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  The MICADO first light imager for ELT: derotator design status and prototype results

Barboza, S., Pott, J.-U., Rohloff, R.-R., Müller, F., Hofferbert, R., Münch, N., et al. (2018). The MICADO first light imager for ELT: derotator design status and prototype results.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CF14-C Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CF15-B
Genre: Proceedings

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https://ui.adsabs.harvard.edu/abs/2018SPIE10702E..8TB (Any fulltext)
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 Creators:
Barboza, Santiago1, Author
Pott, Jörg-Uwe1, Author
Rohloff, Ralf-Rainer1, Author
Müller, Friedrich1, Author
Hofferbert, Ralph1, Author
Münch, Norbert1, Author
Mohr, Lars1, Author
Ramos, José1, Author
Ebert, Monica1, Author
Glück, Martin1, Author
Wagner, Jörg1, Author
Kärcher, Hans J.1, Author
Schlossmacher, Wolfram1, Author
Häberle, Maximilian1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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 Abstract: MICADO is the Multi-AO Imaging Camera for Deep Observations, a first light instrument for the Extremely Large Telescope (ELT). It will provide the ELT with diffraction limited imaging capacity over a 53-arcsec field of view, while operating with the Multi-Conjugate Adaptive Optics (MCAO) module MAORY (0.8-2.5 μm). Here, we present the design status of the MICADO derotator, which at the same time serves (i) as crucial mechanical interface between the cryo-opto-mechanical camera assembly and the instrument support structure and (ii) as high-precision image and wavefront sensor derotator to allow for 50 µas astrometry over the entire MCAO corrected field. Additionally, first test results are presented which were obtained with a derotator prototype based on a scaled 1:2 test bearing. The derotator test stand is essential to explore the limitations of the preferred bearing type in the context of the given requirements. The technical difficulties addressed by the design include: (i) design of adequate mechanical interfaces to minimize mass, deformation and the effect of the warping moment on the bearing and (ii) analysis of the friction-related stick-slip effects at low tracking velocities for the implementation of a suitable position- velocity closed-loop control system. Furthermore, our prototype setup is used to develop and test the required control concept of this high- precision application.

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 Dates: 2018
 Publication Status: Issued
 Pages: -
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 Rev. Type: -
 Identifiers: ISBN: 9781510619579
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Title: Ground-based and Airborne Instrumentation for Astronomy VII
Place of Event: -
Start-/End Date: 2018

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