Segmented Replicated X-Ray Optics: A Concept for Future Flagship X-Ray Telescope

Next-generation X-ray observatories like the Lynx X-ray Observatory require unprecedented collecting areas approaching 2 m2 with sub-arcsecond angular resolution. This necessitates mirror shells with diameters reaching 3 meters. Conventional full-shell replicated X-ray optics present substantial cost and technical challenges at these scales. Meter-scale optics introduce significant handling complexity despite simplified assembly procedures. The X-ray Optics group at NASA Marshall Space Flight Center (MSFC) is investigating Segmented Replicated X-Ray Optics (SRXO) as an alternative approach. This concept leverages MSFC’s established electroforming replication capabilities refined over three decades. The segmented architecture exploits the azimuthal symmetry of Wolter-type geometries. Multiple shell segments can be replicated from single segmented mandrels, substantially reducing mandrel fabrication costs. Unlike conventional full shells, SRXO can maintain smaller mirror thickness for large diameter shells. This yields significant mass reductions and facilitates improved quality control. This paper introduces the SRXO concept and presents initial results from our feasibility study. We present metrology of fabricated segments along with modeling results to understand the underlying physical processes. These preliminary findings demonstrate the potential viability of the segmented approach for meeting next-generation observatory requirements.