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首页> 外文会议>Conference on UV/Optical/IR space telescopes and instruments: Innovative technologies and concepts >James Webb Space Telescope optical simulation testbed IV: linear control alignment of the primary segmented mirror
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James Webb Space Telescope optical simulation testbed IV: linear control alignment of the primary segmented mirror

机译：詹姆斯·韦伯太空望远镜光学模拟试验台IV：主分段镜的线性控制对准

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The James Webb Space Telescope (JWST) Optical Simulation Testbed (JOST) is a tabletop experiment designed to study wavefront sensing and control for a segmented space telescope, such as JWST. With the JWST Science & Operations Center co-located at STScI, JOST was developed to provide both a platform for staff training and to test alternate wavefront sensing and control strategies for independent validation or future improvements beyond the baseline operations. The design of JOST reproduces the physics of JWST's three-mirror anastigmat (TMA) using three custom aspheric lenses. It provides similar quality image as JWST (80% Strehl ratio) over a field equivalent to a NIRCam module, but at 633 nm. An Iris AO segmented mirror stands for the segmented primary mirror of JWST. Actuators allow us to control (1) the 18 segments of the segmented mirror in piston, tip, tilt and (2) the second lens, which stands for the secondary mirror, in tip, tilt and x, y, z positions. We present the most recent experimental results for the segmented mirror alignment. Our implementation of the Wavefront sensing (WFS) algorithms using phase diversity is tested on simulation and experimentally. The wavefront control (WFC) algorithms, which rely on a linear model for optical aberrations induced by misalignment of the secondary lens and the segmented mirror, are tested and validated both on simulations and experimentally. After alignment, JOST achieves 23 nm RMS WFE at 633 nm (RMS = lambda/28), which after accounting for the difference in design wavelengths, is comparable to the budgeted post-alignment WFE expected for JWST. We present the performance of the full active optic control loop in presence of perturbations on the segmented mirror, and we detail the quality of the alignment correction.
机译：詹姆斯·韦伯太空望远镜（JWST）光学模拟测试台（JOST）是一项台式实验，旨在研究分段太空望远镜（例如JWST）的波前传感和控制。 JOST与STScI共同位于JWST科学与运营中心，旨在为员工培训提供一个平台，并测试替代的波前感测和控制策略，以进行独立验证或超出基线运营的未来改进。 JOST的设计使用了三个定制的非球面透镜，再现了JWST三反射镜（TMA）的物理原理。在等效于NIRCam模块的场上，但在633 nm处，它提供了与JWST（80％的Strehl比）相似的质量图像。 Iris AO分段镜像代表JWST的分段主镜像。致动器使我们能够控制（1）活塞中的分段镜的18个段，尖端，倾斜角;以及（2）第二透镜（代表副镜）处于尖端，倾斜角和x，y，z位置。我们提出了分段镜对准的最新实验结果。我们在仿真和实验上测试了我们使用相位分集的波前感测（WFS）算法的实现。波前控制（WFC）算法依赖于线性模型来解决由副透镜和分段镜未对准引起的光学像差，并在仿真和实验上进行了测试和验证。对准后，JOST在633 nm处获得23 nm RMS WFE（RMS = lambda / 28），在考虑了设计波长的差异之后，可与JWST预计的预算对准后WFE相媲美。我们介绍了在分段反射镜上存在扰动的情况下，完整的主动光学控制环的性能，并且我们详细介绍了对准校正的质量。

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