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We describe the concept of a new gamma ray scintronic detector targeting atime resolution of the order of 25 ps FWHM, with millimetric volumereconstruction and high detection efficiency. Its design consists of amonolithic large PbWO4 scintillating crystal with an efficient photocathodedirectly deposited on it. With an index of refraction higher for thephotocathode than for the crystal, this design negates the total reflectioneffect of optical photons at the crystal/photo-detector optical interface, andthus largely improves optical coupling between the crystal and thephotodetector. This allows to detect efficiently the Cherenkov light producedby 511 keV photoelectric conversions in PbWO4, and to optimize the detectortime resolution. Furthermore, the low-yield, fast scintillation light producedadditionally by PbWO4 increases the detected photon statistics by a factor 10,thus fostering accurate (3 dimensional) localization of the gamma rayinteraction within the crystal and providing a fair measurement of thedeposited energy. This paper lists the technological challenges that have to beovercome in order to build this scintronic detector. We show that all the keytechnologies have now been demonstrated and present results of a preliminaryMonte Carlo simulation, which include an innovative event reconstructionalgorithm to support the claimed performances of the detector.

Design study of a scintronic crystal targeting tens of picoseconds time resolution for gamma ray imaging: the ClearMind detector