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Inertial confinement fusion (ICF) is widely used to generate nuclear fusion energy worldwide. The key to successful ICF experiments is to achieve uniformity in cryotargets. To ensure the performance of the cryotarget, the fuel gas must create a uniform and smooth solid layer on the inner surface, with a roughness of less than 1μm and sphericity greater than 99%. Creating a uniform deuterium-deuterium (DD) ice layer is more challenging than making deuterium-tritium (DT) ice. This is due to the lack of self-smoothing caused by the absence of β decay heat. The DD ice layer also has a specific absorption peak in the mid-infrared band. This paper examines using 3.16μm light to heat and evenly distribute DD ice in a cryotarget. Additionally, the article introduces a technique to simulate the evenness of the heating process using the normalized volumetric weighted standard deviation of the volume heating rate, which involves annular light illumination. The simulation analysis reveals that reducing the flux threshold and increasing the number of rays used have little impact on the accuracy of the calculation, but it significantly reduces operational efficiency. Besides, the simulation error is less than 5% when the off-axis of the annular light source on the Z-axis is under 0.1mm, and the error is less than 10% when the Z-axis off-axis is less than 0.2mm. The system parameters' influence rules on the cryotarget's infrared uniformity effect are summarized through multi-group simulation analysis, laying a foundation for the subsequent related ICF experiments.
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