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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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Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0005-CF14-C Versions-Permalink: https://hdl.handle.net/21.11116/0000-0005-CF15-B
Genre: Konferenzband

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

Inhalt

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Schlagwörter: -
 Zusammenfassung: 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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 Datum: 2018
 Publikationsstatus: Erschienen
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 Identifikatoren: ISBN: 9781510619579
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Veranstaltung

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Titel: Ground-based and Airborne Instrumentation for Astronomy VII
Veranstaltungsort: -
Start-/Enddatum: 2018

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