1 September 2017 Dynamic testbed demonstration of WFIRST coronagraph low order wavefront sensing and control (LOWFS/C)
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Abstract
To maintain the required performance of WFIRST Coronagraph in a realistic space environment, a Low Order Wavefront Sensing and Control (LOWFS/C) subsystem is necessary. The LOWFS/C uses a Zernike wavefront sensor (ZWFS) with the phase shifting disk combined with the starlight rejecting occulting mask. For wavefront error corrections, WFIRST LOWFS/C uses a fast steering mirror (FSM) for line-of-sight (LoS) correction, a focusing mirror for focus drift correction, and one of the two deformable mirrors (DM) for other low order wavefront error (WFE) correction. As a part of technology development and demonstration for WFIRST Coronagraph, a dedicated Occulting Mask Coronagraph (OMC) testbed has been built and commissioned. With its configuration similar to the WFIRST flight coronagraph instrument the OMC testbed consists of two coronagraph modes, Shaped Pupil Coronagraph (SPC) and Hybrid Lyot Coronagraph (HLC), a low order wavefront sensor (LOWFS), and an optical telescope assembly (OTA) simulator which can generate realistic LoS drift and jitter as well as low order wavefront error that would be induced by the WFIRST telescope’s vibration and thermal changes. In this paper, we will introduce the concept of WFIRST LOWFS/C, describe the OMC testbed, and present the testbed results of LOWFS sensor performance. We will also present our recent results from the dynamic coronagraph tests in which we have demonstrated of using LOWFS/C to maintain the coronagraph contrast with the presence of WFIRST-like line-of-sight and low order wavefront disturbances.
Conference Presentation
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Fang Shi, Fang Shi, Eric Cady, Eric Cady, Byoung-Joon Seo, Byoung-Joon Seo, Xin An, Xin An, Kunjithapatham Balasubramanian, Kunjithapatham Balasubramanian, Brian Kern, Brian Kern, Raymond Lam, Raymond Lam, David Marx, David Marx, Dwight Moody, Dwight Moody, Camilo Mejia Prada, Camilo Mejia Prada, Keith Patterson, Keith Patterson, Ilya Poberezhskiy, Ilya Poberezhskiy, Joel Shields, Joel Shields, Erkin Sidick, Erkin Sidick, Hong Tang, Hong Tang, John Trauger, John Trauger, Tuan Truong, Tuan Truong, Victor White, Victor White, Daniel Wilson, Daniel Wilson, Hanying Zhou, Hanying Zhou, } "Dynamic testbed demonstration of WFIRST coronagraph low order wavefront sensing and control (LOWFS/C)", Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 104000D (1 September 2017); doi: 10.1117/12.2274887; https://doi.org/10.1117/12.2274887
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