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Proceedings Paper

A development roadmap for critical technologies needed for TALC: a deployable 20m annular space telescope
Author(s): Marc Sauvage; Jérome Amiaux; James Austin; Mara Bello; Giovanni Bianucci; Simon Chesné; Oberto Citterio; Christophe Collette; Sébastien Correia; Gilles A. Durand; Sergio Molinari; Giovanni Pareschi; Yann Penfornis; Giorgia Sironi; Giuseppe Valsecchi; Sven Verpoort; Ulrich Wittrock
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Paper Abstract

Astronomy is driven by the quest for higher sensitivity and improved angular resolution in order to detect fainter or smaller objects. The far-infrared to submillimeter domain is a unique probe of the cold and obscured Universe, harboring for instance the precious signatures of key elements such as water. Space observations are mandatory given the blocking effect of our atmosphere. However the methods we have relied on so far to develop increasingly larger telescopes are now reaching a hard limit, with the JWST illustrating this in more than one way (e.g. it will be launched by one of the most powerful rocket, it requires the largest existing facility on Earth to be qualified). With the Thinned Aperture Light Collector (TALC) project, a concept of a deployable 20 m annular telescope, we propose to break out of this deadlock by developing novel technologies for space telescopes, which are disruptive in three aspects: • An innovative deployable mirror whose topology, based on stacking rather than folding, leads to an optimum ratio of collecting area over volume, and creates a telescope with an eight times larger collecting area and three times higher angular resolution compared to JWST from the same pre-deployed volume; • An ultra-light weight segmented primary mirror, based on electrodeposited Nickel, Composite and Honeycomb stacks, built with a replica process to control costs and mitigate the industrial risks; • An active optics control layer based on piezo-electric layers incorporated into the mirror rear shell allowing control of the shape by internal stress rather than by reaction on a structure. We present in this paper the roadmap we have built to bring these three disruptive technologies to technology readiness level 3. We will achieve this goal through design and realization of representative elements: segments of mirrors for optical quality verification, active optics implemented on representative mirror stacks to characterize the shape correction capabilities, and mechanical models for validation of the deployment concept. Accompanying these developments, a strong system activity will ensure that the ultimate goal of having an integrated system can be met, especially in terms of (a) scalability toward a larger structure, and (b) verification philosophy.

Paper Details

Date Published: 29 July 2016
PDF: 8 pages
Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99041L (29 July 2016); doi: 10.1117/12.2231867
Show Author Affiliations
Marc Sauvage, CEA-Saclay (France)
Jérome Amiaux, CEA-Saclay (France)
James Austin, North Thin Ply Technology SARL (Switzerland)
Mara Bello, Media Lario Srl (Italy)
Giovanni Bianucci, Media Lario Srl (Italy)
Simon Chesné, Institut National des Sciences Appliquées de Lyon (France)
Oberto Citterio, Media Lario Srl (Italy)
Christophe Collette, Univ. Libre de Bruxelles (Belgium)
Sébastien Correia, CEA-Saclay (France)
Gilles A. Durand, CEA-Saclay (France)
Sergio Molinari, INAF - Istituto di Astrofisica e Planetologia Spaziali (Italy)
Giovanni Pareschi, INAF - Osservatorio Astronomico di Brera (Italy)
Yann Penfornis, MULTIPLAST S.A.S. (France)
Giorgia Sironi, INAF - Osservatorio Astronomico di Brera (Italy)
Giuseppe Valsecchi, Media Lario Srl (Italy)
Sven Verpoort, Muenster Univ. of Applied Sciences (Germany)
Ulrich Wittrock, Muenster Univ. of Applied Sciences (Germany)

Published in SPIE Proceedings Vol. 9904:
Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave
Howard A. MacEwen; Giovanni G. Fazio; Makenzie Lystrup; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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