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Diffract ion-based analysis of tunnel size for a scaled external occulter testbed

机译：基于扩展离子的隐秘隐身试验台的隧道尺寸分析

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For performance verification of an external occulter mask (also called a starshade), scaled test beds have been developed to measure the suppression of the occulter shadow in the pupil plane and contrast in the image plane. For occulter experiments the scaling is typically performed by maintaining an equivalent Fresnel number. The original Princeton occulter testbed was oversized with respect to both input beam and shadow propagation to limit any diffraction effects due to finite testbed enclosure edges; however, to operate at realistic space-mission equivalent Fresnel numbers an extended testbed is currently under construction. With the longer propagation distances involved, diffraction effects due to the edge of the tunnel must now be considered in the experiment design. Here, we present a diffraction-based model of two separate tunnel effects. First, we consider the effect of tunnel-edge induced diffraction ringing upstream from the occulter mask. Second, we consider the diffraction effect due to clipping of the output shadow by the tunnel downstream from the occulter mask. These calculations are performed for a representative point design relevant to the new Princeton occulter experiment, but we also present an analytical relation that can be used for other propagation distances.
机译：为了验证外部掩星遮罩（也称为星状阴影）的性能，已开发了比例测试台，以测量对瞳孔平面中掩星阴影和图像平面中对比度的抑制程度。对于隐匿者实验，缩放通常是通过保持等效的菲涅耳数来执行的。原始的普林斯顿隐匿者测试台在输入光束和阴影传播方面都过大，以限制由于有限的测试台围护边缘而引起的任何衍射效应。但是，为了在与实际空间发射等效的菲涅耳数下运行，目前正在建造扩展的试验台。随着传播距离的增加，现在必须在实验设计中考虑由于隧道边缘引起的衍射效应。在这里，我们提出了两个单独的隧道效应的基于衍射的模型。首先，我们考虑了掩星掩膜上游隧道边缘引起的衍射振铃的影响。其次，我们考虑了由于隐影遮蔽物下游的隧道对输出阴影的削波所造成的衍射效应。这些计算是针对与新普林斯顿掩星实验相关的代表性点设计而进行的，但我们还提供了可用于其他传播距离的解析关系。

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