A comprehensive alpha-heating model for inertial confinement fusion
A comprehensive alpha-heating model for inertial confinement fusion
复制标题
惯性约束聚变的综合阿尔法加热模型
DOI：
10.1063/1.4991405
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发表时间：
2018
影响因子：
2.2
通讯作者：
B. Spears
中科院分区：
文献类型：
--
作者：
A. Christopherson;R. Betti;A. Bose;J. Howard;K. Woo;E. Campbell;J. Sanz;B. Spears
开发了一个综合模型来研究惯性约束等离子体中的阿尔法加热。它描述了由可压缩壳限制的中心低密度热点的时间演化，该热点由聚变阿尔法加热，并由辐射和热损失冷却。该模型包括惯性约束聚变内爆的减速、停滞和燃烧阶段，并且对于 α 加热聚变产量放大 ≤10 倍的次点燃目标有效。辐射流体动力学模拟的结果用于导出模型的实际初始条件和无量纲参数。研究发现，爆炸前产生的大部分α能量（~90%）沉积在热点质量内，而一小部分（~10%）驱动质量从内壳表面烧蚀，其能量被回收回到热点。在轫致辐射发射中，约 40% 沉积在热点中，约 40% 通过壳层烧蚀而回收回到热点，约 20% 离开热点……
A comprehensive model is developed to study alpha-heating in inertially confined plasmas. It describes the time evolution of a central low-density hot spot confined by a compressible shell, heated by fusion alphas, and cooled by radiation and thermal losses. The model includes the deceleration, stagnation, and burn phases of inertial confinement fusion implosions, and is valid for sub-ignited targets with ≤10× amplification of the fusion yield from alpha-heating. The results of radiation-hydrodynamic simulations are used to derive realistic initial conditions and dimensionless parameters for the model. It is found that most of the alpha energy (∼90%) produced before bang time is deposited within the hot spot mass, while a small fraction (∼10%) drives mass ablation off the inner shell surface and its energy is recycled back into the hot spot. Of the bremsstrahlung radiation emission, ∼40% is deposited in the hot spot, ∼40% is recycled back in the hot spot by ablation off the shell, and ∼20% leaves the hot ...