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|Title:||Progress in ion beam figuring of very thin slumped glass plates for lightweight x-ray telescope||Authors:||CIVITANI, Marta Maria
De Roo, C. T.
Schwartz, E. D.
Reid, P. B.
|Issue Date:||2018||Volume:||Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray||Editors:||den Herder, Jan-Willem A.; Nikzad, Shouleh; Nakazawa, Kazuhiro||Series:||PROCEEDINGS OF SPIE||Number:||10699||First Page:||106990T||Abstract:||The combination of the hot slumping and the Ion Beam Figuring (IBF) technologies can be a very competitive solution for the realization of x-ray optics with excellent imaging capabilities and high throughput. While very thin mirrors segments can be realized by slumping with residual figure errors below few hundreds of nanometres, a non-contact and deterministic process (dependent on dwell time), like IBF, is a very effective post facto correction, as it avoids all the problems due to the handling and the supporting system. In the last years, the two processes were proven compatible with very thin sheet of Eagle XG glasses (0.4 mm thickness). Nevertheless, the fast convergence of the process is a key factor to limit the cost of the mirror plate production. A deeper characterization of removal function stability showed that its repeatability between each run has to be improved for a real enhancement of the process convergence factor. A new algorithm based on de-convolution has been implemented and tested, with important advantages in terms of calculation speed, minimum material removal and optimization possibilities. By analysing the metrological data of test slumped glasses, we showed how the IBF is effective in the correction of figure errors on scales above 8 - 10 mm. An overall figuring time of few hours is required with surface error around 100 nm rms. Thanks to the thickness measurement data, which are performed in transmission mode with an interferometric set-up, we demonstrated that it is possible to disentangle the effective amount of the material removed and the deformations introduced during the process.||Conference Name:||Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray||Conference Place:||Austin, Texas, United States||Conference Date:||10-15 June, 2018||URI:||http://hdl.handle.net/20.500.12386/30069||URL:||https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10699/2313599/Progress-in-ion-beam-figuring-of-very-thin-slumped-glass/10.1117/12.2313599.short?SSO=1||ISSN:||0277-786X||ISBN:||9781510619517
|Appears in Collections:||3.01 Contributi in Atti di convegno|
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checked on Jun 14, 2021
checked on Jun 14, 2021
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