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Spin depolarization induced by self-generated magnetic fields during cylindrical implosions
Physical Review E ( IF 2.4 ) Pub Date : 2020-10-26 , DOI: 10.1103/physreve.102.043215
Ronghao Hu , Hao Zhou , Zhihao Tao , Meng Lv , Shiyang Zou , Yongkun Ding

Spin-polarized fuels are promising for inertial confinement fusion due to the enhanced fusion cross section. One significant concern of spin-polarized inertial confinement fusion is whether the nuclei polarization could survive in the implosions and contribute to ignitions. Here we present numerical simulation methods and results of spin dynamics of polarized deuterium-tritium fuels in strong self-generated magnetic fields during the implosions of dense cylindrical shells. The magnetic field generation and evolution is modeled with generalized Ohm's laws combined with hydrodynamic equations. The spin dynamics is investigated with a particle-tracking method, by solving the spin precession equations of tracked particles. Rayleigh-Taylor instabilities and Richtmyer-Meshkov instabilities are found to be the main cause of depolarization. Hydrodynamic instabilities lead to depolarization of nuclei near the hot-spot shell interface, and an asymmetric shock front leads to depolarization of nuclei inside a hot spot. Deuterium polarization is more stable than tritium polarization due to its smaller gyromagnetic ratio. Low-mode perturbations can lead to higher depolarization inside a hot spot than high-mode perturbations. In the multimode simulations, the modes around 16–32 are significant for hot-spot depolarization.

中文翻译:

圆柱内爆过程中自生磁场引起的自旋去极化

由于极化截面增大,自旋极化燃料有望用于惯性约束融合。自旋极化惯性约束聚变的一个重要问题是核极化是否可以在爆炸中幸存并有助于点火。在这里,我们介绍了数值模拟方法和极化氘-tri燃料在致密圆柱壳内爆期间在强自生磁场中的自旋动力学结果。利用广义欧姆定律和流体动力学方程对磁场的产生和演化进行建模。通过求解被跟踪粒子的自旋进动方程,使用粒子跟踪方法研究了自旋动力学。发现瑞利-泰勒不稳定性和里奇米尔-梅什科夫不稳定性是去极化的主要原因。流体动力学的不稳定性导致热点壳界面附近的核去极化,而不对称的激波锋导致热点内部核的去极化。氘极化比tri极化更稳定,因为它的旋磁比较小。与高模扰动相比,低模扰动可导致热点内部的去极化更高。在多模仿真中,大约16–32的模对于热点去极化非常重要。
更新日期:2020-10-30
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