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Ion beam figuring approach for thermally sensitive space optics.

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    |November 10, 2016
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    Ion beam figuring (IBF) of space mirrors generates heat, affecting accuracy. Optimizing dwell time distribution significantly reduced peak temperatures and improved surface accuracy, proving the thermal analysis effectiveness.

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    Area of Science:

    • Optical engineering
    • Materials science
    • Thermal analysis

    Background:

    • Ion beam figuring (IBF) of space mirrors is susceptible to thermal effects from heat generation.
    • Elevated temperatures can cause thermal deformation and stress release in adhesive layers, compromising mirror surface accuracy.
    • Existing methods lack comprehensive thermal effect simulation for the entire IBF process.

    Purpose of the Study:

    • To analyze heat generation mechanisms during IBF.
    • To develop a method for simulating thermal effects throughout the IBF process.
    • To suppress thermal effects and improve IBF accuracy for space mirrors.

    Main Methods:

    • Established a thermal radiation model for the neutral filament using thermal radiation theory.
    • Developed a surface-type Gaussian heat source model for ion beam sputtering.
    • Utilized ABAQUS finite-element-method software for thermal effect simulation.
    • Experimentally validated the thermal model.

    Main Results:

    • Simulated thermal effects on a 675 mm×374 mm rectangular SiC space mirror.
    • Optimized dwell time distribution to reduce peak adhesive layer temperature below the designed value.
    • Reduced root-mean-square (RMS) surface error from 0.094λ to 0.015λ (λ=632.8 nm) after one figuring round.

    Conclusions:

    • The developed thermal model accurately predicts thermal effects during IBF.
    • Optimizing dwell time distribution is an effective strategy for suppressing thermal effects.
    • The method significantly improves the accuracy of ion beam figuring for space optics.