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Assembly of Confocal Silicon Pore Optic Mirror Modules for Athena

Nicolas M. Barriere,Ljubisa Babic,Alex Bayerle,Luigi Castiglione,Maximilien J. Collon,Noe Eenkhoorn,David Girou,Ramses Gunther,Enrico Hauser,Yvette Jenkins,Boris Landgraf,Laurens Keek,Ben Okma, Gregorio Mendoza Serano,Aniket Thete,Giuseppe Vacanti,Sjoerd Verhoeckx,Mark Vervest,Luc Voruz,Marco W. Beijersbergen,Marcos Bavdaz,Eric Wille,Ivo Ferreira,Sebastiaan Fransen,Mark Olde Riekerink,Jeroen Haneveld,Bart Schurink,Ronald Start,Coen van Baren,Evelyn Handick,Michael Krumrey,Giuseppe Valsecchi,Miranda Bradshaw,Vadim Burwitz

OPTICS FOR EUV, X-RAY, AND GAMMA-RAY ASTRONOMY X（2021）

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Abstract
Silicon Pore Optic (SPO) is the X-ray mirror technology selected for the Athena X-ray observatory. The optic is modular; in the current design, it is made of about 700 co-aligned mirror modules. SPO is produced as stacks of 35 mirror plates, which are then paired to form X-ray Optics Units (XOUs) following a modified Wolter I geometry. A mirror module is composed of two confocal XOUs bonded in between a pair of brackets allowing interfacing to the mirror structure. Mirror modules are assembled using the XPBF 2.0 beamline of PTB at the synchrotron radiation facility BESSY II, using pencil beam and dedicated jigs. In this paper we present the challenges and solutions related to making confocal mirror modules.
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Key words
X-ray optics,Modular optics,Silicon Pore Optics,Alignment
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