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

MPS-Authors

Barboza,  Santiago
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pott,  Jörg-Uwe
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rohloff,  Ralf-Rainer
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Müller,  Friedrich
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hofferbert,  Ralph
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Münch,  Norbert
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mohr,  Lars
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ramos,  José
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ebert,  Monica
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Glück,  Martin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wagner,  Jörg
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kärcher,  Hans J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Schlossmacher,  Wolfram
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Häberle,  Maximilian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018SPIE10702E..8TB
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Citation

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.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CF14-C
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.