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July 06, 2022 preprint Open access Aachen paper

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

arXiv (Cornell University)

DOI: 10.48550/arxiv.2207.02572 Full text (OA) OpenAlex

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.

Authors 8

  1. Joost A. van den Born
  2. R. Romp

    AstroTec Holding (Netherlands) · Netherlands Institute for Radio Astronomy

    Affiliation as printed

    NOVA Optical Infrared Instrumentation Group at ASTRON , Oude Hoogeveensedijk 4 , NL-7991 PD Dwingeloo , the Netherlands

  3. A. W. Janssen

    AstroTec Holding (Netherlands) · Netherlands Institute for Radio Astronomy

    Affiliation as printed

    NOVA Optical Infrared Instrumentation Group at ASTRON , Oude Hoogeveensedijk 4 , NL-7991 PD Dwingeloo , the Netherlands

  4. R. Navarro

    AstroTec Holding (Netherlands) · Netherlands Institute for Radio Astronomy

    Affiliation as printed

    NOVA Optical Infrared Instrumentation Group at ASTRON , Oude Hoogeveensedijk 4 , NL-7991 PD Dwingeloo , the Netherlands

  5. W. Jellema Aachen SRON Netherlands Insitute for Space Research

    University of Groningen · Space Research Organisation Netherlands

    Affiliation as printed

    Kapteyn Astronomical Institute , University of Groningen , PO Box 800 , NL-9700 AV Groningen , the Netherlands

    SRON Netherlands Insitute for Space Research , PO Box 800 , NL-9700 AV Groningen , the Netherlands

  6. Eline Tolstoy

    University of Groningen

    Affiliation as printed

    Kapteyn Astronomical Institute , University of Groningen , PO Box 800 , NL-9700 AV Groningen , the Netherlands

  7. B. Jayawardhana

    University of Groningen

    Affiliation as printed

    Engineering and Technology Institute Groningen , University of Groningen , Nijenborgh 4 , NL-9747 AG Groningen , the Netherlands

  8. M. Hartl

    Max Planck Institute for Extraterrestrial Physics

    Affiliation as printed

    Max-Planck-Institut für extraterrestrische Physik (MPE) , Giessenbachstr. 1 , D-85748 Garching , Germany

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