Perturbation modifications by pre-magnetisation of inertial confinement fusion implosions
Perturbation modifications by pre-magnetisation of inertial confinement fusion implosions
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DOI：
10.1063/1.5085498
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发表时间：
2019-02
影响因子：
2.2
通讯作者：
C. Walsh;K. McGlinchey;J. Tong;B. Appelbe;A. Crilly;M. Zhang;J. Chittenden
中科院分区：
文献类型：
--
作者：
C. Walsh;K. McGlinchey;J. Tong;B. Appelbe;A. Crilly;M. Zhang;J. Chittenden
国家点火设施上惯性约束聚变内爆的预磁化有可能将当前的高性能目标提升到点火状态[Perkins et al."The potential of imposed magnetic fields for enhancing ignition probability and fusion energy yield in indirect-drive inertial confinement fusion，" Phys. Plasmas 24，062708（2017）]。这种方法的一个关键问题是磁场的应用固有地增加了不对称性。本文使用3-D扩展磁流体动力学Gorgon模拟研究热传导抑制，洛伦兹力和α粒子磁化如何影响三种热点扰动场景：冷燃料尖峰，时间依赖的辐射驱动不对称性和多模扰动。对于中等磁化（B0 = 5 T），单穗穿透更深的热点，热烧蚀稳定减少。然而，在较高的磁化强度（B0 = 50 T），磁张力的作用，以稳定尖峰。虽然α粒子轨道的磁化增加了峰值热点温度，但没有观察到对扰动穿透深度的影响。P4主导的辐射驱动不对称性表明了热烧蚀稳定修改的各向异性性质，垂直于磁场的扰动穿透更深，平行于磁场的扰动优先通过增加热流来稳定。适度的磁化也增加了流行的高模式，而磁张力减少了较大的磁化热点边缘的涡度。对于一个模拟的高脚实验，通过施加50 T的磁场，产量增加了一倍--对于性能更高的配置，预计这种放大会更大。在国家点火装置上对惯性约束聚变内爆进行预磁化，有可能将目前的高性能靶提高到点火状态[Perkins等人，在间接驱动惯性约束聚变中，施加磁场提高点火概率和聚变能量产率的潜力，"物理等离子体24，062708（2017）]。这种方法的一个关键问题是磁场的应用固有地增加了不对称性。本文使用3-D扩展磁流体动力学Gorgon模拟研究热传导抑制，洛伦兹力和α粒子磁化如何影响三种热点扰动场景：冷燃料尖峰，时间依赖的辐射驱动不对称性和多模扰动。对于中等磁化强度（B0 = 5 T），单个尖峰穿透更深的热点，热烧蚀穿刺。
Pre-magnetisation of inertial confinement fusion implosions on the National Ignition Facility has the potential to raise current high-performing targets into the ignition regime [Perkins et al. “The potential of imposed magnetic fields for enhancing ignition probability and fusion energy yield in indirect-drive inertial confinement fusion,” Phys. Plasmas 24, 062708 (2017)]. A key concern with this method is that the application of a magnetic field inherently increases asymmetry. This paper uses 3-D extended-magnetohydrodynamics Gorgon simulations to investigate how thermal conduction suppression, the Lorentz force, and α-particle magnetisation affect three hot-spot perturbation scenarios: a cold fuel spike, a time-dependent radiation drive asymmetry, and a multi-mode perturbation. For moderate magnetisations (B0 = 5 T), the single spike penetrates deeper into the hot-spot, as thermal ablative stabilisation is reduced. However, at higher magnetisations (B0 = 50 T), magnetic tension acts to stabilise the spike. While magnetisation of α-particle orbits increases the peak hot-spot temperature, no impact on the perturbation penetration depth is observed. The P4-dominated radiation drive asymmetry demonstrates the anisotropic nature of the thermal ablative stabilisation modifications, with perturbations perpendicular to the magnetic field penetrating deeper and perturbations parallel to the field being preferentially stabilised by increased heat-flows. Moderate magnetisations also increase the prevalence of high modes, while magnetic tension reduces vorticity at the hot-spot edge for larger magnetisations. For a simulated high-foot experiment, the yield doubles through the application of a 50 T magnetic field-an amplification which is expected to be larger for higher-performing configurations.Pre-magnetisation of inertial confinement fusion implosions on the National Ignition Facility has the potential to raise current high-performing targets into the ignition regime [Perkins et al. “The potential of imposed magnetic fields for enhancing ignition probability and fusion energy yield in indirect-drive inertial confinement fusion,” Phys. Plasmas 24, 062708 (2017)]. A key concern with this method is that the application of a magnetic field inherently increases asymmetry. This paper uses 3-D extended-magnetohydrodynamics Gorgon simulations to investigate how thermal conduction suppression, the Lorentz force, and α-particle magnetisation affect three hot-spot perturbation scenarios: a cold fuel spike, a time-dependent radiation drive asymmetry, and a multi-mode perturbation. For moderate magnetisations (B0 = 5 T), the single spike penetrates deeper into the hot-spot, as thermal ablative stab...