6 October 2011 Fabrication update on non-contact mirror slumping technology for the International X-ray Observatory mirrors
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A method of thermally shaping individual sheets of glass for the International X-Ray Observatory using porous mandrels as air bearings has been developed, which eliminates the problems of sticking and dust particleinduced distortion which plague traditional slumping methods. A detailed mathematical model of the process has been developed, allowing prediction of final glass shape based on process parameters that include air supply pressure, imperfections on the mandrel surface, glass total thickness variations and gravity vector orientation. Experiments to verify model findings are conducted under closed-loop control of pressure and apparatus tilt. Little improvement in repeatability is seen, suggesting that the error is due to unmodeled forces such as contact forces from the glass holding technique. Finally, the design process and fabrication of a third generation slumping tool is presented. In addition to scaling the design to accomodate larger flats, slumps are done horizontally to float the glass and minimize contact during the process. New capabilities of the tool include active gap measurement and control, as well as plenum air temperature monitoring.
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Abdul Mohsen Al Husseini, Abdul Mohsen Al Husseini, Ralf K. Heilmann, Ralf K. Heilmann, Mark L. Schattenburg, Mark L. Schattenburg, "Fabrication update on non-contact mirror slumping technology for the International X-ray Observatory mirrors", Proc. SPIE 8147, Optics for EUV, X-Ray, and Gamma-Ray Astronomy V, 81470N (6 October 2011); doi: 10.1117/12.895413; https://doi.org/10.1117/12.895413

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