超快脉冲辐射探测是核辐射探测技术的重要前沿领域，随着惯性约束核聚变、空间辐射探测、核反应动力学等重大科学研究的迅速发展，对现有辐射探测材料的性能提出了更高要求。Yb:YAG晶体作为一种新型超快无机闪烁材料，近年来已成为超快脉冲辐射探测技术研究的热点。但Yb:YAG闪烁晶体在工艺制备、性能评价以及探测器集成等方面仍面临一系列基础科学问题急需突破。为此，本项目拟重点研究如下关键科学问题：1）优化晶体生长及掺杂工艺，突破大尺寸、高质量、快响应的Yb:YAG系列晶体制备技术；2）研究Yb:YAG晶体在不同类型辐射场中的辐射特性和损伤机理；3）系统研究晶体的生长工艺与闪烁特性、辐射特性、辐射损伤之间的内在联系和物理规律；4）发展基于Yb:YAG的脉冲辐射探测技术，揭示强流脉冲辐射场中的物理规律，解决超快过程诊断中的物理问题。研究成果在可控氘氚聚变反应等超快物理过程研究领域具有广泛的应用推广前景。

Ultrafast pulse radiation detection technology is the front area in the field ofradiation detection. With the rapid development of these important scientific research fields such as inertial confinement fusion, space radiation detection, and nuclear reaction dynamics, high properties demands are required for radiation detection materials. As a new ultrafast inorganic scintillator, Yb:YAG crystal has become the hot issue of ultrafast pulsed radiation detection. However, many basic scientific problems of Yb:YAG crystal, such as growth process, crystal property evaluation, and detector integration need to be resolved urgently.Therefore, this project will focus on the following scientific issues: (1) Optimize the growth and doping techniques, and penetrate the critical techniques of large-size, high-quality and fast time response Yb:YAG series crystal. (2) Study the radiation characteristics and radiation damage mechanism of Yb:YAG crystal in different radiation fields.(3) Study theinternal relationship and physical law between crystals growth process, scintillation properties, radiation characteristics andradiation damage systematically. (4) Develop the new pulsed radiation measurement theory and technique based on Yb:YAG crystal, discover physical laws in the high-intensity radiation field, and solve the physical problems in the ultrafast process diagnosis. This work shows a significant application prospect in the ultrafast physical process such as controllable Deuterium-Tritium fusion reaction.