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直接驱动惯性约束聚变中,高温烧蚀初始印记在压缩过程的不稳定性发展中起着重要作用.利用X射线针孔辅助点投影成像法,研究了不同波形激光脉冲驱动下CH平面靶及其瑞利-泰勒不稳定性发展的情况.结果表明,在相同驱动激光能量作用下,初始阶段激光强度越低,上升越缓慢,高温烧蚀初始印记引起的密度调制幅度越大.提高预脉冲强度能显著抑制高温烧蚀初始印记效应.
In the direct-drive inertial confinement fusion, the initial imprint of high-temperature ablation plays an important role in the development of the instability of the compression process.Using X-ray pinhole-assisted point projection imaging, the effects of different impulse laser pulses on the CH planar targets and their Rayleigh-Taylor instability.The results show that under the same driving laser energy, the laser intensity in the initial stage is lower, the slower the rise, the greater the density modulation amplitude caused by the high-temperature ablation initial imprint is, the higher the pre-pulse intensity Can significantly inhibit the initial imprint of high temperature ablation effect.