Path to Increasing p-B11 Reactivity via ps and ns Lasers
Path to Increasing p-B11 Reactivity via ps and ns Lasers
复制标题
通过 ps 和 ns 激光器提高 p-B11 反应性的途径
DOI：
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
S. Hu
中科院分区：
文献类型：
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作者：
T. Mehlhorn;L. Labun;B. Hegelich;D. Margarone;M. Gu;D. Batani;E. Campbell;S. Hu
质子-硼（p-11 B）热核聚变的劳森判据比氘-氚（DT）的劳森判据高得多，因为聚变截面较低，在较高的离子能量处达到峰值。麦克斯韦平均p-11B反应性峰值在几百千电子伏，韧致辐射发射可能占主导地位的聚变反应，如果电子和离子处于热平衡和损失是不受限制的。非平衡燃烧经常被认为是实现这种非中子反应的好处，但弹性散射超过聚变反应性的优势使得这很难实现。超短脉冲激光器的发展为引发非平衡热核燃烧开辟了新的可能性，并从几个实验中报道了大量的p-11B α粒子。我们提出了一个分析，表明这些显着的α产率是不缩放到净能量增益的束聚变反应的结果。我们进一步发现，产量可以解释的实验参数和最近更新的横截面，假设的雪崩机制是不需要的。我们使用这种分析来了解USPL驱动的非平衡聚变反应的基本物理，以及它们是否可以用来启动聚变燃烧。最后，我们概述了提高p-11B反应性以实现点火目标的途径，并描述了我们将用于开发计算点设计的设计原则。
The Lawson criterion for proton-boron (p-11B) thermonuclear fusion is substantially higher than that for deuterium-tritium (DT) because the fusion cross section is lower and peaks at higher ion energies. The Maxwellian averaged p-11B reactivity peaks at several hundred keV, where bremsstrahlung radiation emission may dominate over fusion reactions if electrons and ions are in thermal equilibrium and the losses are unrestricted. Nonequilibrium burn has often been suggested to realize the benefits of this aneutronic reaction, but the predominance of elastic scattering over fusion reactivity makes this difficult to achieve. The development of ultrashort pulse lasers (USPL) has opened new possibilities for initiating nonequilibrium thermonuclear burns and significant numbers of p-11B alpha particles have been reported from several experiments. We present an analysis that shows that these significant alpha yields are the result of beam fusion reactions that do not scale to net energy gain. We further find that the yields can be explained by experimental parameters and recently updated cross sections such that a postulated avalanche mechanism is not required. We use this analysis to understand the underlying physics of USPL-driven nonequilibrium fusion reactions and whether they can be used to initiate fusion burns. We conclude by outlining a path to increasing the p-11B reactivity towards the goal of achieving ignition and describing the design principles that we will use to develop a computational point design.
光子和中子产生作为质子-硼聚变的原位诊断
影响因子：
0.9
作者：
Hegelich, B. M.;Labun, L.;Labun, O. Z.;Mehlhorn, T. A.
通讯作者：
Mehlhorn, T. A.