Development of iridium coated x-ray mirrors for astronomical applications

Döhring, Thorsten; Probst, Anne-Catherine; Emmerich, Florian; Stollenwerk, Manfred; Stehlikova, Veronika; Friedrich, Péter; Damm, Christine

doi:10.1117/12.2273988

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…Astronomical X-ray optics were under development in the Aschaffenburg Competence Center ACCASI ("Aschaffenburg Competence Center for Astronomical and Space Instrumentation") since several years [1]. As part of a Bavarian-Czech cooperation between the Technical University of Aschaffenburg and the Technical University of Prague [2], two geometrically identical telescopes, called HORUS, were built [3].…”

Section: Introductionmentioning

confidence: 99%

Testing of lobster-eye type telescopes with X-rays and visible light

Döhring¹,

Stieglitz²,

Friedrich³

et al. 2023

EUV and X-Ray Optics: Synergy Between Laboratory and Space VIII

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Reflective coatings for astronomical X-ray optics were developed at the “Aschaffenburg Competence Center for Astronomical and Space Instrumentation” (ACCASI) since several years. As part of a Bavarian-Czech cooperation between the Technical University of Aschaffenburg and the Czech Technical University of Prague, now two mechanically identical telescopes were built. One telescope optic was equipped with conventional gold-coated mirrors, manufactured by the Czech project partners. The 34 X-ray mirrors of the second telescope use an innovative coating system made of chromium and iridium, which was applied at the Aschaffenburg coating laboratory. Both telescopes are designed according to the bionic principle of a reflecting lobster eye. The optics works with two consecutive reflections on mutually perpendicular mirror surfaces. This enables a large field of view with many square degrees in diameter, which, however, comes at the price of a reduced angular resolution. An extensive X-ray characterization of these telescopes was carried out at the PANTER test facility of MPE, which simulates parallel starlight incident on the telescopes. The telescopes have an angular resolution of about 4 arc minutes in X-rays and a focal length of about 2 meters. Furthermore, the used X-ray mirrors reflect and focus visible light as well and this functionality in the optical regime was checked in laboratory tests. Now another test campaign was done to examine the telescope resolution for real objects of the visible sky and the imaging properties for star constellations. Such functional tests by observing astronomical objects of the visible sky may simplify and accelerate the development of X-ray telescopes for satellite applications.

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Section: Introductionmentioning

confidence: 99%

Testing of lobster-eye type telescopes with X-rays and visible light

Döhring¹,

Stieglitz²,

Friedrich³

et al. 2023

EUV and X-Ray Optics: Synergy Between Laboratory and Space VIII

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show abstract

Section: Introductionmentioning

confidence: 99%

Characterization of a lobster-eye type X-ray telescope

et al. 2022

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Lobster-eye type X-ray telescopes use reflecting plano mirrors under grazing incidence and can observe a large field of view. As part of a Bavarian-Czech cooperation, two telescopes were build, equipped with mirrors coated with gold and iridium. Their X-ray characterization was carried out at the PANTER test facility, which simulates parallel starlight incident on the telescopes. The telescopes have an angular resolution of about 4 arc minutes in X-rays and a focal length of about 2 meters. The used X-ray mirrors reflect and focus visible light as well; their functionality in the optical regime was checked in laboratory tests. Now another test campaign will be carried out to examine the telescope resolution for real objects of the visible night sky and the imaging properties for star constellations.

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“…1. Scheme of two different types of telescope design for astronomical X-ray observations [7]. Left -Wolter I telescope design, right -Lobster eye design in Schmidt's arrangement.…”

Section: Introductionmentioning

confidence: 99%

“…However, high coating stress was observed even provoking a delamination from the substrate. To get rid of this delamination problem a thin adhesive chromium (Cr) coating was applied between the substrate and the Ir coating [7]. However, the high coating stress of Ir still induces a disturbing deformation of the mirror substrate when using glass substrates with a thickness below 1 mm.…”

Section: Introductionmentioning

confidence: 99%

Coating stress analysis and compensation for iridium-based x-ray mirrors

et al. 2018

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Iridium-based coatings for mirrors of X-ray telescopes are studied. In particular, stress induced deformation is characterized and shown to be compressive and equal to -1786 MPa. Two methods for stress compensation are then studied. One relies on the deposition of silica on the back surface of the substrate and a second one relies on the deposition of a chromium sublayer. Advantages and drawbacks of each of these techniques are presented.

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Development of iridium coated x-ray mirrors for astronomical applications

Cited by 4 publications

References 3 publications

Testing of lobster-eye type telescopes with X-rays and visible light

Testing of lobster-eye type telescopes with X-rays and visible light

Characterization of a lobster-eye type X-ray telescope

Coating stress analysis and compensation for iridium-based x-ray mirrors

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