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ESA's XEUS x-ray telescope design asks for segmented Wolter 1 mirror plates with radii up to 5 m and a focal length of 50 m. The mirror plates shall have an excellent optical performance (< 5 arcsec HEW). They shall be made by metal (e.g. Nickel) electroforming. This design approach requires highest quality segmented Wolter 1 mandrel plates, with an on-axis HEW < 2 arcsec and a micro-roughness better than 0.3 nm (rms). We will report about the novel design concept, fabrication approach and verification of the x-ray optical performance of the first XEUS demonstration mandrel.
Juergen Altmann,Wilhelm J. Egle,Wolfgang Hafner,Gerhard Derst,Axel Matthes, andThorsten Doehring
"Fabrication of a demonstration mandrel for ESA's XEUS mirror development program", Proc. SPIE 4012, X-Ray Optics, Instruments, and Missions III, (18 July 2000); https://doi.org/10.1117/12.391593
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Juergen Altmann, Wilhelm J. Egle, Wolfgang Hafner, Gerhard Derst, Axel Matthes, Thorsten Doehring, "Fabrication of a demonstration mandrel for ESA's XEUS mirror development program," Proc. SPIE 4012, X-Ray Optics, Instruments, and Missions III, (18 July 2000); https://doi.org/10.1117/12.391593