使用单laser计量学重建NuSTAR点扩散函数
Reconstruction of the NuSTAR point spread function using single-laser metrology
摘要：
本文描述了一种方法，通过该方法，核光谱望远镜阵列（NuSTAR）X射线空间天文台的计量系统，它使用两个激光器来表征光学和焦平面台的相对运动，可以近似如果一个激光器故障。两个工作台由一个10米长的刚性桅杆隔开，桅杆会受到少量的热弯曲，为了产生不模糊的图像，需要进行补偿。我们通过档案观测参数分析桅杆运动的趋势，以发现桅杆运动在未来的观测是否可以预测。我们发现，通过使用太阳方位角（SAA），观测数据和轨道相位，我们可以模拟一个激光器的运动，通过平移由其他产生的轨道和应用修改得到的桅杆方面的解决方案，允许重建的最小失真的点扩散函数在大多数情况下。我们将实施模拟桅杆文件的生成，以及通常的NuSTAR数据减少管道，以备不时之需。这项工作的影响，以减少在未来的飞行任务，使用可部署的桅杆，以实现高能天文学所需的长焦距的计量激光故障在飞行任务的延长阶段的影响，实施激光计量系统的风险。
英文摘要：
This paper describes a method by which the metrology system of the Nuclear Spectroscopic Telescope Array (NuSTAR) X-ray space observatory, which uses two lasers to characterize the relative motion of the optics and focal plane benches, can be approximated should one laser fail. The two benches are separated by a ten-meter-long rigid mast that undergoes small amounts of thermal flexing which need to be compensated for in order to produce a non-blurred image. We analyze the trends of mast motion by archival observation parameters in order to discover whether the mast motion in future observations can be predicted. We find that, by using the solar aspect angle (SAA), observation date, and orbital phase, we can simulate the motion of one laser by translating the track produced by the other and applying modifications to the resulting mast aspect solution, allowing the reconstruction of a minimally distorted point spread function in most cases. We will implement the generation of simulated mast files alongside the usual NuSTAR data reduction pipeline for contingency purposes. This work has implications for reducing the risk of implementing laser metrology systems on future missions that use deployable masts to achieve the long focal lengths required in high-energy astronomy by mitigating the impact of a metrology laser failure in the extended phase of a mission.
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