Advanced Telescope for High-Energy Astrophysics is a large-class astrophysics space mission selected by the European Space Agency to study the theme “Hot and Energetic Universe.” The mission essentially consists of a large effective area x-ray telescope and two detectors: the X-ray Integral Field Unit (X-IFU) and the Wide Field Imager (WFI). Both instruments require filters to shield from out-of-band radiation while providing high transparency to x-rays. The mission is presently in phase B; thus, to consolidate the preliminary design, investigated filter materials need to be properly characterized by experimental test campaigns. We report results from high-resolution x-ray transmission measurements performed using different synchrotron radiation beamlines to assess the filter calibration accuracy and mitigate the risk related to selecting a unique calibration facility. The main goals of these test campaigns are (i) to verify the compliance of the investigated filter design to the scientific requirements, (ii) to develop an accurate x-ray transmission model, and (iii) to start identifying suitable measurement facilities and achievable accuracy for the flight filters calibration program. In particular, the x-ray transmission model of the X-IFU and WFI filters has been refined within the edges of Al, C, N, and O by deriving the optical constants from two reference samples measured by synchrotron light. The achievable filter calibration accuracy has been estimated by evaluating the agreement between the best-fit according to the developed transmission model and the experimental data.

中文翻译：

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雅典娜研究的同步加速器X射线透射测量和滤波器建模

高能天体物理学高级望远镜是一项大型的天体物理学太空任务，是由欧洲航天局选定的，其研究主题为“热能高能宇宙”。该任务主要由一个大有效区域X射线望远镜和两个探测器组成：X射线积分场单元（X-IFU）和广域成像仪（WFI）。两种仪器都需要滤光片以屏蔽带外辐射，同时为X射线提供高透明度。该任务目前处于B阶段；因此，为了巩固初步设计，需要通过实验测试活动对被调查的过滤材料进行适当的表征。我们报告使用不同的同步加速器辐射束线进行的高分辨率X射线透射测量的结果，以评估滤波器的校准精度并减轻与选择独特的校准设施有关的风险。这些测试活动的主要目标是（i）验证所研究的滤光器设计是否符合科学要求；（ii）开发准确的X射线透射模型；以及（iii）开始确定合适的测量设备并且可以实现飞行过滤器校准程序的准确性。特别是，通过从同步加速器光测量的两个参考样品中推导光学常数，在Al，C，N和O的边缘内完善了X-IFU和WFI滤波器的X射线透射模型。