Design optimization and trade-off study of WFXT optics

Paolo Conconi; Giovanni Pareschi; Sergio Campana; Oberto Citterio; Marta Civitani; Vincenzo Cotroneo; Laura Proserpio; Gianpiero Tagliaferri; Giancarlo Parodi

doi:10.1117/12.827468

31 August 2009 Design optimization and trade-off study of WFXT optics

Paolo Conconi, Giovanni Pareschi, Sergio Campana, Oberto Citterio, Marta Civitani, Vincenzo Cotroneo, Laura Proserpio, Gianpiero Tagliaferri, Giancarlo Parodi

Author Affiliations +

Proceedings Volume 7437, Optics for EUV, X-Ray, and Gamma-Ray Astronomy IV; 74370D (2009) https://doi.org/10.1117/12.827468
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

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.

Citation Download Citation

Paolo Conconi, Giovanni Pareschi, Sergio Campana, Oberto Citterio, Marta Civitani, Vincenzo Cotroneo, Laura Proserpio, Gianpiero Tagliaferri, and Giancarlo Parodi "Design optimization and trade-off study of WFXT optics", Proc. SPIE 7437, Optics for EUV, X-Ray, and Gamma-Ray Astronomy IV, 74370D (31 August 2009); https://doi.org/10.1117/12.827468

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