Relativistic Buneman instability in the laser breakout afterburner
Relativistic Buneman instability in the laser breakout afterburner
复制标题
DOI：
10.1063/1.2768933
复制
发表时间：
2007-09-01
影响因子：
2.2
通讯作者：
Fernandez, J. C.
中科院分区：
文献类型：
--
作者：
Albright, B. J.;Yin, L.;Fernandez, J. C.
在具有非常薄（10 s nm）固体目标的高对比度超强激光器的粒子内模拟中，已经确定了一种新的激光驱动离子加速机制 [Yin , Laser and Particle Beams 24, 291 (2006);尹物理。等离子 13, 072701 (2007)]。经过短暂的目标正常鞘加速度 (TNSA) 后，“增强”TNSA 随之而来。在此阶段，当目标厚度变得与趋肤深度相当时，激光快速加热目标中的所有电子，并增强离子的加速。然后，伴随着激光穿透目标，产生与离子共同移动的大加速纵向电场。最后一个阶段被称为激光“突破加力”（BOA）。早期的研究表明，BOA 与布内曼不稳定性有关，布内曼不稳定性能有效地将电子漂移产生的能量转化为离子。在这篇简短的通讯中，我们发现这个猜想与细胞内粒子模拟数据和相对论布尼曼不稳定性的解析色散关系是一致的。 (C) 2007 年美国物理研究所。
A new laser-driven ion acceleration mechanism has been identified in particle-in-cell simulations of high-contrast-ratio ultraintense lasers with very thin (10 s of nm) solid targets [Yin , Laser and Particle Beams 24, 291 (2006); Yin , Phys. Plasmas 13, 072701 (2007)]. After a brief period of target normal sheath acceleration (TNSA), "enhanced" TNSA follows. In this stage, the laser rapidly heats all the electrons in the target as the target thickness becomes comparable to the skin depth and enhanced acceleration of the ions results. Then, concomitant with the laser penetrating the target, a large accelerating longitudinal electric field is generated that co-moves with the ions. This last phase has been termed the laser "breakout afterburner" (BOA). Earlier work suggested that the BOA was associated with the Buneman instability that efficiently converts energy from the drift of the electrons into the ions. In this Brief Communication, this conjecture is found to be consistent with particle-in-cell simulation data and the analytic dispersion relation for the relativistic Buneman instability. (C) 2007 American Institute of Physics.