assess the reliability of some new technological solution we implemented in the 3D-CZT spectroscopic-imager module. Furthermore, this flight would verify the flexibility and reliability of the new digital approach in a noisy pseudo-space environment.