4 October 2017 Multilayer mirror-based soft x-ray polarimeter for astronomical observations
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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    cm 2 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.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Singam S. Panini, Parameswaran Sreekumar, Herman L. Marshall, Shyama Narendranath, Maheswar Nayak, P. Subramania Athiray, "Multilayer mirror-based soft x-ray polarimeter for astronomical observations," Journal of Astronomical Telescopes, Instruments, and Systems 4(1), 011002 (4 October 2017). https://doi.org/10.1117/1.JATIS.4.1.011002 . Submission: Received: 12 May 2017; Accepted: 2 August 2017
Received: 12 May 2017; Accepted: 2 August 2017; Published: 4 October 2017

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