ATHENA (Advanced Telescope for High-ENergy Astrophysics) is the next high-energy astrophysical mission of the European Space Agency. Media Lario leads an industrial and scientific team that has developed a process to align and integrate more than 700 silicon pore optics mirror modules into the ATHENA X-ray telescope. The process is based on the ultra-violet imaging at 218 nm of each mirror module on the focal plane of a 12 m focal length optical bench. Specifically, the position of the centroid of the point spread function produced by each mirror module when illuminated by a collimated plane is used to align each mirror module. Experimental integration tests and correlation with X-ray measurement at the PANTER test facility in Münich have demonstrated that this process meets the accuracy requirement. This technique allows arbitrary integration sequence and mirror module exchangeability. Moreover, it enables monitoring the telescope point spread function during the integration phase.

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G. Valsecchi, F. Marioni, G. Bianucci, F. E. Zocchi, D. Gallieni, G. Parodi, M. Ottolini, M. Collon, G. Pareschi, D. Spiga, M. Bavdaz, E. Wille, and V. Burwitz, "Results of silicon pore optics mirror modules optical integration in the ATHENA telescope," Proc. SPIE 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray, 106990Z (Presented at SPIE Astronomical Telescopes + Instrumentation: June 12, 2018; Published: 6 July 2018); https://doi.org/10.1117/12.2309925.