热核烧伤治疗中的磁场输运
Magnetic Field Transport in Propagating Thermonuclear Burn
摘要：
惯性聚变方案中的高能量增益要求热核燃烧波从热燃料传播到冷燃料。我们考虑了当磁场与烧伤波正交时烧伤的传播问题。利用扩展的MHD模型和磁化的$α$能量输运方程，我们发现磁场可以通过抑制电子热传导和$α$粒子通量来降低燃烧传播速率。燃烧传播过程中的磁场传输受到竞争效应的影响：通过烧蚀冷燃料，磁场可以从冷区域平流到热区域，而能斯特和$α$粒子通量影响从热燃料到冷燃料的传输场。这些效应，加上由于燃烧而引起的温度升高，可以导致电子霍尔参数在燃烧前沿迅速增长。这导致在热燃料和冷燃料之间形成自绝缘层，其降低电子热导率和$α$传输，增加温度梯度并降低燃烧传播速率。
英文摘要：
High energy gain in inertial fusion schemes requires the propagation of a thermonuclear burn wave from hot to cold fuel. We consider the problem of burn propagation when a magnetic field is orthogonal to the burn wave. Using an extended-MHD model with a magnetized $α$ energy transport equation we find that the magnetic field can reduce the rate of burn propagation by suppressing electron thermal conduction and $α$ particle flux. Magnetic field transport during burn propagation is subject to competing effects: field can be advected from cold to hot regions by ablation of cold fuel, while the Nernst and $α$ particle flux effects transport field from hot to cold fuel. These effects, combined with the temperature increase due to burn, can cause the electron Hall parameter to grow rapidly at the burn front. This results in the formation of a self-insulating layer between hot and cold fuel that reduces electron thermal conductivity and $α$ transport, increases the temperature gradient and reduces the rate of burn propagation.
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