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Proceedings Paper

X-ray optics for the WFXT telescope
Author(s): Oberto Citterio; Sergio Campana; Paolo Conconi; Mauro Ghigo; Francesco Mazzoleni; Heinrich W. Braeuninger; Wolfgang Burkert; Andreas Oppitz
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Paper Abstract

Wide field x-ray telescope (WFXT) is the core instrument of the Wide Angle X-ray Survey (WAXS) mission, which is aimed at conducting a high angular resolution, high sensitivity x- ray survey over a large solid angle of the sky. The project has been developed as a feasibility study in the frame of the Agenzia Spaziale Italiana (ASI) program for small-medium satellite mission. WFXT uses grazing incidence optics based on a new design where the Wolter I profile is substituted by a five term polynomial profile. The coefficients of the polynomium are optimized to obtain high spatial resolution over a field of view of about 1 degree. The WFXT optics consist of 25 nested shells. In order to have both a large effective area at low energies and a meaningful area at higher energies, a design consisting of 9 large mirror shells and 16 smaller shells, contributing mainly at higher energies, has been developed. The outermost and innermost mirror shells have a diameter of 600 and 226 mm, respectively. The total length of the mirror shells is 120 + 120 mm, while the focal length of the optical system is 3000 mm. For the WFXT optics, in addition to the well proved manufacturing process by nickel electroforming, we considered a novel replication technique for the manufacture of the mirrors which make use of ceramic material like Silicon Carbide in order to meet the stringent requirements of high spatial resolution and low weight. In this paper we give the details of the optical design and report the rest of the x-ray measurements of the prototypes of the outermost mirror shell manufactured with nickel and SiC.

Paper Details

Date Published: 29 September 1999
PDF: 9 pages
Proc. SPIE 3766, X-Ray Optics, Instruments, and Missions II, (29 September 1999); doi: 10.1117/12.363636
Show Author Affiliations
Oberto Citterio, Osservatorio Astronomico di Brera (Italy)
Sergio Campana, Osservatorio Astronomico di Brera (Italy)
Paolo Conconi, Osservatorio Astronomico di Brera (Italy)
Mauro Ghigo, Osservatorio Astronomico di Brera (Italy)
Francesco Mazzoleni, Osservatorio Astronomico di Brera (Italy)
Heinrich W. Braeuninger, Max-Planck-Institut fuer Extraterrestrische Physik (Germany)
Wolfgang Burkert, Max-Planck-Institut fuer Extraterrestrische Physik (Germany)
Andreas Oppitz, Max-Planck-Institut fuer Extraterrestrische Physik (Germany)

Published in SPIE Proceedings Vol. 3766:
X-Ray Optics, Instruments, and Missions II
Richard B. Hoover; Arthur B. C. Walker II, Editor(s)

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