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 output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

X-ray reflectivity of single layer coated X-ray mirror is confined to small grazing angles (OpenSPiltSPi 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 (OpenSPiltSPi10keV). 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/ B4C 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/ B4C multilayer mirror from 9 to 16 keV is presented with a discussion on applications of multilayer mirrors in high energy astronomy.

Original languageEnglish (US)
Pages (from-to)91-95
Number of pages5
JournalJournal of Optics (India)
Volume47
Issue number1
DOIs
StatePublished - Mar 1 2018

Keywords

  • Bragg reflection
  • Multilayer mirrors
  • X-ray optics

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