In-band and out-of-band reflectance calibrations of the EUV multilayer mirrors of the atmospheric imaging assembly instrument aboard the Solar Dynamics Observatory

Soufli, Régina; Spiller, Eberhard; Windt, David L.; Robinson, Jeffrey A.; Gullikson, Eric M.; Marcos, Luis Rodríguez-de; Fernández-Perea, Mónica; Baker, Sherry L.; Aquila, Andrew; Dollar, F.; Méndez, José A.; Larruquert, Juan I.; Golub, L.; Boerner, P.

doi:10.1117/12.927274

Cited by 14 publications

(12 citation statements)

References 10 publications

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“…Moreover, this approach requires the use of a hardware mask placed on top of the mirror during multilayer deposition, which involves additional complexities and risks due to the proximity of the mask to the area being coated. "Shadowing" effects between the edges of the mask and the sector being coated diminish the multilayer performance and reduce the overall effective area of the mirror [14][15][16]. Multiple telescopes often need to be employed in a given mission in order to achieve the number of EUV channels required to accomplish the science objectives [13].…”

Section: Introductionmentioning

confidence: 99%

Triple-wavelength, narrowband Mg/SiC multilayers with corrosion barriers and high peak reflectance in the 25-80 nm wavelength region

Fernández-Perea¹,

Soufli²,

Robinson³

et al. 2012

Opt. Express

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Abstract:We have developed new, Mg/SiC multilayer coatings with corrosion barriers which can be used to efficiently and simultaneously reflect extreme ultraviolet (EUV) radiation in single or multiple narrow bands centered at wavelengths in the spectral region from 25 to 80 nm. Corrosion mitigation was attempted through the use of Al-Mg or Al thin layers. Three different multilayer design concepts were developed and deposited by magnetron sputtering and the reflectance was measured at near-normal incidence in a broad spectral range. Standard Mg/SiC multilayers were also deposited and measured for comparison. They were shown to efficiently reflect radiation at a wavelength of 76.9 nm with a peak reflectance of 40.6% at near-normal incidence, the highest experimental reflectance reported at this wavelength for a narrowband coating. The demonstration of multilayer coatings with corrosion resistance and multiple-wavelength EUV performance is of great interest in the development of mirrors for space-borne solar physics telescopes and other applications requiring long-lasting coatings with narrowband response in multiple emission lines across the EUV range.

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Section: Introductionmentioning

confidence: 99%

Triple-wavelength, narrowband Mg/SiC multilayers with corrosion barriers and high peak reflectance in the 25-80 nm wavelength region

Fernández-Perea¹,

Soufli²,

Robinson³

et al. 2012

Opt. Express

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“…The bilayer materials used for all SUVI EUV coatings except the one for 93.9 Å, were Molybdenum-Silicon (Mo/Si), the 93.9 Å coating was fabricated using Molybdenum-Yttrium (Mo/Y). The development of the SUVI coatings was partially based on earlier work done for the AIA multilayer mirrors, 23,24 however, SUVI is the first EUV solar telescope fabricated with six different multilayer coatings on a single optic. PSD calculations are compared to the SUVI-required PSD.…”

Section: Multilayer Coatingmentioning

confidence: 99%

Multisegmented, multilayer-coated mirrors for the Solar Ultraviolet Imager

et al. 2013

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Abstract. The Solar Ultraviolet Imager (SUVI) is one of the several instruments that will fly on board the next generation of Geostationary Operational Environmental Satellites R-U platforms, as part of the National Oceanic and Atmospheric Administration's space weather monitoring fleet. SUVI is a generalized Cassegrain telescope that employs multilayer-coated optics that operate in six extreme ultraviolet (EUV) narrow bandpasses centered at 93.9, 131.2, 171.1, 195.1, 284.2 and 303.8 Å. The innovation of the design is that SUVI is the first EUV solar telescope that has six different wavelength channels accommodated on each mirror. And despite having six segmented multilayer-coatings, shadowing (due to the mask) is minimized allowing SUVI to exceed its effective area specifications. Once operational, SUVI will record full-disk, spectroheliograms every few minutes, where this data will be used to better understand the effects of solar produced EUV radiation on Earth and the near-Earth environment. The material presented discusses general aspects of the SUVI optical design, mirror fabrication, super polishing, and metrology carried out to verify optical surface quality and in-band, EUV reflectivity performance of the multilayer coatings. The power spectral density and EUV measurements are shown to exceed performance requirements and are critical for the overall calibration and monitoring of SUVI's throughput and imaging performance, once operational.

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“…A few months after deposition, corroded areas developed on the Mg/SiC-coated flight mirrors planned for SDO, thus preventing their use. Substitute flight mirrors coated with SiC/Si (instead of Mg/SiC) multilayers were ultimately installed aboard SDO 5,6,7 , with dramatically decreased the throughput (by a factor of 10) of the 2-mirror imaging telescopes at 30.4 and 33.5 nm, and increased thin film stress across the optical surface of each mirror. More recently, Mg/SiC could have been the most suitable multilayer coating for the Fe XV (28.4 nm) and He II (30.4 nm) channels of the EUV imaging telescopes aboard the Geostationary Operational Environmental Satellite (GOES)-R 8 , the suite of space weather satellites operated by NASA and NOAA.…”

Section: Introductionmentioning

confidence: 99%

“…For example, an existing practice towards the imaging of multiple wavelengths from a single telescope is to divide each telescope mirror in multiple sectors, with each sector tuned to one specific wavelength and coated separately using the appropriate material pair. This approach requires the development of several different multilayer coatings and the use of a hardware mask placed on top of the mirror during multilayer deposition, which involves additional complexities and risks 4,5,6,7,8 . The instrument throughput corresponding to each wavelength is also decreased accordingly.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion-resistant high-reflectance Mg/SiC multilayer coatings for solar physics in the 25-80 nm wavelength region

et al. 2012

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The corrosion mechanisms in Mg/SiC multilayers have been elucidated and corrosion-resistant Mg/SiC multilayer coatings have been demonstrated using spontaneously intermixed Al-Mg corrosion barrier layers. The corrosion-resistant Mg/SiC multilayers can achieve high reflectance simultaneously in up to three narrow wavelength bands within the 25-80 nm wavelength region, making them attractive candidates for solar physics instrumentation and for other applications.

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In-band and out-of-band reflectance calibrations of the EUV multilayer mirrors of the atmospheric imaging assembly instrument aboard the Solar Dynamics Observatory

Cited by 14 publications

References 10 publications

Triple-wavelength, narrowband Mg/SiC multilayers with corrosion barriers and high peak reflectance in the 25-80 nm wavelength region

Triple-wavelength, narrowband Mg/SiC multilayers with corrosion barriers and high peak reflectance in the 25-80 nm wavelength region

Multisegmented, multilayer-coated mirrors for the Solar Ultraviolet Imager

Corrosion-resistant high-reflectance Mg/SiC multilayer coatings for solar physics in the 25-80 nm wavelength region

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