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The replica technique by electroforming the mirrors from mandrels, has been chosen for the manufacture of the X-ray optics of the SAX imaging concentrators. This technique ia also emerging as a promising cost-effective process for the construction of the mirror shells for high throughput X-ray optics telescopes with angular resolution of tens of arcsac. A key point in this process is the manufacture of the mandrels (or masters) with the required specifications for the geometrical profile and surface finishing. Possible cost-effective solutions for the production of the mandrels are: 1) to achieve the required profile by diamond turning and to improve the surface finishing by means of a lacquer coating process or 2) to reach the correct geometrical shape with a conventional lathe or grinding machine and, after a moderate surface polishing, to coat it with a lacquer layer. This paper presents the results obtained during the verification of these approaches.
G. Conti,G. Bonelli,E. Mattaini,E. Santambrogio,O. Citterio,H. Brauninger, andW. Burkert
"Lacquer Coated Mandrels For Production Of Replicated X-Ray Optics.", Proc. SPIE 1140, X-Ray Instrumentation in Medicine and Biology, Plasma Physics, Astrophysics, and Synchrotron Radiation, (27 November 1989); https://doi.org/10.1117/12.961848
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G. Conti, G. Bonelli, E. Mattaini, E. Santambrogio, O. Citterio, H. Brauninger, W. Burkert, "Lacquer Coated Mandrels For Production Of Replicated X-Ray Optics.," Proc. SPIE 1140, X-Ray Instrumentation in Medicine and Biology, Plasma Physics, Astrophysics, and Synchrotron Radiation, (27 November 1989); https://doi.org/10.1117/12.961848