The MICADO first light imager for the ELT: design and performance of the focal plane mechanism prototype

Kateryna Kravchenko; Sebastian Rabien; Matthias Deysenroth; Luis Neumeier; Lenard Spallek; Mathias Honsberg; Lothar Barl; Julian Ziegleder; Eckhard Sturm; Richard Davies

doi:10.1117/12.3017749

26 August 2024 The MICADO first light imager for the ELT: design and performance of the focal plane mechanism prototype

Kateryna Kravchenko, Sebastian Rabien, Matthias Deysenroth, Luis Neumeier, Lenard Spallek, Mathias Honsberg, Lothar Barl, Julian Ziegleder, Eckhard Sturm, Richard Davies

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 1310035 (2024) https://doi.org/10.1117/12.3017749
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

MICADO is a first-generation instrument for the ELT. It will provide diffraction-limited imaging in standard, astrometric, and coronagraphic modes and long-slit spectroscopy at near-infrared wavelengths. The core of the MICADO instrument is its cryostat, which cools the internal optical and mechanical subsystems to 80 K. Following a light ray entering the cryostat through the entrance window, the first mechanism it encounters is the Focal Plane Mechanism. It consists of two independent movable devices mounted in one assembly: the aperture wheel and the focal plane wheel. The primary purpose of the aperture wheel is to rapidly block the light path, which is needed to mitigate persistence on the detectors. The focal plane wheel holds field stops, calibration masks, slits, and coronagraphs. The positioning requirements for the wheel are dominated by the coronographic masks demanding a 15 μm RMS repeatability. To fulfill this specification and avoid mechanical wear in the drive, a novel magnetically coupled gear system was developed at the Max Planck Institute for Extraterrestrial Physics (MPE). A magnetically coupled worm gear uses magnetic forces to transmit torque from the motor to the driven component without direct mechanical contact. This paper describes the design and performance of the magnetic drive and the first results of the focal plane wheel prototype tests in a cryogenic environment.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Kateryna Kravchenko, Sebastian Rabien, Matthias Deysenroth, Luis Neumeier, Lenard Spallek, Mathias Honsberg, Lothar Barl, Julian Ziegleder, Eckhard Sturm, and Richard Davies "The MICADO first light imager for the ELT: design and performance of the focal plane mechanism prototype", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 1310035 (26 August 2024); https://doi.org/10.1117/12.3017749

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