Spectral Slicing X-Ray Telescope

Hoover, Richard B.; Shealy, David L.; Chao, Shao-Hua

doi:10.1117/12.7973937

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…We obtained our normal-incidence images of the sun, using a Cassegrain telescope mounted on the Stanford-Marshall Space Flight Center (MSFC) rocket spectroheliograph instrument. This instrument contained nine optical systems: four systems, including the Cassegrain telescope, had normal-incidence optics exclusively, four had normal-incidence optics in conjunction with grazing-incidence optics, and one had grazing-incidence optics exclusively (12,26,27). The Cassegrain telescope had a bandpass centered at 173 A.…”

Section: T He Study Of the Solar Atmosphere Is Complicated Inmentioning

confidence: 99%

“…We anticipate that multilayer telescopes will provide solar x-ray images with spatial resolution approaching 0.1 arc second in the near future in well-defined spectral bands with excellent sensitivity. Additional capabilities that can be anticipated with multilayer optics, such as multilayer gratings, zone plates, and compound systems incorporating grazing-incidence primary mirrors and multilayer magnifying optics (27) or multilayer Rowland circle grating or "crystal" spectrometers (19) should extend the utility of multilayer optics to shorter wavelengths and provide astronomers with powerfiul high spectral 1786 resolution instruments that are stigmatic. These instruments should allow the study offundamental problems in solar physics such as (i) the structure, dynamics, and energy balance (including the heating source or sources) of coronal loops, (ii) the mechanism responsible for generating the solar wind, and (iii) the configurations in the corona which are necessary for the onset of flares.…”

Section: T He Study Of the Solar Atmosphere Is Complicated Inmentioning

confidence: 99%

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Soft X-Ray Images of the Solar Corona With a Normal-Incidence Cassegrain Multilayer Telescope

Walker

Lindblom

Barbee

et al. 1988

Space Optics for Astrophysics and Earth and Planetary Remote Sensing

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High resolution images of the sun in the soft x-ray/extreme ultraviolet (XUV) regime have been obtainec with normal-incidence Cassegrain multilayer telescopes for the first time. The inherent energy selective property of multilayer-coated optics allowed distinct groups of emission lines to be isolated in the solar corona and the transition region. The sounding rocket borne soft x-ray telescopes [1] were launched on October 23, 1987. In addition to the Cassegrain telescopes, which provided images in bands centered at 173 Å and 256 Å, the payload contained concave spherical mirror multilayer telescopes operating at 44 Å and 256 Å, and convex multilayer mirrors which magnified and spectroscopically analyzed the image produced by a grazing-incidence primary mirror. The images obtained with the Cassegrain telescope operated in the bandpass centered at 173 Å, which is dominated by emission from the ions Fe IX and Fe X, are presented here. This emission is from coronal plasma in the temperature range 0.8 x 106 to 1.3 x 106 K. The images have angular resolution of ~1.0 to 1.5 arc seconds, and show no degradation due to x-ray scattering. Many features of coronal structure, including magnetically confined loops of hot plasma, coronal plumes, polar coronal holes, faint structures on the size scale of supergranulation and smaller, and features due to overlying cool prominences are visible in the images. The density structure of polar plumes has been derived from the observations. The images were recorded on a new type of XUV sensitive film. Our 64 second exposure of the sun in the bandpass 171 - 175 Å is shown below.

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Section: T He Study Of the Solar Atmosphere Is Complicated Inmentioning

confidence: 99%

Section: T He Study Of the Solar Atmosphere Is Complicated Inmentioning

confidence: 99%

Soft X-Ray Images of the Solar Corona With a Normal-Incidence Cassegrain Multilayer Telescope

Walker

Lindblom

Barbee

et al. 1988

Space Optics for Astrophysics and Earth and Planetary Remote Sensing

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“…The wavelength region of a “water window” (2.3 < λ < 4.4 nm) attracted considerable interest over the last few decades. Extraordinary contrast between the absorptivity of carbon and oxygen provides great opportunities for using soft X-ray microscopy to visualize nanostructures in an aqueous environment inside a cell [1,2,3,4]. Various light sources that can produce coherent soft X-ray in the “water window” region have also been developed [5,6].…”

Section: Introductionmentioning

confidence: 99%

Evolution of the Internal Structure of Short-Period Cr/V Multilayers with Different Vanadium Layers Thicknesses

Huang

Fei

et al. 2019

Materials

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Cr/V multilayer mirrors are suitable for applications in the “water window” spectral ranges. To study factors influencing the internal microstructure of Cr/V multilayers, multilayers with different vanadium layers thicknesses varying from 0.6 nm to 4.0 nm, and a fixed thickness (1.3 nm) of chromium layers, were fabricated and characterized with a set of experimental techniques. The average interface width characterizing a cumulative effect of different structure irregularities was demonstrated to exhibit non-monotonous dependence on the V layer thickness and achieve a minimal value of 0.31 nm when the thickness of the V layers was 1.2 nm. The discontinuous growth of very thin V films increased in roughness as the thickness of V layers decreased. The columnar growth of the polycrystalline grains in both materials became more pronounced with increasing thickness, resulting in a continuous increase in the interface width to a maximum of 0.9 nm for a 4 nm thickness of the V layer.

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Aberration Theory for Grazing-Incidence Systems

Korsch¹

1991

Reflective Optics

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Spectral Slicing X-Ray Telescope

Cited by 5 publications

References 14 publications

Soft X-Ray Images of the Solar Corona With a Normal-Incidence Cassegrain Multilayer Telescope

Soft X-Ray Images of the Solar Corona With a Normal-Incidence Cassegrain Multilayer Telescope

Evolution of the Internal Structure of Short-Period Cr/V Multilayers with Different Vanadium Layers Thicknesses

Aberration Theory for Grazing-Incidence Systems

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