@inproceedings{fdd94aee96fc4095baee3719f3730132,
title = "APERTURE, a precise extremely-large reflective telescope using re-configurable element: A progress report",
abstract = "One of the pressing needs for the UV-Vis is an affordable design that allows larger mirrors than the JWST primary. In this publication we report the results of the first year of a NASA Innovative Advanced Concepts Phase II study. Our project is called A Precise Extremely large Reflective Telescope Using Reconfigurable Elements (APERTURE). The concept is to deploy a continuous membrane-like mirror. The mirror figure will be corrected after deployment, causing the figure error to decrease below λ/20. While the basic concept is not new, our innovation lies in a different approach to correcting the residual figure errors from the classical piezoelectricpatch technology. Instead, our concept is based on a contiguous coating of a magnetic smart material (MSM). After deployment, a magnetic write head will move along the non-reflecting side of the mirror. The magnetic field will produce a stress in the MSM which then corrects the mirror shape. This publication summarizes the results of minimizing the MSM deposition stress as well as the size and stability of the deformation, which is maintained by a magnetically hard material.",
keywords = "Deformable, Deployable, Magnetic Smart Materials, Magnetostriction, Membrane, Space Mirrors",
author = "R. Coppejans and Ulmer, {M. P.} and Buchholz, {D. B.} and X. Wang and J. Cao and Coverstone, {V. L.} and Baturalp, {T. B.} and Condron, {K. S.} and O'Donnell, {A. E.} and Harpt, {B. E.} and Reinhardt, {W. H.} and Johnson, {M. E.}",
note = "Funding Information: This work was supported primarily by NASA NIAC grant number NNX15AL89G as well as synergistic work for adaptive X-ray optics supported NASA (Grant NNX16AL31G). The authors would like to thank Dr. Lahsen Assoufid at Argonne National Laboratory for providing silicon substrate samples. The authors would also like to thank David Pappas, Dr. Marco Quadrelli, Dr. Peter Takacs, Dr. Ron Shiri, Drs. Steve Arnold and Drs. William W. Zhang for advice and support. We thank Giovanni Pareschi for suggesting working with MSM films in the first place. We also thank the ISEN center at Northwestern University for providing funds for purchasing additional sputtering guns that were used for a portion of the coating work done here. This work made use of the EPIC facility of Northwestern Universitys NUANCE Center, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205); the MRSEC program (NSF DMR-1121262) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN. We thank Yip-Wah Chung for advice on coating, materials, and magnetics. BH was supported by an Illinois Space Grant summer research scholarship and AO was supported part both by an Illinois Space Grant summer research scholarship and a Northwestern University Undergraduate Research grant. Publisher Copyright: {\textcopyright} COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.; UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VIII 2017 ; Conference date: 06-08-2017 Through 07-08-2017",
year = "2017",
doi = "10.1117/12.2274278",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "MacEwen, {Howard A.} and Breckinridge, {James B.} and Breckinridge, {James B.}",
booktitle = "UV/Optical/IR Space Telescopes and Instruments",
}