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 language | English (US) |
---|---|
Pages (from-to) | 91-95 |
Number of pages | 5 |
Journal | Journal of Optics (India) |
Volume | 47 |
Issue number | 1 |
DOIs | |
State | Published - Mar 1 2018 |
Bibliographical note
Publisher Copyright:© 2017, The Optical Society of India.
Keywords
- Bragg reflection
- Multilayer mirrors
- X-ray optics