神光Ⅲ原型装置直接驱动均匀辐照设计及在快点火中的潜在应用

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。

Abstract

The illumination uniformity on the capsule surface is very important for inertial confinement fusion (ICF) to achieve ignition. In this paper, we analyze the direct drive illumination uniformity provided by Shenguang Ⅲ prototype laser facility which is designed for indirect drive ICF. Highly uniform irradiation is achieved by optimizing the intensity distribution within a laser beam when the power imbalance and pointing errors are taken into account and the results show that the intensity on the capsule becomes more uniform as laser uncertainties decrease. Furthermore, the relation between optimized intensity on the capsule surface and the laser parameters is analyzed and the results show that we can adjust the mean intensity on the capsule surface by changing optimized parameters with length dimension, which is useful for target design. Finally, the optimized results are applied to direct drive fast ignition and it shows that they are applicable when the cone is in the polar region of the capsule and the half cone angle is less than 30°.

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田超, 单连强, 周维民, 刘东晓, 毕碧, 张锋, 王为武, 谷渝秋, 张保汉. 神光Ⅲ原型装置直接驱动均匀辐照设计及在快点火中的潜在应用[J]. 强激光与粒子束, 2015, 27(9): 092010. Tian Chao, Shan Lianqiang, Zhou Weimin, Liu Dongxiao, Bi Bi, Zhang Feng, Wang Weiwu, Gu Yuqiu, Zhang Baohan. Optimization of illumination uniformity of Shenguang Ⅲ prototype facility and its potential application in fast ignition[J]. High Power Laser and Particle Beams, 2015, 27(9): 092010.

神光Ⅲ原型装置直接驱动均匀辐照设计及在快点火中的潜在应用

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