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Proceedings Paper

Development of multilayer coatings (Ni/C-Pt/C) for hard x-ray telescopes by e-beam evaporation with ion assistance
Author(s): Daniele Spiga; Giovanni Pareschi; Oberto Citterio; Robert Banham; Stefano Basso; Marco Cassanelli; Vincenzo Cotroneo; Barbara Negri; Gabriele Grisoni; Giuseppe Valsecchi; Dervis Vernani
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Paper Abstract

A number of X-ray astronomical missions of near future (XEUS, Constellation-X, SIMBOL-X, HEXIT-SAT, NEXT) will make use of hard X-ray (10-100 keV) optics with broad-band multilayer coatings. To this aim we are developing a multilayer deposition technique for large substrates based on the e-beam deposition technique, improved by the implementation of an ion beam assistance device, in order to reduce the interfacial roughness and improve the reflectivity. The e-beam deposition with ion assistance keeps the film smoothness at a good level and takes the advantage of a reduction of the interlayer stresses. This approach is well suited for the manufacturing of high-reflectance multilayer mirrors for hard X-rays space telescopes where, in addition to a high quality of the deposited films, a volume production is also requested. Moreover, we are also up-grading the replication technique by nickel electroforming, already successfully used for the gold coated soft X-ray mirrors of Beppo-SAX, XMM, JET-X/SWIFT missions, to the case of multilayer coated mirrors. In this paper we will present the technique under development and the implemented deposition facility. Some preliminary, very encouraging, results achieved with the X-ray (8.05 and 17.4 keV) and topographic characterization on flat samples will be discussed.

Paper Details

Date Published: 11 October 2004
PDF: 7 pages
Proc. SPIE 5488, UV and Gamma-Ray Space Telescope Systems, (11 October 2004); doi: 10.1117/12.568751
Show Author Affiliations
Daniele Spiga, Univ. degli Studi di Milano/Bicocca (Italy)
INAF, Osservatorio Astronomico di Brera (Italy)
Giovanni Pareschi, INAF, Osservatorio Astronomico di Brera (Italy)
Oberto Citterio, INAF, Osservatorio Astronomico di Brera (Italy)
Robert Banham, Media Lario s.r.l. (Italy)
Stefano Basso, INAF, Osservatorio Astronomico di Brera (Italy)
Marco Cassanelli, Media Lario s.r.l. (Italy)
Vincenzo Cotroneo, INAF, Osservatorio Astronomico di Brera (Italy)
Barbara Negri, Agenzia Spaziale Italiana (Italy)
Gabriele Grisoni, Media Lario s.r.l. (Italy)
Giuseppe Valsecchi, Media Lario s.r.l. (Italy)
Dervis Vernani, INAF, Osservatorio Astronomico di Brera (Italy)

Published in SPIE Proceedings Vol. 5488:
UV and Gamma-Ray Space Telescope Systems
Guenther Hasinger; Martin J. L. Turner, Editor(s)

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