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ICF target DT-layer refractive index and thickness from iterative analysis.

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    A new iterative algorithm accurately measures the refractive index and thickness of inertial confinement fusion targets. This method achieves high precision for deuterium-tritium layers and target shells.

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    Area of Science:

    • Plasma Physics
    • Optical Metrology
    • Fusion Energy Research

    Background:

    • Accurate characterization of inertial confinement fusion (ICF) targets is crucial for fusion energy development.
    • Existing methods for measuring target properties like refractive index and thickness can be limited in precision or scope.

    Purpose of the Study:

    • To develop and validate an iterative algorithm for simultaneous retrieval of deuterium-tritium (DT) layer refractive index and thickness in ICF targets.
    • To assess the accuracy and precision of the proposed method through simulations and experimental validation.

    Main Methods:

    • An iterative algorithm utilizing optical path difference (OPD) and ray deflection principles.
    • Simultaneous back-and-forth solving of refractive index and thickness from an initial guess until convergence.
    • Experimental validation using target shells and analysis of uncertainties.

    Main Results:

    • Simulations demonstrate high accuracy for DT-layer refractive index (error < 0.05%) and thickness (error < 0.1%).
    • Experimental results show target shell refractive index and thickness retrieval with relative errors within ±2%.
    • Experimental uncertainties were systematically analyzed.

    Conclusions:

    • The proposed iterative algorithm offers a precise and simultaneous method for characterizing ICF target properties.
    • The technique is validated by simulations and experiments, showing its practical applicability in fusion research.
    • This advancement contributes to improved diagnostics for inertial confinement fusion experiments.