激光直接驱动的聚变目标设计具有高Z梯度密度推进器外.
S X Hu1,2,3, L Ceurvorst1, J L Peebles1
1Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA.
Physical review. E
|October 18, 2023
概括
使用高Z梯度密度推进 (GDPS) 的新激光直接驱动的聚变目标显示出对抗不稳定性爆破的前景. 这些先进的设计可以实现显著的中子产量,即使有影响激光吸收的交叉光束能量转移效应.
科学领域:
- 核聚变能源是核聚变能源.
- 等离子体物理学的物理学
- 惯性封闭聚变 (ICF) 是一种
背景情况:
- 传统的惯性封闭融合 (ICF) 目标经常面临水力动力学不稳定的挑战.
- 交叉光束能量转移 (CBET) 可以显著降低激光吸收和ICF爆破中的消光压力.
- 在ICF中实现高能量增益需要强大的目标设计,以减轻不稳定的增长和能量损失.
研究的目的:
- 研究新型激光直接驱动的聚变目标设计,采用高Z梯度密度推进器外 (GDPS).
- 在包括CBET在内的各种模拟条件下,与传统目标相比,评估GDPS目标的性能.
- 确定关键的物理机制,使强大的点火和能量增益在GDPS爆炸.
主要方法:
- 一维 (1D) 和二维 (2D) 辐射-水力学模拟,分别使用lilac和draco代码.
- 用固体二三 (DT) 燃料,高Z GDPS 和金 (Au) 涂层泡层对目标进行建模.
- 对爆破特征的分析,如亚迪亚巴特,收比率,爆破速度和中子产量.
主要成果:
- 据GDPS的目标显示,抗不稳定性爆裂具有较高的亚酸盐 (α≥8) 和较低的融合比 (CRhs≈22,CRPS≈17).
- 1D模拟预测中子产量超过50MJ,激光能量为1.92.5MJ,尽管存在CBET效应.
- 2D模拟显示,GDPS目标使用CBET实现了410MJ的中子产量,而传统目标失败了;使用缓解CBET预计产量>20MJ.
结论:
- 与传统设计相比,GDPS目标具有显著的优势,可实现强大的点火和适度的能量增益.
- 关键因素包括保持高酸盐燃料状态,由于高Z层减少热点导热,以及潜在的辐射捕获.
- 这些发现表明,GDPS目标是有效的惯性封闭核聚变能源生产的有希望的途径.
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