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arXiv 1507.04594physics.plasm-phphysics.acc-ph
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由Laser驱动的Z箍缩产生的加速离子

Accelerated Ions from a Laser Driven Z-pinch

Michael H. Helle, Daniel F. Gordon, Dmitri Kaganovich, Yu-hsin Chen, John P. Palastro, Antonio Ting

摘要:

由于以光速移动的激光脉冲和缓慢移动的大质量离子之间的速度失配,离子的强激光加速本质上是困难的。目前的方法不是直接加速离子,而是依赖于TV/m激光场来激发和驱逐电子。然后离子被电荷分离产生的静电场加速。在这里,我们报告的实验和数值加速离子的激光驱动Z箍缩退出尖锐的等离子体界面。这是通过首先驱动等离子体尾场在自调制气泡制度。产生冷返回电流以保持等离子体的准中性。相反方向的电流相互排斥,形成轴向快电流和圆柱壳冷回流,两者之间有一个大的(100 MG)方位磁场。这些条件产生Z箍缩,其压缩轴上的快速电子和离子。如果这个过程在尖锐的等离子体界面处终止,则随着Z箍缩的崩溃,离子束在向前的方向上被加速。这些结果提供了一个新的途径,激光加速离子以及潜在的实验室规模的模拟z箍缩的天体物理事件。

英文摘要:

Intense laser acceleration of ions is inherently difficult due to the velocity mismatch between laser pulses moving at the speed of light and slowly moving massive ions. Instead of directly accelerating the ions, current approaches rely on TV/m laser fields to ionize and drive out electrons. The ions are then accelerated by the resulting electrostatic fields from charge separation. Here we report experimental and numerical acceleration of ions by means of laser driven Z-pinch exiting a sharp plasma interface. This is achieved by first driving a plasma wakefield in the self-modulated bubble regime. Cold return currents are generated to maintain quasi-neutrality of the plasma. The opposite current repel and form an axial fast current and a cylindrical-shell cold return current with a large (100 MG) azithmuthal field in between. These conditions produce a Z-pinch that compresses the fast electrons and ions on axis. If this process is terminated at a sharp plasma interface, a beam of ions are then accelerated in the forward direction as the Z-pinch collapses. These results provide a new route towards laser-accelerated ions as well as potential laboratory scale modeling of z-pinches in astrophysical events.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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