Physics – Optics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spie.7437e..11c&link_type=abstract
Optics for EUV, X-Ray, and Gamma-Ray Astronomy IV. Edited by Conconi, Paolo; Pareschi, Giovanni; Campana, Sergio; Citterio, Ober
Physics
Optics
2
Scientific paper
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.
Campana Sergio
Citterio Oberto
Civitani M. M.
Conconi Paolo
Cotroneo Vincenzo
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