Author Affiliations
Abstract
1 School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, People’s Republic of China
2 Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, People’s Republic of China
3 Science and Technology on Plasma Physics Laboratory, Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, People’s Republic of China
4 Institute of Applied Physics and Computational Mathematics, Beijing, 100094, People’s Republic of China
5 HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871, People’s Republic of China
6 IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
7 Graduate School, China Academy of Engineering Physics, P.O. Box 2101, Beijing 100088, People’s Republic of China
Powerful lasers interacting with solid targets can generate intense electromagnetic pulses (EMPs). In this study, EMPs produced by a pulsed laser (1 ps, 100 J) shooting at CH targets doped with different titanium (Ti) contents at the XG-III laser facility are measured and analyzed. The results demonstrate that the intensity of EMPs first increases with Ti doping content from 1% to 7% and then decreases. The electron spectra show that EMP emission is closely related to the hot electrons ejected from the target surface, which is confirmed by an analysis based on the target–holder–ground equivalent antenna model. The conclusions of this study provide a new approach to achieve tunable EMP radiation by adjusting the metal content of solid targets, and will also help in understanding the mechanism of EMP generation and ejection of hot electrons during laser coupling with targets.
Matter and Radiation at Extremes
2020, 5(1): 017401
易涛 1,*于瑞珍 1胡昕 1杨鸣 1,2[ ... ]刘慎业 1
作者单位
摘要
1 中国工程物理研究院 激光聚变研究中心,四川 绵阳 621999
2 电子科技大学 能源科学与工程学院,四川 成都 611731
X射线条纹相机是激光惯性约束聚变研究中的核心测量设备,用于捕获聚变反应中瞬态X射线发射。对X射线条纹相机在聚变反应中强电磁辐射下的可靠性进行研究,给出了X射线条纹相机的可靠性框图及结构,并对X射线条纹相机各功能单元进行可靠性分配,针对其故障进行了故障模式和影响分析(FMEA)。可靠性分析和FMEA显示,X射线条纹相机中变像管单元其可靠性分配值在各个分系统单元中最高,其故障能够引起严重故障和试验损失,是制约X射线条纹相机可靠性和稳定性的重要部件。通过对X射线条纹相机内各单元的可靠性以及故障模式分析,有助于研究人员开展有针对性的电磁辐射加固,提升相机在强电磁脉冲辐射环境中运行的可靠性。
X射线条纹相机 可靠性 强电磁辐射 X-ray streak camera reliability strong electromagnetic radiation 
太赫兹科学与电子信息学报
2018, 16(5): 845
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
作者单位
摘要
1 中国工程物理研究院激光聚变研究中心, 四川绵阳 621999
2 电子科技大学能源科学与工程学院, 四川成都 611731
实验测量了神光 -III原型装置上脉冲强激光与金属靶相互作用产生的电脉冲辐射, 电脉冲峰值梯度为 3 kV/m, 频谱范围大约在 50 MHz~2 GHz, 在 160 MHz等处有明显的特征峰, 信号持续时间大约 60 ns。本文研究表明电偶极辐射是打靶过程产生电磁脉冲信号的来源之一, 由理论模型计算得到频率为 160 MHz的特征峰, 并计算出探测点电场脉冲峰值梯度约为 2 kV/m, 辐射总功率约 105 W, 能量转换率约 10-6, 辐射功率近似正比于激光能量的 4/3次方, 可见激光能量越大, 功率密度越高, 电脉冲的辐射强度越大。大型激光装置上的激光与靶作用产生的电磁脉冲测量, 对大型激光装置产生的电磁辐射的防护有重要指导作用, 在等离子体诊断等领域也有潜在应用价值。
激光等离子体相互作用 电磁脉冲 天线 偶极辐射 laser-target interaction electromagnetic pulse antenna dipole radiation 
太赫兹科学与电子信息学报
2016, 14(6): 905
Author Affiliations
Abstract
1 Laser Fusion Research Center, Chinese Academy of Engineering Physics, Mianyang, 621900, China
2 School of Energy Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China
3 School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 611731, China
Emission of the electromagnetic pulses (EMP) due to laser-target interaction in laser facility had been evaluated using a cone antenna in this work. The microwave in frequencies ranging from several hundreds of MHz to 2 GHz was recorded when long-pulse lasers with several thousands of joules illuminated the solid targets, meanwhile the voltage signals from 1 V to 4 V were captured as functions of laser energy and backlight laser, where the corresponding electric field strengths were obtained by simulating the cone antenna in combination with conducting a mathematical process (Tiknohov Regularization with L curve). All the typical coupled voltage oscillations displayed multiple peaks and had duration of up to 80 ns before decaying into noise and mechanisms of the EMP generation was schematically interpreted in basis of the practical measuring environments. The resultant data were expected to offer basic know-how to achieve inertial confinement fusion.
Electromagnetic impulse laser voltage simulation decay 
Photonic Sensors
2016, 6(3): 249
杨鸣 1,*易涛 2杨进文 1,2王传珂 2[ ... ]丁永坤 2
作者单位
摘要
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 
中国激光
2016, 43(8): 0801009
作者单位
摘要
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
惯性约束聚变(ICF)背景下的激光靶耦合过程产生大量电磁脉冲, 对诊断设备的正常运行和测试数据的采集产生不良影响, 严重时甚至损害诊断装置。介绍了强激光与金属靶相互作用过程中受激辐射产生等离子体的数学模型, 模拟了盘锥脉冲天线的物理模型、三维增益等各项指标, 并对打靶过程进行测量, 得出电磁辐射电场值, 并推导出其频域分布。实验结果显示, 影响电磁辐射强度的因素有激光能量、激光打靶方式和入射方向等。对于平面靶, 相同靶型和靶材质情况下, 不同功率激光与平面靶相互作用发出的电磁脉冲具有相似的频谱和相同的特征频率。诊断结果为激光打靶产生电磁脉冲物理机制研究提供重要实验依据。
电磁脉冲 圆锥天线 电磁耦合 时域分布 频域分布 electromagnetic pulse conical antenna electromagnetic coupling time-domain distribution frequency-domain distribution 
红外与激光工程
2016, 45(6): 0606007
作者单位
摘要
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

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