GREGOR: Optics Redesign and Updates from 2018-2020
Lucia Kleint, Thomas Berkefeld, Miguel Esteves, Thomas Sonner, Reiner, Volkmer, Karin Gerber, Felix Kr\"amer, Olivier Grassin, Svetlana Berdyugina
TL;DR
This paper details the comprehensive upgrades to the GREGOR telescope from 2018 to 2020, including optics, mechanical, and control system enhancements, resulting in diffraction-limited observational capabilities.
Contribution
It presents the first complete overview of the extensive upgrades and new optical layout implemented on the GREGOR telescope during 2018-2020.
Findings
Achieved diffraction-limited performance since 2020
Exchanged all powered mirrors except M1 since 2012
Implemented significant mechanical and control system improvements
Abstract
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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