冷冻靶校准误差和烧蚀层粗糙度对氘氚层均匀性的影响
Effects of cryogenic target misalignment and capsule nonuniformity on deuterium-tritium layer uniformity
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摘要: 理论分析了氘氚层外表面的温差与其粗糙度间的关系；以法国兆焦激光装置LMJ为原型，利用计算流体力学程序Fluent，分别模拟了靶丸轴向偏离黑腔中心不同尺度和烧蚀层存在不同大小的非均匀厚度对氘氚层温度分布的影响，求得了这两种误差引起氘氚层厚度的非均匀度。结果表明：为了满足点火靶的要求，靶丸轴向偏离腔体中心的尺度须在8.5 μm内，烧蚀层轴向粗糙度则应控制在0.72 μm内。Abstract: The interrelation between the temperature difference of the deuterium and tritium(DT) outer surface and roughness of the DT layer has been obtained in theory for the indirect drive targets of inertial confinement fusion. Taking the Laser Magajoule(LMJ) as a prototype, the effects of target misalignment from the center of the hohlraum on the axial axis and the nonuniformity of the capsule on the DT layer temperature profiles have been simulated with a CFD code (Fluent). Then, the thickness nonuniformities of the DT layer have been calculated with the theoretical expression. The results show that in order to satisfy the requirement of ignition, the target misalignment must be less than 8.5 μm, and the RMS roughness of the capsule should be controlled in 0.72 μm.
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Key words:
- icf /
- indirect drive target /
- cryogenic target /
- deuterium-tritium layer /
- roughness /
- uniformity /
- axial misalignment
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