New developments in light material overcoating for soft x-ray reflectivity enhancement

V. Cotroneo; D. Spiga; R. Bruni; W. Burkert; M. Freyberg; G. Hartner; G. Pareschi; S. Romaine

doi:10.1117/12.790686

15 July 2008 New developments in light material overcoating for soft x-ray reflectivity enhancement

V. Cotroneo, D. Spiga, R. Bruni, W. Burkert, M. Freyberg, G. Hartner, G. Pareschi, S. Romaine

Proceedings Volume 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray; 701119 (2008) https://doi.org/10.1117/12.790686
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

X-ray Wolter focusing telescopes concentrate the light by means of reflection on smooth surfaces at small grazing angle (below a couple of degrees). The traditional coatings for these kind of applications are heavy materials that, due to their high density, present a high critical energy for total reflection. Recent works have shown how a thin layer of a light material, like carbon, on top of a traditional reflecting coating, can enhance the reflectivity in soft x-ray spectral region (below 5 keV), without degrading the performances for higher energies. We presented at SPIE 2007 some experimental results about the reflectivity measurement at very low energies (200 eV) and rather large angles (1-2 deg). In the present work we extend the former study, by the realization of a new set of samples with coatings made of different materials (Pt, Au, W, Ir) and the measurement of their reflectivity for the typical angles (< 1°) and energies (1-10 keV) employed in astronomical grazing incidence telescopes.

Citation Download Citation

V. Cotroneo, D. Spiga, R. Bruni, W. Burkert, M. Freyberg, G. Hartner, G. Pareschi, and S. Romaine "New developments in light material overcoating for soft x-ray reflectivity enhancement", Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 701119 (15 July 2008); https://doi.org/10.1117/12.790686

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