论文标题
从惯性限制融合燃料中的组成梯度产生磁场
Magnetic field generation from composition gradients in inertial confinement fusion fuel
论文作者
论文摘要
融合内爆的实验不对称可能会导致热等离子体芯中的磁场产生。对于典型的参数，先前的研究发现，由电子陀螺频率和库仑碰撞时间的乘积给出的磁化厅参数可能超过一个。这将通过抑制和偏转电子热通量影响流体动力学。磁场源是无碰撞的Biermann项，它是由电子压力梯度中的Debye屏蔽潜力引起的。我们表明，由于库仑碰撞运算符的Z依赖性，还有一个额外的源术语。如果有离子组成梯度，例如进入热点的碳散热器混合物，则该源术语可以迅速超过Biermann场。另外，由于碳辐射冷却的温度梯度升高，Biermann场得到了增强。随着更强的自我生成场，将减少碳区域的热量损失，从而有可能降低碳混合物的负面影响。
Experimental asymmetries in fusion implosions can lead to magnetic field generation in the hot plasma core. For typical parameters, previous studies found that the magnetisation Hall parameter, given by the product of the electron gyro-frequency and Coulomb collision time, can exceed one. This will affect the hydrodynamics through inhibition and deflection of the electron heat flux. The magnetic field source is the collisionless Biermann term, which arises from the Debye shielding potential in electron pressure gradients. We show that there is an additional source term due to the Z dependence of the Coulomb collision operator. If there are ion composition gradients, such as jets of carbon ablator mix entering the hot-spot, this source term can rapidly exceed the Biermann fields. In addition, the Biermann fields are enhanced due to the increased temperature gradients from carbon radiative cooling. With even stronger self-generated fields, heat loss to the carbon regions will be reduced, potentially reducing the negative effect of carbon mix.
