JPL Technical Report Server

Low order wavefront sensing and control for WFIRST coronagraph

Show simple item record Shi, Fang Balasubramanian, Kunjithapatham Bartos, Randall Hein, Randall Lam, Raymond Moore, Douglas Moore, James Patterson, Keith Poberezhskiy, Ilya Shields, Joel Sidick, Erkin Tang, Hong Truong, Tuan Wallace, Kent Wang, Xu Wilson, Dan 2019-03-29T17:37:48Z 2019-03-29T17:37:48Z 2016-06-26
dc.identifier.citation SPIE Astronomical Telescopes + Instrumentation 2016, Edinburgh, Scotland, June 26 - July 1, 2016 en_US
dc.identifier.clearanceno 16-3033
dc.description.abstract To maintain the required WFIRST Coronagraph starlight suppression performance in a realistic space environment, a low order wavefront sensing and control (LOWFS/C) subsystem is necessary. The LOWFS/C uses the rejected stellar light from coronagraph to sense and suppress the telescope pointing drift and jitter as well as the low order wavefront errors due to changes in thermal loading on the telescope and the rest of the observatory. In this paper we will present an overview of the low order wavefront sensing and control subsystem for the WFIRST Coronagraph and describe the WFIRST Coronagraph LOWFS function, its design, and modeled performance. We will present experimental results on a dedicated LOWFS/C testbed that show that the LOWFS/C subsystem not only can sense pointing errors better than 0.2 mas but has also experimentally demonstrated closed loop pointing error suppression with residuals better than 0.4 mas rms per axis for the vast majority of observatory reaction wheel speeds. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA: Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2016 en_US
dc.subject Exoplanet en_US
dc.subject wavefront sensing and control en_US
dc.subject stellar coronagraph en_US
dc.subject WFIRST en_US
dc.title Low order wavefront sensing and control for WFIRST coronagraph en_US
dc.type Presentation en_US

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