Accurate integration of segmented x-ray optics using interfacing ribs

Civitani, M.; Basso, S.; Citterio, O.; Conconi, P.; Ghigo, M.; Pareschi, G.; Proserpio, L.; Salmaso, B.; Sironi, G.; Spiga, D.; Tagliaferri, G.; Zambra, A.; Martelli, Francesco; Parodi, Giancarlo; Fumi, Pierluigi; Gallieni, Daniele; Tintori, Matteo; Bavdaz, Marcos; Wille, Eric

doi:10.1117/1.oe.52.9.091809

Cited by 23 publications

(20 citation statements)

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“…SPO has been selected by ESA as the baseline technology for Athena, but slumped glass optics have been investigated as a backup technology [10] in Europe. Slumped Glass Optics from the US are used for the NuSTAR small explorer mission [11] and further developments to improve the optical performance for high resolution x-ray observatories are being undertaken by NASA [12].…”

Section: State-of-the-art X-ray Opticsmentioning

confidence: 99%

European x-ray optics for next generation space observatories

Wille

Bavdaz

2015

Acta Astronautica

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Section: State-of-the-art X-ray Opticsmentioning

confidence: 99%

European x-ray optics for next generation space observatories

Wille

Bavdaz

2015

Acta Astronautica

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“…The advantage of the SPO is the compactness of the optical stack, even if it does not mean a lower mass because the gain of a smaller optical mirror shells, and therefore lighter mechanical structure and ribs, can be balanced by an increase of the mass due to the higher ribs vignetting into the optics. Considering the prototypes recently developed with a focal length of 20m, for the SPO the open area ratio is in the order of 65% [4] , while for the SGO, it is nearly 84% [8] . The focal length for the Athena mission is reduced from 20m to 12m with respect to the IXO mission and this change leads to an important impact on the design of a X Optical Unit (XOU).…”

Section: Introductionmentioning

confidence: 99%

A high resolution large x-ray mission based on thin glass: optomechanical design

et al. 2014

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The technology of X-ray optics based on very thin glass sheets curved on mandrels figured to an optical quality have been quickly developed in these last years, as the on flight NUSTAR or the glass solutions for the IXO mission have demonstrated. Different possibilities to freeze the correct shape can be chosen and the constrains to the glass can widely affect the response in term of strength and quality. This study shows the opto-mechanical performances of the design based on the hot slumped glass sheets stiffed with reinforcing ribs. With this concept a glass stack can be integrated into a mechanical structure in order to form a module that can be assembled in a large structure. The considered input data and requirements are those specified for the proposed Athena mission. Different types of materials are considered following the latest progress in the slumping and the availability of alternative tougher glass. Static and dynamic FE analyses coupled with ray-tracing are performed in order to reach a high resolution (less than 5 arcsec). Also an optimization of the ribs distribution is implemented in function of the radius of curvature.

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“…We obtain this step via an ad-hoc designed and developed machine named Integration Machine (IMA) (Fig.2). The glasses are stacked and glued with glass ribs which, in addition to keep the mirror aperture clear by a proper spacing, endow the structure with mechanical stiffness, and eventually freeze into the glasses the Wolter-I profiles of the integration mould, thus correcting for residual low frequency error profiles [5]. Finite Element Analysis was performed with the ANSYS software [6] to evaluate the capability of the process to correct the initial errors at different spatial wavelengths: the basic result is that long-period errors are corrected almost entirely, whereas errors over a few cm scale remain almost unchanged after the integration.…”

Section: Slumped Glass Optics Technologymentioning

confidence: 99%

Direct hot slumping of thin glass foils for future generation x-ray telescopes: current state of the art and future outlooks

Salmaso

Basso

Brizzolari

et al. 2017

International Conference on Space Optics — ICSO 2014

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To significantly improve the performances of the current X-ray observatories, the next generation of X-ray telescopes has to be characterized by a large effective area (A eff ~ 2 m 2 at 1 keV) and angular resolution better than 5 arcsec. The large dimension implied by these requirements forces the use of a modular approach, splitting the optics into segments. Moreover, lightweight materials, such as glass, have to be selected for the segmented optics in order to maintain a manageable weight for the optics. Since 2009 we are developing a direct hot slumping technique assisted by pressure, in which the glass optical surface is in contact with the mould and a pressure is applied in order to force the glass to copy the mould shape. A cold slumping step is used then to integrate the mirror segments into the final Wolter-I configuration. We present the state of the art of our hot slumping technology, comparing the results obtained with different glass types and mould materials. We also provide an overview of the possibilities of this technology also in view of future developments.

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Accurate integration of segmented x-ray optics using interfacing ribs

Cited by 23 publications

References 0 publications

European x-ray optics for next generation space observatories

European x-ray optics for next generation space observatories

A high resolution large x-ray mission based on thin glass: optomechanical design

Direct hot slumping of thin glass foils for future generation x-ray telescopes: current state of the art and future outlooks

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