Thin Shell, Segmented X-Ray Mirrors

Petre, Robert

doi:10.1155/2010/412323

Cited by 19 publications

(8 citation statements)

References 46 publications

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“…For example, at NASA/Goddard, glass substrates were routinely made to produce 5" HPD mirror pairs for a telescope design at 8.4 m (Wolter Type I, double reflection.) 2,5 A metallic film that is subsequently deposited onto the substrate's surface for x-ray reflection, however, generally has high stress that distorts the mirror. In this paper, we will report the work to mitigate this problem and to achieve coating with negligible distortion.…”

Section: Introduction 11 Segmented Lightweight X-ray Opticsmentioning

confidence: 99%

Coating thin mirror segments for lightweight x-ray optics

et al. 2013

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Next generation's lightweight, high resolution, high throughput optics for x-ray astronomy requires integration of very thin mirror segments into a lightweight telescope housing without distortion. Thin glass substrates with linear dimension of 200 mm and thickness as small as 0.4 mm can now be fabricated to a precision of a few arc-seconds for grazing incidence optics. Subsequent implementation requires a distortion-free deposition of metals such as iridium or platinum. These depositions, however, generally have high coating stresses that cause mirror distortion. In this paper, we discuss the coating stress on these thin glass mirrors and the effort to eliminate their induced distortion. It is shown that balancing the coating distortion either by coating films with tensile and compressive stresses, or on both sides of the mirrors is not sufficient. Heating the mirror in a moderately high temperature turns out to relax the coated films reasonably well to a precision of about a second of arc and therefore provide a practical solution to the coating problem.

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Section: Introduction 11 Segmented Lightweight X-ray Opticsmentioning

confidence: 99%

Coating thin mirror segments for lightweight x-ray optics

et al. 2013

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“…Future high throughput optics for x-ray astronomy requires incorporation of a large number of very thin mirror segments into a very compact telescope 1,2,3,4,5 . The most viable approach for very large x-ray telescopes presently is to concentrically nest thin mirror segments together into modules, which are then integrated to form a large telescope.…”

Section: Preserving Mirror Figures For Lightweight X-ray Opticsmentioning

confidence: 99%

Preserving accurate figures in coating and bonding mirrors for lightweight x-ray telescopes

et al. 2014

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Lightweight, high-resolution, high throughput optics for x-ray astronomy requires fabrication and integration of thin mirrors segments with arc-second precision. In this paper, we present results on our effort leading to the most recent two test modules achieving the intermediate goal of 10 arc-second resolution. We will address issues of coating and bonding thin glass mirrors with negligible distortion. Annealing of sputtered high-density metallic films was found to be sufficiently accurate. We will present result from tests of bonding mirrors onto experimental strongbacks, as well as the sensitivity on bonding procedure, bond parameters and environment.

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“…A two-stage conically approximated Wolter I mirror, previously flown on the SXS rocket payload, with a focal length of 2.1 m is used to focus the image on the detector plane [1,9,10]. The mirror provides an effective area of 300 cm 2 at 1 keV, and a 2.4" point spread function.…”

Section: Introductionmentioning

confidence: 99%

First Operation of TES Microcalorimeters in Space with the Micro-X Sounding Rocket

et al. 2020

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Micro-X is a sounding rocket-borne instrument that uses a microcalorimeter array to perform high-resolution X-ray spectroscopy. This instrument flew for the first time on July 22 nd , 2018 from the White Sands Missile Range, USA. This flight marks the first successful operation of a Transition-Edge Sensor array and its time division multiplexing read-out system in space. This launch was dedicated to the observation of the supernova remnant Cassiopeia A. A failure in the attitude control system prevented the rocket from pointing and led to no time on target. The on-board calibration source provided X-rays in flight, and it is used to compare detector performance during pre-flight integration, flight, and after the successful post-flight recovery. This calibration data demonstrates the capabilities of the detector in a space environment as well as its potential for future flights. 1 The supernova remnant considered for this mission depends on the time of the year. The primary target (Puppis A) is not visible during the summer, so the secondary target was chosen for the first flight.

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Thin Shell, Segmented X-Ray Mirrors

Cited by 19 publications

References 46 publications

Coating thin mirror segments for lightweight x-ray optics

Coating thin mirror segments for lightweight x-ray optics

Preserving accurate figures in coating and bonding mirrors for lightweight x-ray telescopes

First Operation of TES Microcalorimeters in Space with the Micro-X Sounding Rocket

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