20 August 2018 Simulating the optical performances of the ATHENA x-ray telescope optics
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Abstract
The ATHENA (Advanced Telescope for High Energy Astrophysics) X-ray observatory is an ESA-selected L2 class mission. In the proposed configuration, the optical assembly has a diameter of 2.2 m with an effective area of 1.4 m2 at 1 keV, 0.25 m2 at 6 keV, and requires an angular resolution of 5 arcsec. To meet the requirements of effective area and angular resolution, the technology of Silicon Pore Optics (SPO) was selected for the optics implementation. The ATHENA’s optic assembly requires hundreds of SPOs mirror modules (MMs), obtained by stacking wedged and ribbed silicon wafer plates onto silicon mandrels to form the Wolter-I configuration. Different factors can contribute to limit the imaging performances of SPOs, such as i) diffraction through the pore apertures, ii) plate deformations due to fabrication errors and surface roughness, iii) alignment errors among plates in an MM, and iv) co-focality errors within the MMs assembly. In order to determine the fabrication and assembling tolerances, the impact of these contributions needs to be assessed prior to manufacturing. A set of simulation tools responding to this need was developed in the framework of the ESA-financed projects SIMPOSIuM and ASPHEA. In this paper, we present the performance simulation obtained for the recentlyproposed ATHENA configuration in terms of effective area, and we provide a simulation of the diffractive effects in a pair of SPO MMs. Finally, we present an updated sizing of magnetic diverter (a Halbach array) and the magnetic fields levels that can be reached in order to deviate the most energetic protons out of the detector field.
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Giorgia Sironi, Giorgia Sironi, Daniele Spiga, Daniele Spiga, Desiree Della Monica Ferreira, Desiree Della Monica Ferreira, Ivo Ferreira, Ivo Ferreira, Marcos Bavdaz, Marcos Bavdaz, Erik Bergback Knudsen, Erik Bergback Knudsen, Giovanni Bianucci, Giovanni Bianucci, Finn Erland Christensen, Finn Erland Christensen, Maximilien Collon, Maximilien Collon, Fabio Marioni, Fabio Marioni, Giovanni Pareschi, Giovanni Pareschi, Arne 'S Jagers, Arne 'S Jagers, Bianca Salmaso, Bianca Salmaso, Brian Shortt, Brian Shortt, Gianpiero Tagliaferri, Gianpiero Tagliaferri, Giuseppe Vacanti, Giuseppe Vacanti, Paolo Conconi, Paolo Conconi, Giuseppe Valsecchi, Giuseppe Valsecchi, Niels J. Westergaard, Niels J. Westergaard, Eric Wille, Eric Wille, Sonny Massahi, Sonny Massahi, } "Simulating the optical performances of the ATHENA x-ray telescope optics", Proc. SPIE 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray, 106993N (20 August 2018); doi: 10.1117/12.2315019; https://doi.org/10.1117/12.2315019
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