Mr. Amon Richter Profile

Amon Richter

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Proceedings Article | 29 August 2022 Poster + Paper

The MICADO first light imager for the ELT: final design of primary instrument support, access and supply subsystems

Johann Witschel, Harald Nicklas, H. Anwand-Heerwart, J.-O. Dette, Amon Richter

Proceedings Volume 12184, 121843F (2022) https://doi.org/10.1117/12.2630013

KEYWORDS: Safety, Interfaces, Earthquakes, Control systems, Aluminum, Telescopes

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MICADO is one of the first-light imaging instruments of the ELT and will provide superb imaging capabilities through two AO systems to the community. Being designed to work with the MCAO system MAORY, its additional ability to operate in a stand-alone mode without MAORY includes an additional SCAO wavefront sensing system. Therefore, the instrument support structure has to fulfil two purposes, the positioning of the camera in its stand-alone mode and when it will be mounted downstream of the MCAO facility MAORY. The main instrument structure is addressed here in its basic functions such as passive positioning of the instrument in the two observing modes and linking all its subsystems together. FEA results will be given as well as other performance assessments and design trade-offs. The secondary subsystem, the rotating platform is presented in its two main functions; this platform carries six cabinets containing the instrument’s electric supply, electronic control and data links as well as the supply with coolant liquids and with LN2. It drives additionally the surrounding cable wrap that contains all the supply lines to compensate the instrument’s rotation in a gravity-invariant orientation. Finally, a permanent two-story scaffold provides convenient access to the MICADO instrument in both observing modes, in stand-alone SCAO mode (full 360° access) and in MCAO mode slightly reduced including access to MAORY’s down folding M12 mirror.

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