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Proceedings Paper

New developments in light material overcoating for soft x-ray reflectivity enhancement
Author(s): V. Cotroneo; D. Spiga; R. Bruni; W. Burkert; M. Freyberg; G. Hartner; G. Pareschi; S. Romaine
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Paper 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.

Paper Details

Date Published: 15 July 2008
PDF: 10 pages
Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 701119 (15 July 2008); doi: 10.1117/12.790686
Show Author Affiliations
V. Cotroneo, Brera Astronomical Observatory (Italy)
Univ. degli Studi di Milano (Italy)
D. Spiga, Brera Astronomical Observatory (Italy)
R. Bruni, Harvard-Smithsonian Ctr. for Astrophysics (United States)
W. Burkert, MPE PANTER (Germany)
M. Freyberg, MPE PANTER (Germany)
G. Hartner, MPE PANTER (Germany)
G. Pareschi, Brera Astronomical Observatory (Italy)
S. Romaine, Harvard-Smithsonian Ctr. for Astrophysics (United States)

Published in SPIE Proceedings Vol. 7011:
Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray
Martin J. L. Turner; Kathryn A. Flanagan, Editor(s)

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