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Proceedings Paper

Dynamic testbed demonstration of WFIRST coronagraph low order wavefront sensing and control (LOWFS/C)
Author(s): Fang Shi; Eric Cady; Byoung-Joon Seo; Xin An; Kunjithapatham Balasubramanian; Brian Kern; Raymond Lam; David Marx; Dwight Moody; Camilo Mejia Prada; Keith Patterson; Ilya Poberezhskiy; Joel Shields; Erkin Sidick; Hong Tang; John Trauger; Tuan Truong; Victor White; Daniel Wilson; Hanying Zhou
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Paper 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.

Paper Details

Date Published: 1 September 2017
PDF: 17 pages
Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 104000D (1 September 2017); doi: 10.1117/12.2274887
Show Author Affiliations
Fang Shi, Jet Propulsion Lab. (United States)
Eric Cady, Jet Propulsion Lab. (United States)
Byoung-Joon Seo, Jet Propulsion Lab. (United States)
Xin An, Jet Propulsion Lab. (United States)
Kunjithapatham Balasubramanian, Jet Propulsion Lab. (United States)
Brian Kern, Jet Propulsion Lab. (United States)
Raymond Lam, Jet Propulsion Lab. (United States)
David Marx, Jet Propulsion Lab. (United States)
Dwight Moody, Jet Propulsion Lab. (United States)
Camilo Mejia Prada, Jet Propulsion Lab. (United States)
Keith Patterson, Jet Propulsion Lab. (United States)
Ilya Poberezhskiy, Jet Propulsion Lab. (United States)
Joel Shields, Jet Propulsion Lab. (United States)
Erkin Sidick, Jet Propulsion Lab. (United States)
Hong Tang, Jet Propulsion Lab. (United States)
John Trauger, Jet Propulsion Lab. (United States)
Tuan Truong, Jet Propulsion Lab. (United States)
Victor White, Jet Propulsion Lab. (United States)
Daniel Wilson, Jet Propulsion Lab. (United States)
Hanying Zhou, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 10400:
Techniques and Instrumentation for Detection of Exoplanets VIII
Stuart Shaklan, Editor(s)

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