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arXiv 2004.07726physics.plasm-phphysics.flu-dyn
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惯性约束聚变燃料成分梯度产生的磁场

Magnetic field generation from composition gradients in inertial confinement fusion fuel

James D. Sadler, Hui Li, Kirk A. Flippo

摘要:

聚变内爆的实验不对称性会导致热等离子体核心产生磁场。对于典型的参数,以前的研究发现,磁化霍尔参数,给出的产品的电子回旋频率和库仑碰撞时间,可以超过一个。这将通过电子热通量的抑制和偏转来影响流体动力学。磁场源是无碰撞的比尔曼项,它产生于电子压力梯度中的德拜屏蔽势。我们表明,有一个额外的源项,由于库仑碰撞算子的Z依赖性。如果存在离子成分梯度,例如碳烧蚀剂混合物的射流进入热点,则该源项可以迅速超过比尔曼场。此外,由于碳辐射冷却的温度梯度增加,比尔曼场增强。通过更强的自生场,碳区域的热损失将减少,从而潜在地减少碳混合的负面影响。

英文摘要:

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.

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