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Scaled model guidelines for solar coronagraphs' external occulters with an optimized shape.

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    This study numerically validates scaling laws for externally occulted solar coronagraphs. It provides the first simulation of diffraction patterns for optimized occulter shapes, aiding laboratory testing of large-scale instruments.

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    Area of Science:

    • * Astrophysics
    • * Optical Engineering

    Background:

    • * Externally occulted solar coronagraphs face challenges with diffracted light from occulter edges, contributing to stray light that obscures faint coronal signals.
    • * Laboratory testing of large-scale coronagraphs, like those in formation flight, requires validated scaling methods for diffraction patterns.

    Purpose of the Study:

    • * To provide numerical support for scaling laws of solar coronagraph occulter geometry.
    • * To present the first simulation of diffraction patterns behind an optimized occulter shape using the solar disk as a source.
    • * To establish a comprehensive guide for scaling coronagraph geometry for laboratory testing.

    Main Methods:

    • * Numerical simulation of diffraction patterns.
    • * Validation of occulter scale laws.
    • * Analysis of diffraction behind optimized occulter shapes along the optical axis.

    Main Results:

    • * Successful numerical validation of previously proposed occulter scale laws.
    • * First-ever simulation of diffraction patterns for an optimized occulter shape with a solar disk source.
    • * Demonstrated the feasibility of replicating flight diffraction patterns in laboratory settings.

    Conclusions:

    • * The numerical results validate the proposed guidelines for scaling coronagraph geometry.
    • * This work, combined with prior research, offers a complete framework for coronagraph scaling.
    • * The findings facilitate accurate laboratory testing and design of advanced solar coronagraphs.