X-ray telescope mirror mounting and deformation reduction using ThermoYield actuators and mirror geometry changes

Michael D. Detienne, Alexander R. Bruccoleri, Anjelica Molnar-Fenton, Brandon Chalifoux, Ralf K. Heilmann, Youwei Yao, Mark L. Schattenburg

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


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.

Original languageEnglish (US)
Title of host publicationSpace Telescopes and Instrumentation 2018
Subtitle of host publicationUltraviolet to Gamma Ray
EditorsShouleh Nikzad, Jan-Willem A. Den Herder, Kazuhiro Nakazawa
ISBN (Print)9781510619517
StatePublished - 2018
Externally publishedYes
EventSpace Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray - Austin, United States
Duration: Jun 10 2018Jun 15 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherSpace Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray
Country/TerritoryUnited States


  • Adjustable
  • X-ray mirror
  • X-ray telescope
  • optical mount
  • segmented optics
  • set-and-forget
  • stress localization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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