Work

The MICADO Atmospheric Dispersion Corrector: Optomechanical design, expected performance and calibration techniques

Year: 2022

Type: preprint

Abstract: The differential refraction of light passing through the atmosphere can have a severe impact on image quality if no atmospheric dispersion corrector (ADC) is used. For the Extremely Large Telescope (ELT) this holds true well into the infrared. MICADO, the near-infrared imaging camera for the ELT, will employ a cryogenic ADC consisting of two counter-rotating Amici prisms with diameters of 125 mm. The mechanism will reduce the atmospheric dispersion to below 2.5 milli arcseconds (mas), with a set goal of 1 mas. In this report, we provide an overview of the current status of the ADC in development for MICADO. We summarise the optomechanical design and discuss how the cryogenic environment impacts the performance. We will also discuss our plan to use a diffraction mask in the cold pupil to calibrate and validate the performance once the instrument is fully integrated.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2207.02572

Authors: Born, J. A. van den, Romp, R., Janssen, A. W., Navarro, R., Jellema, W., Tolstoy, E., Jayawardhana, B., Hartl, M.

Institutions: AstroTec Holding (Netherlands), Netherlands Institute for Radio Astronomy, University of Groningen, Space Research Organisation Netherlands, Max Planck Institute for Extraterrestrial Physics

Language: English

Topic: Astronomy and Astrophysical Research

Subfield: Instrumentation

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: Leids Kerkhoven-Bosscha Fonds

OpenAlex ID: W4320487605

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