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High-contrast imager for complex aperture telescopes (HiCAT): 5. first results with segmented-aperture coronagraph and wavefront control

Soummer, Rémi and Brady, Gregory R. and Brooks, Keira and Comeau, Thomas and Choquet, Élodie and Dillon, Tom and Egron, Sylvain and Gontrum, Rob and Hagopian, John and Laginja, Iva and Leboulleux, Lucie and Perrin, Marshall D. and Petrone, Peter and Pueyo, Laurent and Mazoyer, Johan and N'Diaye, Mamadou and Eldorado Riggs, A. J. and Shiri, Ron and Sivaramakrishnan, Anand and St. Laurent, Kathryn and Valenzuela, Ana-Maria and Zimmerman, Neil T. (2018) High-contrast imager for complex aperture telescopes (HiCAT): 5. first results with segmented-aperture coronagraph and wavefront control. In: Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave. Proceedings of SPIE. No.10698. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 106981O. ISBN 9781510619494. http://resolver.caltech.edu/CaltechAUTHORS:20181207-083715786

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Abstract

Segmented telescopes are a possible approach to enable large-aperture space telescopes for the direct imaging and spectroscopy of habitable worlds. However, the increased complexity of their aperture geometry, due to the central obstruction, support structures and segment gaps, makes high-contrast imaging very challenging. The High-contrast imager for Complex Aperture Telescopes (HiCAT) testbed was designed to study and develop solutions for such telescope pupils using wavefront control and coronagraphic starlight suppression. The testbed design has the flexibility to enable studies with increasing complexity for telescope aperture geometries starting with off-axis telescopes, then on-axis telescopes with central obstruction and support structures - e.g. the Wide Field Infrared Survey Telescope (WFIRST) - up to on-axis segmented telescopes, including various concepts for a Large UV, Optical, IR telescope (LUVOIR). In the past year, HiCAT has made significant hardware and software updates in order to accelerate the development of the project. In addition to completely overhauling the software that runs the testbed, we have completed several hardware upgrades, including the second and third deformable mirror, and the first custom Apodized Pupil Lyot Coronagraph (APLC) optimized for the HiCAT aperture, which is similar to one of the possible geometries considered for LUVOIR. The testbed also includes several external metrology features for rapid replacement of parts, and in particular the ability to test multiple apodizers readily, an active tip-tilt control system to compensate for local vibration and air turbulence in the enclosure. On the software and operations side, the software infrastructure enables 24/7 automated experiments that include routine calibration tasks and high-contrast experiments. In this communication we present an overview and status update of the project, both on the hardware and software side, and describe the results obtained with APLC wavefront control.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2314110DOIArticle
ORCID:
AuthorORCID
Soummer, Rémi0000-0003-2753-2819
Choquet, Élodie0000-0002-9173-0740
Perrin, Marshall D.0000-0002-3191-8151
Pueyo, Laurent0000-0003-3818-408X
Mazoyer, Johan0000-0002-9133-3091
Zimmerman, Neil T.0000-0001-5484-1516
Additional Information:© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE). This work was supported in part by the National Aeronautics and Space Administration under Grants NNX12AG05G and NNX14AD33G issued through the Astrophysics Research and Analysis (APRA) program (PI: R. Soummer) and by Jet Propulsion Laboratory subcontract No.1539872 (Segmented-Aperture Coronagraph Design and Analysis; PI: R. Soummer), and the STScI Director’s Discretionary Research Funds. It is also partly funded by the French national aerospace research center ONERA (Office National dEtudes et Recherches Arospatiales) and by the Laboratoire d’Astrophysique de Marseille (LAM). We are also thankful to Lee Feinberg and GSFC for lending us theodolites and a coordinate measurement Faro arm, and thankful to Stuart Shaklan from JPL for loaning us a WFIRST-CGI apodizer, which helped us accelerate the development of our software and hardware infrastructure.
Funders:
Funding AgencyGrant Number
NASANNX12AG05G
NASANNX14AD33G
JPL1539872
Space Telescope Science InstituteUNSPECIFIED
Office National d'Etudes et de Recherches Aérospatiales (ONERA)UNSPECIFIED
Laboratoire d’Astrophysique de Marseille (LAM)UNSPECIFIED
Subject Keywords:Segmented telescopes, coronagraphy, exoplanet, high-contrast imaging, coronagraphy testbed, Apodized Pupil Lyot Coronagraph, APLC
Record Number:CaltechAUTHORS:20181207-083715786
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181207-083715786
Official Citation:Rémi Soummer, Gregory R. Brady, Keira Brooks, Thomas Comeau, Élodie Choquet, Tom Dillon, Sylvain Egron, Rob Gontrum, John Hagopian, Iva Laginja, Lucie Leboulleux, Marshall D. Perrin, Peter Petrone, Laurent Pueyo, Johan Mazoyer, Mamadou N'Diaye, A. J. Eldorado Riggs, Ron Shiri, Anand Sivaramakrishnan, Kathryn St. Laurent, Ana-Maria Valenzuela, Neil T. Zimmerman, "High-contrast imager for complex aperture telescopes (HiCAT): 5. first results with segmented-aperture coronagraph and wavefront control," Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106981O (21 August 2018); doi: 10.1117/12.2314110
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91549
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:07 Dec 2018 22:35
Last Modified:26 Mar 2019 17:12

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