强laser驱动微管内爆产生兆强磁场
Generation of megatesla magnetic fields by intense-laser-driven microtube implosions
摘要：
利用超强激光脉冲驱动微管内爆产生超稳磁场。由于激光产生的能量为兆电子伏的热电子，内壁表面的冷离子向中心轴内爆。通过预先注入千特斯拉量级的均匀磁场，洛伦兹力引起内爆离子和电子的拉莫尔回转运动。由于相对论性带电粒子围绕中心轴的集体运动，产生了几十nm大小的~ peta-ampere/cm 2的强自旋电流密度，产生兆级磁场。粒子模拟和一个简单的分析模型揭示了基本的物理和重要的缩放。这一概念有望在基础物理学的许多分支和磁磁场的应用方面开辟新的前沿。
英文摘要：
A microtube implosion driven by ultraintense laser pulses is used to produce ultrahigh magnetic fields. Due to the laser-produced hot electrons with energies of mega-electron volts, cold ions in the inner wall surface implode towards the central axis. By pre-seeding uniform magnetic fields on the kilotesla order, the Lorenz force induces the Larmor gyromotion of the imploding ions and electrons. Due to the resultant collective motion of relativistic charged particles around the central axis, strong spin current densities of ~ peta-ampere/cm2 are produced with a few tens of nm size, generating megatesla-order magnetic fields. The underlying physics and important scaling are revealed by particle simulations and a simple analytical model. The concept holds promise to open new frontiers in many branches of fundamental physics and applications in terms of ultrahigh magnetic fields.
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