The coating plant for the M1 primary mirror segments of the Extremely Large Telescope (ELT) currently under construction in Cerro Armazones, Chile by the European Southern Observatory (ESO) will deposit a highly reflective protected-silver-based coating by magnetron sputtering technology. This paper describes how AGC Glass Europe SA, through its business unit AGC Plasma Technology Solutions, realized the design and manufacture of a highly automated coater based on its experience in building large area architectural glass coaters. In addition, some results of pre-acceptance testing in Lauenförde, Germany are reported.
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