论文标题
尼德过去的鬼魂
Ghosts of NEID's Past
论文作者
论文摘要
NIID光谱仪是R $ \ sim $ 120,000分辨率的纤维填充且高度稳定的光谱仪，用于极端径向速度（RV）精度。它正在基特国家天文台的3.5 M Wiyn望远镜进行委托，所需的仪器精度优于30 \ cms {}。 NEID的380-930 nm的带通使活动指标从蓝色的CA HK线到IR中的Ca IR三胞胎的活动指标同时波长覆盖。在本文中，我们将介绍我们在组装，集成和测试过程中表征和减轻奈德光谱仪中的光学幽灵的努力，并突出显示几个主要的光学元素贡献者，例如交叉分散棱镜和输入光学。我们将介绍2-D光谱的模拟，并讨论焦平面上预测的幽灵特征，以及它们如何影响NEID的RV性能。我们还介绍了每个幽灵采用的缓解策略，可以应用于未来的仪器设计。这项工作将使其他仪器制造商有可能避免其中一些问题以及概述缓解策略。
The NEID spectrograph is a R $\sim$ 120,000 resolution fiber-fed and highly stabilized spectrograph for extreme radial velocity (RV) precision. It is being commissioned at the 3.5 m WIYN telescope in Kitt Peak National Observatory with a desired instrumental precision of better than 30 \cms{}. NEID's bandpass of 380 -- 930 nm enables the simultaneous wavelength coverage of activity indicators from the Ca HK lines in the blue to the Ca IR triplet in the IR. In this paper we will present our efforts to characterize and mitigate optical ghosts in the NEID spectrograph during assembly, integration and testing, and highlight several of the dominant optical element contributors such as the cross dispersion prism and input optics. We shall present simulations of the 2-D spectrum and discuss the predicted ghost features on the focal plane, and how they may impact the RV performance for NEID. We also present the mitigation strategy adopted for each ghost which may be applied to future instrument designs. This work will enable other instrument builders to potentially avoid some of these issues, as well as outline mitigation strategies.
