Energy gain of wetted-foam implosions with auxiliary heating for inertial fusion studies
Energy gain of wetted-foam implosions with auxiliary heating for inertial fusion studies
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DOI：
10.1088/1361-6587/ad15ee
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发表时间：
2024-02-01
影响因子：
2.2
通讯作者：
Norreys，P. A.
中科院分区：
文献类型：
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作者：
Paddock，R. W.;Li，T. S.;Norreys，P. A.
低收敛比内爆（使用湿泡沫层来限制胶囊收敛，从而提高对不稳定性增长的鲁棒性）和辅助加热（使用电子束来提供热点的无碰撞加热）是两种有前途的技术，正在探索用于惯性聚变能的应用。本文提出了一种新的分析方法来理解和预测这些内爆的性能。首先，利用传统的增益模型生成固定收敛比的增益曲线，可以很好地描述先前的模拟结果。其次，通过氘-氚燃料的燃烧分数可以很好地理解和解释辅助加热，燃烧相对于燃烧平均温度的梯度可以很好地定性预测该技术对给定内爆的有效性。对一系列内爆的辅助加热进行了模拟以支持这一点，并证明这种加热对高增益内爆有显著的好处，当燃烧平均温度在5到20 keV之间时最有效。
Low convergence ratio implosions (where wetted-foam layers are used to limit capsule convergence, achieving improved robustness to instability growth) and auxiliary heating (where electron beams are used to provide collisionless heating of a hotspot) are two promising techniques that are being explored for inertial fusion energy applications. In this paper, a new analytic study is presented to understand and predict the performance of these implosions. Firstly, conventional gain models are adapted to produce gain curves for fixed convergence ratios, which are shown to well-describe previously simulated results. Secondly, auxiliary heating is demonstrated to be well understood and interpreted through the burn-up fraction of the deuterium-tritium fuel, with the gradient of burn-up with respect to burn-averaged temperature shown to provide good qualitative predictions of the effectiveness of this technique for a given implosion. Simulations of auxiliary heating for a range of implosions are presented in support of this and demonstrate that this heating can have significant benefit for high gain implosions, being most effective when the burn-averaged temperature is between 5 and 20 keV.