Thermal and temporal stability of W/B4C multilayer mirrors for space-based astronomical applications

Panini S. Singam; Maheswer Nayak; Rajkumar Gupta; Paresh C. Pradhan; Arindam Majhi; Shyama Narendranath; Parameswaran Sreekumar

doi:10.1117/1.JATIS.4.4.044003

5 November 2018 Thermal and temporal stability of W/B₄C multilayer mirrors for space-based astronomical applications

Panini S. Singam, Maheswer Nayak, Rajkumar Gupta, Paresh C. Pradhan, Arindam Majhi, Shyama Narendranath, Parameswaran Sreekumar

Author Affiliations +

Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 4, Issue 4, 044003 (November 2018). https://doi.org/10.1117/1.JATIS.4.4.044003

Abstract

W / B₄C multilayer (ML) mirrors with varying periodicities ( d ) = 1.6 to 5.4 nm are tested for rapid thermal and temporal stability, which are required for space-based x-ray telescopes for astronomy. The aging effects on the structural parameters over a period of 2 years are assessed through hard x-ray reflectivity (HXR) measurements. Multiwavelength performance of ML mirrors is studied over thermal cycling from −40 ° C to +50 ° C for 1, 3, and 10 days, which simulate the expected temperature variation in the low-earth orbit. The structural parameters of all samples remained nearly constant over the first 2 years. It is observed that the short-period MLs develop a contamination layer over time. Rapid thermal cycling results indicate no change in HXR for all ML mirrors. However, at soft x-rays, there is a reduction in reflectivity after thermal cycling. The variations in optical performance at hard and soft x-ray energies after thermal cycling are due to variation in interface roughness at different spatial frequencies.

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Panini S. Singam, Maheswer Nayak, Rajkumar Gupta, Paresh C. Pradhan, Arindam Majhi, Shyama Narendranath, and Parameswaran Sreekumar "Thermal and temporal stability of W/B₄C multilayer mirrors for space-based astronomical applications," Journal of Astronomical Telescopes, Instruments, and Systems 4(4), 044003 (5 November 2018). https://doi.org/10.1117/1.JATIS.4.4.044003

Received: 30 May 2018; Accepted: 15 October 2018; Published: 5 November 2018

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