Surface-magnetic-field and fast-electron current-layer formation by ultraintense laser irradiation.
Surface-magnetic-field and fast-electron current-layer formation by ultraintense laser irradiation.
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DOI：
10.1103/physrevlett.93.265002
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发表时间：
2004-12
影响因子：
8.6
通讯作者：
Tatsufumi Nakamura;S. Kato;H. Nagatomo;K. Mima
中科院分区：
文献类型：
--
作者：
Tatsufumi Nakamura;S. Kato;H. Nagatomo;K. Mima
利用超强激光脉冲产生多MeV电子在快点火激光聚变及相关高能量密度科学中起着重要作用。这封信揭示了相对论电子运动和自感电磁场的一个独特特征，它依赖于激光入射角和强度。当入射角大于临界值（θ>或= θ cr）时，尽管MeV电子斜入射到靶中，高能电子仍与等离子体块体解耦，并由表面准静态电磁场引导的结构化电子运动沿表面沿着输运.表面电磁场和快电子密度和电流分布维持在一个准稳态的强激光照射。场和电子密度的解析结构与2D粒子模拟结果相当吻合。
Multi-MeV electron generation by ultraintense laser pulses plays a major role in fast ignition laser fusion and related high energy density science. This Letter discloses a unique feature of relativistic electron motion and self-induced electromagnetic fields which depend upon laser incident angle and intensity. When the incident angle is larger than the critical value (theta> or =thetacr), despite an MeV electron being injected obliquely into the target, the high energy electron is decoupled from the bulk of the plasma and transported along the surface by the structured electron motion guided by the surface quasistatic electromagnetic field. The surface electromagnetic field and fast-electron density and current profiles are sustained as a quasisteady state by the intense laser irradiation. The analytical structures of the field and electron density agree reasonably well with 2D particle in cell simulation results.