Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/8297
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dc.contributor.authorPanini, S. S-
dc.contributor.authorNayak, M-
dc.contributor.authorGupta, Rajkumar-
dc.contributor.authorPradhan, Paresh C.-
dc.contributor.authorMajhi, Arindam-
dc.contributor.authorNarendranath, S-
dc.contributor.authorSreekumar, P-
dc.date.accessioned2023-11-29T06:29:06Z-
dc.date.available2023-11-29T06:29:06Z-
dc.date.issued2018-10-
dc.identifier.citationJournal of Astronomical Telescopes, Instruments, and Systems, Vol. 4, No. 4, 044003en_US
dc.identifier.issn2329-4221-
dc.identifier.urihttp://hdl.handle.net/2248/8297-
dc.descriptionRestricted Accessen_US
dc.description.abstractW  /  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.en_US
dc.language.isoenen_US
dc.publisherSPIE-Society of Photo-Optical Instrumentation Engineersen_US
dc.relation.urihttps://doi.org/10.1117/1.JATIS.4.4.044003-
dc.rights© Society of Photo-Optical Instrumentation Engineers-
dc.subjectMultilayer mirrorsen_US
dc.subjectX-ray opticsen_US
dc.titleThermal and temporal stability of W / B4C multilayer mirrors for space-based astronomical applicationsen_US
dc.typeArticleen_US
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