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首页> 外文会议>Conference on space telescopes and instrumentation >Closing the Contrast Gap between Testbed and Model Prediction with WFIRST-CGI Shaped Pupil Coronagraph
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Closing the Contrast Gap between Testbed and Model Prediction with WFIRST-CGI Shaped Pupil Coronagraph

机译：使用WFIRST-CGI型小学生日冕仪缩小测试平台与模型预测之间的对比差距

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JPL has recently passed an important milestone in its technology development for a proposed NASA WFIRST mission coronagraph: demonstration of better than 1×10~(-8) contrast over broad bandwidth (10%) on both shaped pupil coronagraph (SPC) and hybrid Lyot coronagraph (HLC) testbeds with the WFIRST obscuration pattern. Challenges remain, however, in the technology readiness for the proposed mission. One is the discrepancies between the achieved contrasts on the testbeds and their corresponding model predictions. A series of testbed diagnoses and modeling activities were planned and carried out on the SPC testbed in order to close the gap. A very useful tool we developed was a derived "measured" testbed wavefront control Jacobian matrix that could be compared with the model-predicted "control" version that was used to generate the high contrast dark hole region in the image plane. The difference between these two is an estimate of the error in the control Jacobian. When the control matrix, which includes both amplitude and phase, was modified to reproduce the error, the simulated performance closely matched the SPC testbed behavior in both contrast floor and contrast convergence speed. This is a step closer toward model validation for high contrast coronagraphs. Further Jacobian analysis and modeling provided clues to the possible sources for the mismatch: DM misregistration and testbed optical wavefront error (WFE) and the deformable mirror (DM) setting for correcting this WFE. These analyses suggested that a high contrast coronagraph has a tight tolerance in the accuracy of its control Jacobian. Modifications to both testbed control model as well as prediction model are being implemented, and future works are discussed.
机译：JPL最近通过了一项拟议的NASA WFIRST任务日冕仪技术发展的重要里程碑：在异型瞳孔日冕仪（SPC）和混合Lyot上，在宽带宽（10％）上展示了优于1×10〜（-8）的对比度带有WFIRST遮蔽模式的日冕仪（HLC）测试台。但是，在准备拟议任务的技术准备方面仍然存在挑战。一是在测试台上获得的对比度与其相应的模型预测之间的差异。为了缩小差距，在SPC测试床上计划并进行了一系列测试和诊断活动。我们开发的一个非常有用的工具是派生的“测量”测试台波前控制雅可比矩阵，可以与模型预测的“控制”版本进行比较，该模型用于在图像平面中生成高对比度暗孔区域。两者之间的差异是对控制雅可比行列式中误差的估计。当修改包括幅度和相位的控制矩阵以重现误差时，在对比底和对比收敛速度上，模拟性能都与SPC测试平台的行为紧密匹配。这是朝着高对比度日冕仪模型验证迈出的一步。进一步的雅可比分析和建模为不匹配的可能根源提供了线索：DM失配和测试台光学波前误差（WFE）以及用于校正该WFE的可变形镜（DM）设置。这些分析表明，高对比度日冕仪在其控制雅可比行列式的准确性上具有严格的公差。正在对试验台控制模型和预测模型进行修改，并讨论了未来的工作。

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