A thermodynamic condition for ignition and burn-propagation in cryogenic layer inertially confined fusion implosions
A thermodynamic condition for ignition and burn-propagation in cryogenic layer inertially confined fusion implosions
复制标题
低温层惯性约束聚变内爆点火和燃烧传播的热力学条件
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
R. Betti
中科院分区：
文献类型：
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作者：
O. Hurricane;S. Maclaren;M. Rosen;J. Hammer;P. Springer;R. Betti
开发了动态内爆中类似于劳森的点火准则（其中自加热主导所有能量损失），该准则解释了内爆 X 射线限制质量的不对称性和差异。结果表明，热力学点火条件相当于产量放大水平 16-32。由于停滞后膨胀的负 pdV 功增加的能量损失高于 X 射线和电子传导损失，因此类劳森点火准则是必要的，但不足以点燃热点以足够的活力传播到 DT 燃料中以产生高增益。类劳森准则的更高维概括，包括拆卸时内爆的冷却，确实提供了所需的准则，并且它表明，与传统点火指标所暗示的相比，非常高水平的产量放大需要显着更高的温度。
A Lawson-like criterion for ignition (where self-heating dominates over all energy losses) in a dynamic implosion is developed, which accounts for asymmetry and for differences in an implosion x-ray confinement quality. It is shown that the thermodynamic ignition condition is equivalent to yield amplification levels of 16–32. Since negative pdV work of expansion after stagnation increases energy losses above that of x-ray and electron-conduction losses, the Lawson-like ignition criterion is necessary but not sufficient for igniting the hot spot to propagate into the DT fuel with sufficient vigor to generate high gain. A higher dimensional generalization of the Lawson-like criterion, which includes the cooling of the implosion upon disassembly, does provide the needed criteria, and it shows that significantly higher temperature is needed for very high levels of yield amplification compared to what traditional ignition metrics imply.