GREGOR: Optics Redesign and Updates from 2018-2020

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.

Accepted by A&A, 10 pages

References in corpus (7)

• Unprecedented Fine Structure of a Solar Flare Revealed by the 1.6~m New Solar Telescope
• Opposite polarity field with convective downflow and its relation to magnetic spines in a sunspot penumbra
• The GREGOR Fabry-Pérot Interferometer
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