Author Affiliations
Abstract
1 School of Energy Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2 Laser Fusion Research Center, Chinese Academy of Engineering Physics, Mianyang 621900, China
Intensive electromagnetic pulses (EMPs) can be generated from interaction of the ultra-intense lasers and solid targets in inertial confinement fusion (ICF), which will detrimentally affect the data acquisition from some electric components. A diagnostic system for EMP measurement inside and outside the ShenGuang-III facility is designed and fabricated in this study. The experimental results indicate that the peak magnitude of EMP reaches up to 3210.7 kV/m and 6.02 T. The received signals depend most on the antenna and target types. The half-hohlraum generates a more intensive EMP radiation than that from the other targets, and the large planar and medium discone capture much stronger signals than the other antennas. In addition, the mechanisms of EMP generation from different targets are discussed. The resulting conclusion are expected to provide the experimental basis for further EMP shielding design.
140.3320 Laser cooling 140.3538 Lasers, pulsed 350.5610 Radiation Chinese Optics Letters
2016, 14(10): 101402
1 电子科技大学能源科学与工程学院, 四川 成都 611731
2 中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
通过脉冲接收天线的设计和测试方法的优化，建立了神光Ⅲ原型激光器电磁脉冲(EMP)的强度分布等激光参数和靶型的关系，为进一步研究它们的产生机理和激光靶相互作用提供实验依据。考虑到电磁场极化方向的不确定性，使用三个相互正交的环形磁天线对激光装置靶室内部的电磁脉冲信号进行了测量，对比分析了两种靶型辐射电磁脉冲信号的频域特性，探讨了天线摆放位置对信号强度的影响，同时通过多物理场模拟对球形腔内电磁场的分布进行了分析。
激光技术 电磁脉冲 天线 模拟
1 电子科技大学 能源科学与工程学院, 成都 611731
2 中国工程物理研究院 激光聚变研究中心, 四川 绵阳 621900
为诊断激光打靶产生的电磁脉冲信号分布,选取环天线作为主要电磁脉冲信号采集装置,对靶室内外信号同时进行测试。从天线设计制作到天线标定,描述了脉冲诊断系统的搭建。通过对信号进行采集及处理,对比分析了靶室外、法兰口及靶室内脉冲信号的频域特性和强度。得出靶室内受到电磁脉冲辐射强度最大且频谱分布最广,其次是法兰口,靶室外电磁脉冲信号最弱。总结多次激光打靶电磁脉冲信号频域分布,可看出波峰主要出现在0.5,1.2,3 GHz。电磁脉冲时域结果规律性展示出脉冲持续约100 ns,因靶室内回波振荡,电磁脉冲信号于几ns处及几十ns处有较明显峰值蔟。
惯性约束聚变 激光靶耦合 电磁脉冲 靶室内外 inertial confinement fusion laser target coupling electromagnetic pulse outside and inside the target chamber 强激光与粒子束
2015, 27(10): 103224
