用于gamma ray成像的几十皮秒时间分辨率的自旋晶体的设计研究：ClearMind探测器
Design study of a scintronic crystal targeting tens of picoseconds time resolution for gamma ray imaging: the ClearMind detector
摘要：
我们描述了一种新的伽马射线扫描探测器的概念，其目标时间分辨率为25 ps FWHM的顺序，具有毫米体积重建和高探测效率。它的设计包括一个大的PbWO 4晶体和一个直接沉积在其上的有效的光电阴极，由于光电阴极的折射率比晶体的折射率高，这种设计消除了光子在晶体/光电探测器光学界面处的全反射效应，从而大大改善了晶体和光电探测器之间的光学耦合。这允许有效地检测由PbWO 4中的511 keV光电转换产生的切伦科夫光，并优化检测器的时间分辨率。此外，由PbWO 4额外产生的低产量、快速闪烁光将探测到的光子统计增加了10倍，从而促进晶体内伽马射线相互作用的精确（三维）定位，并提供对沉积能量的公平测量。本文列出了必须克服的技术挑战，以建立这种scintronic探测器。我们表明，所有的关键技术，现在已经证明，目前的初步蒙特卡罗模拟，其中包括一个创新的事件重建算法，以支持声称的性能检测器的结果。
英文摘要：
We describe the concept of a new gamma ray scintronic detector targeting a time resolution of the order of 25 ps FWHM, with millimetric volume reconstruction and high detection efficiency. Its design consists of a monolithic large PbWO4 scintillating crystal with an efficient photocathode directly deposited on it. With an index of refraction higher for the photocathode than for the crystal, this design negates the total reflection effect of optical photons at the crystal/photo-detector optical interface, and thus largely improves optical coupling between the crystal and the photodetector. This allows to detect efficiently the Cherenkov light produced by 511 keV photoelectric conversions in PbWO4, and to optimize the detector time resolution. Furthermore, the low-yield, fast scintillation light produced additionally by PbWO4 increases the detected photon statistics by a factor 10, thus fostering accurate (3 dimensional) localization of the gamma ray interaction within the crystal and providing a fair measurement of the deposited energy. This paper lists the technological challenges that have to be overcome in order to build this scintronic detector. We show that all the key technologies have now been demonstrated and present results of a preliminary Monte Carlo simulation, which include an innovative event reconstruction algorithm to support the claimed performances of the detector.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
