Toward large-area sub-arcsecond x-ray telescopes II

• Main Authors: Heilmann, Ralf K (Contributor), Chalifoux, Brandon David (Contributor), Schattenburg, Mark Lee (Author)
• Other Authors: Massachusetts Institute of Technology. Department of Mechanical Engineering (Contributor), MIT Kavli Institute for Astrophysics and Space Research (Contributor), Schattenburg, Mark L (Contributor)
• Format: Article
• Language: English
• Published: SPIE, 2018-07-12T17:25:03Z.
• Subjects: Article
• Online Access: Get fulltext

 In order to advance significantly scientific objectives, future x-ray astronomy missions will likely call for x-ray telescopes with large aperture areas (≈3 m[superscript 2]) and fine angular resolution (≈1[superscript 2 ]). Achieving such performance is programmatically and technologically challenging due to the mass and envelope constraints of space-borne telescopes and to the need for densely nested grazing-incidence optics. Such an x-ray telescope will require precision fabrication, alignment, mounting, and assembly of large areas (≈600 m2) of lightweight (≈2 kg/m[superscript 2] areal density) high-quality mirrors, at an acceptable cost (≈1 M$/m[superscript 2] of mirror surface area). This paper reviews relevant programmatic and technological issues, as well as possible approaches for addressing these issues-including direct fabrication of monocrystalline silicon mirrors, active (in-space adjustable) figure correction of replicated mirrors, static post-fabrication correction using ion implantation, differential erosion or deposition, and coating-stress manipulation of thin substrates.