强横向磁场约束下laser -等离子体产生的增强X射线辐射
Enhanced x-ray emission arising from laser-plasma confinement by a strong transverse magnetic field
摘要：
我们分析，使用实验和三维MHD数值模拟，等离子体的动力学和辐射特性的激光烧蚀（1 ns，10 $^{12}$-10 $^{13}$ W/cm $^2$）从固体靶，因为它扩展到一个均匀的，强磁场（高达30 T）横向于其主膨胀轴。我们发现，只要2 ns后开始的膨胀，等离子体成为约束的磁场。随着磁场强度的增加，更多的等离子体被限制在靶附近并通过磁压缩被加热。我们还观察到一个致密的平板，在~ 8 ns后迅速膨胀到真空中;然而，这个平板只包含总等离子体的~ 2%。由于受限等离子体的较高密度和增加的加热，存在由磁化引起的总X射线发射率的净增强。
英文摘要：
We analyze, using experiments and 3D MHD numerical simulations, the dynamics and radiative properties of a plasma ablated by a laser (1 ns, 10$^{12}$-10$^{13}$ W/cm$^2$) from a solid target, as it expands into a homogeneous, strong magnetic field (up to 30 T) transverse to its main expansion axis. We find that as soon as 2 ns after the start of the expansion, the plasma becomes constrained by the magnetic field. As the magnetic field strength is increased, more plasma is confined close to the target and is heated by magnetic compression. We also observe a dense slab that rapidly expands into vacuum after ~ 8 ns; however, this slab contains only ~ 2 % of the total plasma. As a result of the higher density and increased heating of the confined plasma, there is a net enhancement of the total x-ray emissivity induced by the magnetization.
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