Multilayer mirror-based soft X-ray polarimeter for astronomical observations

Singam S. Panini, Parameswaran Sreekumar, Herman L. Marshall, Shyama Narendranath, Maheswar Nayak, P. Subramania Athiray

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3 Scopus citations

Abstract

A simple design of a soft X-ray polarimeter using multilayer mirrors is presented. A multilayer mirror acts as a linear polarization analyzer for X-rays at incidence angles close to the Brewster angle. The instrument consists of an X-ray concentrator, a set of multilayer mirrors placed at 45 deg from the optical axis, and a detector at Nasmyth focus. The instrument rotating about its optical axis during observations can measure the linear polarization of 0.2-to 0.7-keV X-rays from astronomical sources. The use of a soft X-ray concentrator with geometrical area ∼630 cm2 provides sufficient sensitivity to address key scientific questions. Five different multilayer mirrors placed on a rotating wheel provide the option to measure polarization in any of the five narrow bands spanning the 0.2-to 0.7-keV range. Design and estimated performance of the design are discussed.

Original languageEnglish (US)
Article number011002
JournalJournal of Astronomical Telescopes, Instruments, and Systems
Volume4
Issue number1
DOIs
StatePublished - Jan 1 2018

Keywords

  • Multilayer mirrors
  • polarimeter
  • soft X-rays

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