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

doi:10.1007/s12596-017-0444-8

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

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

8 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 language	English (US)
Pages (from-to)	91-95
Number of pages	5
Journal	Journal of Optics (India)
Volume	47
Issue number	1
DOIs	https://doi.org/10.1007/s12596-017-0444-8
State	Published - Mar 1 2018

Bibliographical note

Publisher Copyright:
© 2017, The Optical Society of India.

Keywords

Bragg reflection
Multilayer mirrors
X-ray optics

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title = "Development of multilayer mirrors for space-based astronomical X-ray optics",

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.",

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doi = "10.1007/s12596-017-0444-8",

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AU - Panini, Singam S.

AU - Nayak, M.

AU - Shyama Narendranath, K. C.

AU - Pradhan, P. C.

AU - Athiray, P. S.

AU - Sreekumar, P.

AU - Lodha, G. S.

AU - Tiwari, M. K.

PY - 2018/3/1

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N2 - 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.

AB - 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.

KW - Bragg reflection

KW - Multilayer mirrors

KW - X-ray optics

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

Abstract

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Keywords

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