EMP control and characterization on high-power laser systems
EMP control and characterization on high-power laser systems
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DOI：
10.1017/hpl.2018.21
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发表时间：
2018-05-21
影响因子：
4.8
通讯作者：
Neely, D.
中科院分区：
文献类型：
--
作者：
Bradford, P.;Woolsey, N. C.;Neely, D.
强激光与固体靶相互作用过程中产生的强电磁脉冲（EMP）会严重影响电学测量和设备性能。EMP辐射是由目标内部的热电子加速引起的，它产生从DC到太赫兹频率的宽频带辐射。随着我们进入一个高重复率、高强度激光器（如极光基础设施）的新时代，对EMP的进一步理解和控制至关重要。我们目前的VULCAN激光设施的最新数据，证明如何电磁脉冲可以容易和有效地减少。使用B点和D点探头测量一系列不同的目标和激光参数来实现EMP的表征。我们证明，目标茎几何形状、材料成分、测地线路径长度和箔表面积都可以在减少电磁脉冲方面发挥重要作用。电磁波和三维粒子在细胞模拟的组合被用来告知我们的结论茎几何形状对EMP的影响，提供了一个机会，与现有的电荷分离模型进行比较。
Giant electromagnetic pulses (EMP) generated during the interaction of high-power lasers with solid targets can seriously degrade electrical measurements and equipment. EMP emission is caused by the acceleration of hot electrons inside the target, which produce radiation across a wide band from DC to terahertz frequencies. Improved understanding and control of EMP is vital as we enter a new era of high repetition rate, high intensity lasers (e.g. the Extreme Light Infrastructure). We present recent data from the VULCAN laser facility that demonstrates how EMP can be readily and effectively reduced. Characterization of the EMP was achieved using B-dot and D-dot probes that took measurements for a range of different target and laser parameters. We demonstrate that target stalk geometry, material composition, geodesic path length and foil surface area can all play a significant role in the reduction of EMP. A combination of electromagnetic wave and 3D particle-in-cell simulations is used to inform our conclusions about the effects of stalk geometry on EMP, providing an opportunity for comparison with existing charge separation models.