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Telescope baffle performance for Lyman Far Ultraviolet Spectrographic Explorer.

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    A new baffle system for the Lyman Far Ultraviolet Spectrographic Explorer (Lyman) telescope protects its field of view from stray light. This ensures clear observations of faint stars by minimizing interference from bright sources.

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    Area of Science:

    • Space exploration
    • Optical astronomy
    • Telescope design

    Background:

    • The Lyman Far Ultraviolet Spectrographic Explorer (Lyman) telescope utilizes a Wolter type II glancing incidence design.
    • Accurate guidance on faint stars (m(v) = 16) necessitates protection from stray light.
    • Out-of-field bright sources pose a significant challenge to observation clarity.

    Purpose of the Study:

    • To describe a visible light baffle system for the Lyman telescope.
    • To quantify the stray light reduction capabilities of the baffle.
    • To estimate background brightness on the detector.

    Main Methods:

    • Computed total point-source transmittances for incident beams (0-70°).
    • Estimated background brightness contributions from sunlight and earthshine.
    • Accounted for scattering from baffle surfaces and diffraction effects.

    Main Results:

    • The baffle system effectively mitigates stray light.
    • Calculations provide quantitative data on the baffle's performance.
    • Estimates of background brightness were established.

    Conclusions:

    • The developed baffle system is crucial for the Lyman telescope's mission.
    • It enables high-precision observations by minimizing optical interference.
    • The design considerations address key challenges in space-based astronomy.