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The growth of Supermassive Black Holes powering luminous quasars at the Epoch of Reionization openParEoR comma z>6closePar is a hot topic in astrophysics. These quasars are being characterized with large multiwavelength campaigns with current flagship observatories. X-ray observations performed so far provided mostly < 15 counts in 0.5-10 keV spectra and thus a poor characterization of their properties. We propose HYPERION comma a 2.3 Ms Multi-Year Heritage programme comma to dramatically improve data quality to 100 counts for 15 luminous quasars at EoR comma delivering unprecedented constraints on nuclear properties comma accretion comma ejection comma disc-corona complex. It will nicely complement observations at other wavelengths enabling meaningful X-ray spectroscopic studies at EoR to begin.

在再电离时代（Epoch of Reionization, EoR，红移z>6），驱动明亮类星体的超大质量黑洞（Supermassive Black Holes）的演化是天体物理学领域的前沿研究热点。目前，这类类星体正依托当前旗舰级天文台，通过多波段大型观测项目开展特性表征工作。截至目前开展的X射线（X-ray）观测中，多数样本在0.5~10 keV能段的光谱计数仅不足15，因此对其物理特性的表征精度较为有限。我们提出HYPERION项目——一项时长2.3兆秒的多年遗产观测项目——旨在将EoR阶段15颗明亮类星体的X射线光谱计数提升至100，从而对其核心物理特性、吸积过程、喷逸过程以及吸积盘-冕层复合体（disc-corona complex）提供前所未有的观测约束。该项目将有效补充其他波段的观测数据，为EoR阶段首个具备科学价值的X射线光谱学研究铺平道路。