论文标题
自构磁场在惯性融合点火阈值中的作用
Role of self-generated magnetic fields in the inertial fusion ignition threshold
论文作者
论文摘要
磁场自发生长在惯性限制融合内爆的热点不对称的不稳定界面上。尽管难以衡量，但在当前国家点火设施实验中，理论考虑和数值模拟预测了超过5KT的现场强度。然后，电子的磁性限制将热点热损失降低> 5％。我们通过在爆炸时间对二维Xrage流体动力模拟数据的磁后处理来证明这一点。然后，我们得出一个自磁化模型，发现它随停滞温度的平方而变化，并且随着面积的密度成反。然后，自磁化的Lawson分析给出了点火阈值略有降低。时间依赖的热点能量平衡模型证实了这一发现，磁场将接近阈值参数的融合产量四倍。包括磁化多维流体不稳定性可能会进一步改变点火阈值，并将成为未来工作的主题。
Magnetic fields spontaneously grow at unstable interfaces around hot-spot asymmetries during inertial confinement fusion implosions. Although difficult to measure, theoretical considerations and numerical simulations predict field strengths exceeding 5kT in current national ignition facility experiments. Magnetic confinement of electrons then reduces the hot-spot heat loss by >5%. We demonstrate this via magnetic post-processing of two-dimensional xRAGE hydrodynamic simulation data at bang time. We then derive a model for the self-magnetization, finding that it varies with the square of the stagnation temperature and inversely with the areal density. The self-magnetized Lawson analysis then gives a slightly reduced ignition threshold. Time dependent hot-spot energy balance models corroborate this finding, with the magnetic field quadrupling the fusion yield for near threshold parameters. The inclusion of magnetized multi-dimensional fluid instabilities could further alter the ignition threshold, and will be the subject of future work.
