Development of high angular resolution x-ray telescopes based on slumped glass foils

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

doi:10.1117/12.925975

Cited by 10 publications

(11 citation statements)

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“…Improved surface roughness of the slumped glasses was obtained with this mould [10]. Still the pressure value could not be set higher than the standard 50 g/cm 2 , in order to not degrade the slumped glass surface. In Fig.…”

Section: Measurementsmentioning

confidence: 84%

“…Another key factor is the applied pressure, that helps reducing the mid frequency errors. The resulting CUP maps of two glasses slumped with pressure of 50 g/cm 2 and 20 g/cm 2 are compared in Fig 5: the higher mid frequency errors content is evident in the glass slumped with lower pressure (Fig. 5, right).…”

Section: Measurementsmentioning

confidence: 99%

“…The resulting Half Energy Width (HEW) was 80 arcsec, affected by a high surface roughness, because of the utilization of a metal membrane for pressure application and poorly shaped integration moulds in Metapore, a material difficult to figure precisely. The subsequent prototype, XOU-BB (X-Ray Optical Unit Bread Board) was then realized with D263 glass foils slumped on moulds of different materials and using different settings for the application of pressure [2]. Its main goal was to manufacture a complete optical unit model of the IXO optical system, demonstrating in particular the capability of stacking of plate pairs with the IMA.…”

Section: State-of-the-art Performancesmentioning

confidence: 99%

“…Each individual glass of the XOU has to be curved in a furnace with a proper thermal cycle fit to enable a good surface roughness and the optimal curvature. In our laboratories we have developed a slumping process assisted by pressure [2], whose setup has been patented (TO2013A000687, 12/08/2013). In Fig 1 we show the furnace, the slumping mould, the glass and the muffle to enable the pressure application.…”

Section: Slumped Glass Optics Technologymentioning

confidence: 99%

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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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Section: Measurementsmentioning

confidence: 84%

Section: Measurementsmentioning

confidence: 99%

Section: State-of-the-art Performancesmentioning

confidence: 99%

Section: Slumped Glass Optics Technologymentioning

confidence: 99%

See 2 more Smart Citations

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

Self Cite

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“…The slumping technology has already been successfully employed for the production of NuSTAR telescope, launched in 2012 [9], [10], able to deliver an image quality at focus of 45 arcsec HEW [11]. Additional studies are currently on going both by American and European research groups to further expand the technology in terms of achievable optical quality (the goal being 5 arcsec HEW) [12], [13]. The use of glass for the manufacturing of mirror segments, and possibly also for structural elements, ensures to meet the stringent mass requirements of space missions.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the surface strength of glass plates shaped by hot slumping process

et al. 2013

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Abstract:The Hot Slumping Technology is under development by several research groups in the world for the realization of grazing-incidence segmented mirrors for X-ray astronomy, based on thin glass plates shaped over a mould at temperatures above the transformation point. The performed thermal cycle and related operations might have effects on the strength characteristics of the glass, with consequences on the structural design of the elemental optical modules and consecutively on the entire X-ray optic for large astronomical missions like for example IXO and ATHENA. The mechanical strength of glass plates after they underwent the slumping process was tested through destructive double-ring tests in the Weibull statistic to assess the current IXO glass X-ray telescope design, in terms of survival probability, when subject to static and acoustic loads characteristic of the launch phase. The paper describes the activities performed and presents the obtained results.

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Fractal surface for calibration of an optical profiler

Shen

Chen

et al. 2014

Optik

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Development of high angular resolution x-ray telescopes based on slumped glass foils

Cited by 10 publications

References 0 publications

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

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

Evaluation of the surface strength of glass plates shaped by hot slumping process

Fractal surface for calibration of an optical profiler

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