Investigations of ultrafast charge dynamics in laser-irradiated targets by a self probing technique employing laser driven protons
Investigations of ultrafast charge dynamics in laser-irradiated targets by a self probing technique employing laser driven protons
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DOI：
10.1016/j.nima.2016.04.078
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发表时间：
2016-09-01
影响因子：
1.4
通讯作者：
Borghesi, M.
中科院分区：
文献类型：
--
作者：
Ahmed, H.;Kar, S.;Borghesi, M.
目标正常鞘层加速机制产生的发散和宽带质子束提供了独特的机会，在点投影成像方案中，探测激光等离子体相互作用过程中产生的瞬态电场和磁场的动力学。通常这样的实验装置需要两束强激光束，其中一束产生的相互作用被另一束产生的质子探测。我们在此介绍了通过采用自质子探测装置，即通过将导线连接到产生探测质子的目标上，沿着与激光照射目标相连的导线进行的超快电荷动力学的实验研究。实验数据表明，携带大量电荷的电磁脉冲沿导线发射，以10s ps的统一脉冲以接近光速的速度传播。讨论了这种特殊类型的质子探测技术的实验能力和分析方法。(C) 2016 Elsevier B.V.版权所有
The divergent and broadband proton beams produced by the target normal sheath acceleration mechanism provide the unique opportunity to probe, in a point-projection imaging scheme, the dynamics of the transient electric and magnetic fields produced during laser-plasma interactions. Commonly such experimental setup entails two intense laser beams, where the interaction produced by one beam is probed with the protons produced by the second. We present here experimental studies of the ultra-fast charge dynamics along a wire connected to laser irradiated target carried out by employing a 'self proton probing arrangement i.e. by connecting the wire to the target generating the probe protons. The experimental data shows that an electromagnetic pulse carrying a significant amount of charge is launched along the wire, which travels as a unified pulse of 10s of ps duration with a velocity close to speed of light. The experimental capabilities and the analysis procedure of this specific type of proton probing technique are discussed. (C) 2016 Elsevier B.V. All rights reserved.