在惯性封闭融合中减少混合与早期接口加速
C R Weber1, D S Clark1, D T Casey1
1Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA.
Physical review. E
|September 19, 2023
概括
惯性封闭融合 (ICF) 涉及的不稳定性可能会阻碍燃料压缩. 一个特定的加速场景可以稳定这些不稳定性,改善融合性能并减少燃料污染.
科学领域:
- 等离子体物理学的物理学
- 核聚变工程 核聚变工程
- 流体动力学 流体动力学
背景情况:
- 惯性封闭聚变 (ICF) 依赖于压缩燃料来启动聚变反应.
- 燃料消耗器接口的不稳定性,特别是里希特迈尔-梅什科夫 (RM) 和雷利-泰勒 (RT) 不稳定性,可以通过降低压缩和允许消耗器材料与燃料混合来降低爆破性能.
- 了解和减轻这些不稳定性对于实现高效的核聚变燃烧至关重要.
研究的目的:
- 调查加速方向在ICF爆发中燃料消耗器接口的不稳定性增长中的作用.
- 探索如何特定的不稳定性动态,特别是负阿特伍德数条件下的RT不稳定性的振荡运动,可以抑制RM不稳定性的增长.
- 为设计先进的ICF目标提供信息,利用这些稳定效应改善压缩和减少混合.
主要方法:
- 在ICF条件下对流体不稳定的理论分析.
- 电脑模拟ICF爆炸,包括RM和RT不稳定性的演变.
- 模拟结果与国家点火设施 (NIF) 的实验数据进行比较.
主要成果:
- 该研究证实,在负的阿特伍德数条件下,雷利-泰勒 (RT) 不稳定性可以诱导振荡运动.
- 这种振荡运动对燃料消耗器界面的里希特迈尔-梅什科夫 (RM) 不稳定性的增长产生稳定作用.
- 模拟和理论模型表明,这种稳定场景发生在早期的NIF实验中,解释了对1D模型的增强性能.
结论:
- 对于ICF性能来说,RT和RM不稳定的相互作用至关重要.
- 利用负的阿特伍德数加速模式为增强燃料压缩和最大限度地减少消化器污染提供了一条途径.
- 这种理解正在纳入下一代,较低的adiabat ICF设计,以提高核聚变能源产量.
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