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Journal of Optics

, Volume 47, Issue 1, pp 91–95 | Cite as

Development of multilayer mirrors for space-based astronomical X-ray optics

  • Singam S. Panini
  • M. Nayak
  • K. C. Shyama Narendranath
  • P. C. Pradhan
  • P. S. Athiray
  • P. Sreekumar
  • G. S. Lodha
  • M. K. Tiwari
Research Article

Abstract

X-ray reflectivity of single layer coated X-ray mirror is confined to small grazing angles (< 1°) grazing incidence X-ray telescopes usually are bulky and have large focal lengths in trade of effective area which is expensive for a space based telescope. Critical angle for total external reflection of a mirror varies inversely with the energy of the incident photon. This practically limits the possibility of making an X-ray telescope sensitive to higher energy X-rays \(( < 10 \,{\text{keV}}\)). Use of multilayer mirrors makes it possible to operate the instrument at higher angles and also significantly improves the high energy sensitivity (80 keV). Fabricated \(W /B_{4} C\) multilayer mirror provides a peak reflectivity of 19% at first Bragg peak (2.3°) when tested with 8.047 keV X-rays. Multi-wavelength reflectivity analysis of \(W /B_{4} C\) multilayer mirror from 9 to 16 keV is presented with a discussion on applications of multilayer mirrors in high energy astronomy.

Keywords

Multilayer mirrors X-ray optics Bragg reflection 

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Copyright information

© The Optical Society of India 2017

Authors and Affiliations

  • Singam S. Panini
    • 1
    • 5
  • M. Nayak
    • 2
  • K. C. Shyama Narendranath
    • 3
  • P. C. Pradhan
    • 2
  • P. S. Athiray
    • 4
  • P. Sreekumar
    • 1
  • G. S. Lodha
    • 2
  • M. K. Tiwari
    • 2
  1. 1.Indian Institute of Astrophysics, BangaloreBangaloreIndia
  2. 2.Raja Ramanna Centre for Advanced TechnologyIndoreIndia
  3. 3.Indian Space Research OrganizationBangaloreIndia
  4. 4.Manipal Centre for Natural SciencesManipalIndia
  5. 5.University of CalcuttaKolkataIndia

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