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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。
The laser target coupling process in the ICF context generates a large number of electromagnetic pulses, which have an adverse effect on the normal operation of the diagnostic equipment and the collection of test data, and even damage the diagnostic device in severe cases. The mathematical model of plasma generated by stimulated radiation during the interaction between strong laser and metal target is introduced. The physical model and three-dimensional gain of the pulse cone antenna are simulated and the target process is measured. The electromagnetic field Value, and derive its frequency domain distribution. The experimental results show that the factors that affect the intensity of electromagnetic radiation include laser energy, laser shooting mode and incident direction. For planar targets, the same target and the target material, the electromagnetic pulses emitted by different power laser interacting with planar targets have similar spectrum and the same characteristic frequency. The diagnostic results provide important experimental evidence for the physical mechanism of electromagnetic pulse generated by laser shooting.