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研究了基于间接驱动设计的神光Ⅲ原型装置在直接驱动方式下提供的辐照均匀程度,在考虑激光瞄准偏差以及激光束间能量偏差的情况下,通过优化激光光斑内部光强分布实现了球靶表面较高程度的均匀辐照。研究表明光强均方根随激光偏差的减小而降低。在优化结果基础上,分析了优化光强与实际光强的联系,指出可通过同步放缩具有长度量纲的量调整靶球表面平均光强,为后续靶设计提供了依据。最后,研究了优化结果在直接驱动快点火技术途径下的应用,分析了导引锥对激光传输的影响,表明当导引锥位于靶球两极方向,并且半锥角小于30°时,导引锥对锥外部靶球表面的光强分布影响较小,优化结果亦可应用于直接驱动快点火。
In this paper, the uniformity of irradiance provided by direct prototype of Shen Guang Ⅲ prototype device based on indirect driving is studied. By considering the laser aiming deviation and the energy deviation between laser beams, the light intensity distribution inside the laser spot is optimized. The target surface is irradiated to a high degree. The research shows that the root mean square of light intensity decreases with the decrease of laser deviation. Based on the optimization results, the relationship between the optimum light intensity and the actual light intensity was analyzed. It was pointed out that the average light intensity of the target sphere could be adjusted by scaling the dimension of the length dimension synchronously, which provided the basis for the subsequent target design. Finally, the application of the optimization results in the direct-drive fast ignition technique was studied. The influence of the guide cone on the laser transmission was analyzed. The results show that when the guide cone is located in the polar direction of the target ball and the half cone angle is less than 30 °, The cone has little effect on the light intensity distribution on the outer surface of the cone, and the optimization result can also be applied to directly drive the quick ignition.