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Proceedings Paper

X-ray telescope mirror mounting and deformation reduction using ThermoYield actuators and mirror geometry changes
Author(s): Michael D. DeTienne; Alexander R. Bruccoleri; Anjelica Molnar-Fenton; Brandon Chalifoux; Ralf K. Heilmann; Youwei Yao; Mark L. Schattenburg
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Paper Abstract

Recently, the X-ray optics community has been developing technology for high angular resolution, large collecting area X-ray telescopes such as the Lynx mission concept. To meet the high collecting area requirements of such telescope concepts, research is being conducted on thin, segmented optics. The precision mounting posts that fixture and align segmented optics must be the correct length to sub-micron accuracy to satisfy the angular resolution goals of such a concept. Mirror distortion caused by adhesive shrinkage at mount points on the mirror surface also needs to be controlled to micron-radian tolerances. We report on two solutions to these problems. Set-and-forget adjustable length optical mounting posts have been developed to control mirror spacer length. The actuator consists of a metal cylinder with a cylindrical neck cut halfway along the length. To change the length of this actuator, an axial force is applied and the neck is momentarily heated to the plastic deformation temperature via resistive heating. All of the plastic deformation that occurs becomes permanent after cooling. Both compression and expansion of these actuators has been demonstrated in steps ranging from 6 nm to several microns. This paper will describe an experimental setup, show, and discuss data. Additionally, a stress relief technique to reduce mirror distortion caused by shrinkage of the adhesive bond to the actuator is proposed and demonstrated by modelling.

Paper Details

Date Published: 6 July 2018
PDF: 15 pages
Proc. SPIE 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray, 1069943 (6 July 2018); doi: 10.1117/12.2314896
Show Author Affiliations
Michael D. DeTienne, Izentis LLC (United States)
MIT Space Nanotechnology Lab. (United States)
Alexander R. Bruccoleri, Izentis LLC (United States)
Anjelica Molnar-Fenton, Izentis LLC (United States)
Brandon Chalifoux, MIT Space Nanotechnology Lab. (United States)
Ralf K. Heilmann, MIT Space Nanotechnology Lab. (United States)
Youwei Yao, MIT Space Nanotechnology Lab. (United States)
Mark L. Schattenburg, MIT Space Nanotechnology Lab. (United States)


Published in SPIE Proceedings Vol. 10699:
Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray
Jan-Willem A. den Herder; Shouleh Nikzad; Kazuhiro Nakazawa, Editor(s)

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