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Proceedings Paper

Design optimization and trade-off study of WFXT optics
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Paper Abstract

X-ray mirrors are usually built in the Wolter I (paraboloid-hyperboloid) configuration which provides, in principle, perfect on-axis images. This design exhibits no spherical aberration on-axis but suffers from field curvature, coma and astigmatism, therefore the angular resolution degrades rapidly with increasing off-axis angles. Different mirror designs exist in which the primary and secondary mirror profiles are expanded as a power series in order to increase the angular resolution at large off-axis positions. Here we present the design and global trade off study of an X-ray mirror systems based on polynomial optics in view of the Wide Field X-ray Telescope (WFXT) mission. WFXT aims at performing an extended cosmological survey in the soft X-ray band with unprecedented flux sensitivity. To achieve these goals the angular resolution required for the mission is very demanding, of 5 arcsec HEW resolution goal to be achieved across a 1-deg field of view, in addition an effective area of 5-9000 cm2 at 1 keV is needed.

Paper Details

Date Published: 31 August 2009
PDF: 10 pages
Proc. SPIE 7437, Optics for EUV, X-Ray, and Gamma-Ray Astronomy IV, 74370D (31 August 2009); doi: 10.1117/12.827468
Show Author Affiliations
Paolo Conconi, INAF-Osservatorio Astronomico di Brera (Italy)
Giovanni Pareschi, INAF-Osservatorio Astronomico di Brera (Italy)
Sergio Campana, INAF-Osservatorio Astronomico di Brera (Italy)
Oberto Citterio, INAF-Osservatorio Astronomico di Brera (Italy)
Marta Civitani, INAF-Osservatorio Astronomico di Brera (Italy)
Vincenzo Cotroneo, INAF-Osservatorio Astronomico di Brera (Italy)
Laura Proserpio, INAF-Osservatorio Astronomico di Brera (Italy)
Gianpiero Tagliaferri, INAF-Osservatorio Astronomico di Brera (Italy)
Giancarlo Parodi, BCV Progetti (Italy)

Published in SPIE Proceedings Vol. 7437:
Optics for EUV, X-Ray, and Gamma-Ray Astronomy IV
Stephen L. O'Dell; Giovanni Pareschi, Editor(s)

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