GREGOR: Optics Redesign and Updates from 2018-2020

Felix Kr\"amer; Karin Gerber; Lucia Kleint; Miguel Esteves; Olivier Grassin; Reiner Volkmer; Svetlana Berdyugina; Thomas Berkefeld; Thomas Sonner

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GREGOR: Optics Redesign and Updates from 2018-2020

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arxiv 2006.11875 v1 pith:DQHQY6UF submitted 2020-06-21 astro-ph.IM astro-ph.SR

Lucia Kleint , Thomas Berkefeld , Miguel Esteves , Thomas Sonner , Reiner Volkmer , Karin Gerber , Felix Krämer , Olivier Grassin

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Svetlana Berdyugina

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The GREGOR telescope was inaugurated in 2012. In 2018, we started a complete upgrade, involving optics, alignment, instrumentation, mechanical upgrades for vibration reduction, updated control systems, and building enhancements and, in addition, adapted management and policies. This paper describes all major updates performed during this time. Since 2012, all powered mirrors except for M1 were exchanged. Starting from 2020, GREGOR observes with diffraction-limited performance and a new optics and instrument layout.

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