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Proceedings Paper • Open Access

Large aperture telescope technology: a design for an active lightweight multi-segmented fold-out space mirror
Author(s): S. J. Thompson; A. P. Doel; M. Whalley; R. Edeson; R. Edeson; I. Tosh; O. Poyntz-Wright; E. Atad-Ettedgui; D. Montgomery; J. Nawasra

Paper Abstract

Large aperture telescope technology (LATT) is a design study for a differential lidar (DIAL) system; the main investigation being into suitable methods, technologies and materials for a 4-metre diameter active mirror that can be stowed to fit into a typical launch vehicle (e.g. ROKOT launcher with ∼ 2.1-metre diameter cargo) and can self-deploy – in terms of both leaving the space vehicle and that the mirrors unfold and self-align to the correct optical form within the tolerances specified. The primary mirror requirements are: main wavelength of 935.5 nm, RMS corrected wavefront error of λ/6, optical surface roughness better than 5 nm, areal density of less than 16 kg/m2 and 1-2 mirror shape corrections per orbit. The primary mirror consists of 7 segments - a central hexagonal mirror and 6 square mirror petals which unfold to form the 4-meter diameter aperture. The focus of the UK LATT consortium for this European Space Agency (ESA) funded project is on using lightweighted aluminium or carbon-fibre-composite materials for the mirror substrate in preference to more traditional materials such as glass and ceramics; these materials have a high strength and stiffness to weight ratio, significantly reducing risk of damage due to launch forces and subsequent deployment in orbit.

We present an overview of the design, which includes suitable actuators for wavefront correction, petal deployment mechanisms and lightweight mirror technologies. Preliminary testing results from manufactured lightweight mirror samples will also be summarised.

Paper Details

Date Published: 20 November 2017
PDF: 7 pages
Proc. SPIE 10565, International Conference on Space Optics — ICSO 2010, 105651Y (20 November 2017); doi: 10.1117/12.2309210
Show Author Affiliations
S. J. Thompson, Univ. College London (United Kingdom)
A. P. Doel, Univ. College London (United Kingdom)
M. Whalley, Rutherford Appleton Lab. (United Kingdom)
R. Edeson, Rutherford Appleton Lab. (United Kingdom)
R. Edeson, Rutherford Appleton Lab. (United Kingdom)
I. Tosh, Rutherford Appleton Lab. (United Kingdom)
O. Poyntz-Wright, Rutherford Appleton Lab. (United Kingdom)
E. Atad-Ettedgui, UK Astronomy Technology Ctr. (United Kingdom)
D. Montgomery, UK Astronomy Technology Ctr. (United Kingdom)
J. Nawasra, ABSL Space Products (United Kingdom)

Published in SPIE Proceedings Vol. 10565:
International Conference on Space Optics — ICSO 2010
Errico Armandillo; Bruno Cugny; Nikos Karafolas, Editor(s)

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