21 August 2009 Development of a large ion beam figuring facility for correction of optics up to 1.7 m diameter
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Abstract
In the INAF-Astronomical Observatory of Brera (INAF-OAB) a new Ion Beam Figuring Facility, that adds to the previous one, is under advanced construction. The present facility is able to figure optics up to 50 cm in diameter meanwhile the new one is larger and will be able to figure optics up to 1.7 meter. It will employ a Kaufman Ion Source having three degrees of freedom (x-y-z) with step motors and encoders. The source will have two different grid sizes so to be able to figure the optics wit a broad or small removal function depending from the application. The control system will be computer controlled and designed to be autonomous and self-monitoring during the figuring by using a proprietary process control software. This software will use a time matrix map indicating the dwell times required for each pixel of the optical surface. The software and the mathematical tools used to compute the Time Matrix solution has been developed in INAF-OAB as well.
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M. Ghigo, M. Ghigo, S. Cornelli, S. Cornelli, R. Canestrari, R. Canestrari, D. Garegnani, D. Garegnani, } "Development of a large ion beam figuring facility for correction of optics up to 1.7 m diameter", Proc. SPIE 7426, Optical Manufacturing and Testing VIII, 742611 (21 August 2009); doi: 10.1117/12.826433; https://doi.org/10.1117/12.826433
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