辐射场非平衡性对CH薄膜烧蚀特性的影响
Influence of non-equilibrium radiation source on ablation-driven shock waves propagating in CH foil
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摘要: 为研究辐射场非平衡性对ICF内爆靶丸辐射烧蚀效果的影响，在普朗克谱的高频区（Au的M带）叠加高斯谱人为地构造辐射源的能谱，利用1维多群辐射输运流体力学程序RDMG模拟CH薄膜的烧蚀过程，考察烧蚀压、预热、压缩比、冲击波速度等物理量受辐射场非平衡性的影响。模拟结果表明，Au的M带辐射有明显的增强预热、减小冲击波压缩比的作用，从而间接地影响了烧蚀冲击波的速度。Abstract: In indirect-driven inertial confinement fusion(ICF), the hohlraum’s non-equilibrium radiation field brings an unneglectable impact to the ablation process of the capsule’s ablator materials(CH, e.g.). In this paper, an artificial spectrum of the hohlraum’s radiation field is fabricated by combining the Planckian spectrum with a Gaussian spectrum near Au M-band. A CH foil ablated by such a radiation source is simulated, and the influence of non-equilibrium radiation field on physical quantities (ablation pressure, preheating, compression ratio, shock velocity,etc)of the ablation process is studied, using a 1D radiation hydrodynamics code RDMG with discrete ordinate approximation(Sn). The simulation results show that the Au M-band radiation in the hohlraum remarkably increases the preheat
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Key words:
- inertial confinement fusion /
- non-equilibrium radiation field /
- ch foil /
- au m-band radiation /
- ablation /
- shock wave
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