JPL Technical Report Server

WFIRST Low Order Wavefront Sensing and Control Testbed Performance under Flight Like Photon Flux

Show simple item record

dc.contributor.author Shi, Fang
dc.contributor.author Seo, Byoung-Joon
dc.contributor.author Cady, Eric
dc.contributor.author Kern, Brian
dc.contributor.author Lam, Raymond
dc.contributor.author Marx, David
dc.contributor.author Patterson, Keith
dc.contributor.author Prada, Camilo Mejia
dc.contributor.author Shaw, John
dc.contributor.author Shelton, Chris
dc.contributor.author Shields, Joel
dc.contributor.author Tang, Hong
dc.contributor.author Truong, Tuan
dc.date.accessioned 2020-05-14T22:55:43Z
dc.date.available 2020-05-14T22:55:43Z
dc.date.issued 2018-06-12
dc.identifier.citation SPIE Astronomical Telescopes + Instrumentation, Austin, Texas, June 12 - 14, 2018 en_US
dc.identifier.clearanceno 18-3341
dc.identifier.uri http://hdl.handle.net/2014/48472
dc.description.abstract To maintain the required performance for the WFIRST Coronagraph Instrument (CGI) in a realistic space environment, a Low Order Wavefront Sensing and Control (LOWFS/C) subsystem is necessary. The WFIRST CGI LOWFS/C subsystem would use the Zernike wavefront sensor, which has the phase-shifting disk combined with the coronagraph’s focal plane mask, to sense the low-order wavefront drift and line-of-sight (LoS) error using the rejected starlight. The dynamic tests on JPL’s on the Occulting Mask Coronagraph (OMC) Testbed have demonstrated that LOWFS/C can maintain coronagraph contrast to better than 10-8 in presence of WFIRST-like line of sight and low order wavefront disturbances in both Shaped Pupil Coronagraph (SPC) and Hybrid Lyot Coronagraph (HLC) modes. However, the previous dynamic tests have been done using a bright source with photon flux equivalent to stellar magnitude of Mv = -3.5. The LOWFS/C technology development continues on the OMC testbed especially in evaluating and improving the LOWFS/C performance under the realistic photon flux that is equivalent to WFIRST Coronagraph target stars. Our recent testbed tests have demonstrated that the LOWFS/C can work cohesively with the stellar light suppression wavefront control, which brings broad band coronagraph contrast from 1x10-6 to 6x10-9, while LOWF/C is simultaneously suppressing the WFIRST like LoS and low order wavefront drift disturbances on a source that photon flux is equivalent to a Mv = 2 star. This demonstration mimics the CGI initial dark hole establish process on a bright reference star. We also demonstrated on the testbed that LOWFS/C can maintain the coronagraph contrast by suppressing the WFIRST like line-of-sight disturbances on a fainter Mv = 5 star. This mimics scenario of CGI science target observations. In this paper we will present the recent testbed results on LOWFS/C LoS loops and low order wavefront error correction loop performance on the flight like photon flux. 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, 2018 en_US
dc.subject WFIRST Coronagraph en_US
dc.subject Exoplanet en_US
dc.subject wavefront sensing and control en_US
dc.subject low order wavefront sensor en_US
dc.subject high contrast imaging en_US
dc.subject Zernike wavefront sensor en_US
dc.subject fast steering mirror en_US
dc.subject deformable mirror en_US
dc.title WFIRST Low Order Wavefront Sensing and Control Testbed Performance under Flight Like Photon Flux en_US
dc.type Preprint en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search


Browse

My Account