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极向驱动是在间接驱动构型的激光装置中,通过重瞄各束激光的位置,实现较均匀的靶丸表面激光辐照,以研究直接驱动惯性约束聚变的关键物理问题.介绍了神光Ⅲ主机装置的激光排布和焦斑特点,以及激光束重瞄方法和靶丸表面激光辐照均匀性优化原则.给出了三阶和五阶超高斯近似下的激光焦斑强度分布,Φ540μm靶丸在能量沉积满足cos~2γ和cosγ假设时靶丸表面最均匀辐照的移束参数,以及二维辐射流体程序模拟最优移束时的内爆对称性结果.二维模拟结果表明,按cos吖假设移束的热斑更对称.分析了激光的束间功率不平衡、激光束重瞄精度和靶丸定位精度对靶丸表面辐照均匀性的影响.模拟结果表明,为了不显著降低靶丸表面辐照均匀性,需要将束间功率不平衡控制在5%以内,激光束重瞄精度和靶丸定位精度控制在7μm以内.
In the indirect driving configuration, the polar driving system achieves the uniform laser irradiation on the surface of the target by re-scanning the positions of the laser beams to study the key physics problems of direct driving inertial confinement fusion. Ⅲ host device and the principle of laser beam re-aiming method and the uniformity of laser irradiation on the surface of the target are given.The laser focal spot intensity distribution of third-order and fifth-order super-Gaussian approximations are given, Φ540μm The most uniform beam shift parameters of the target surface when the energy deposition satisfies the cos ~ 2γ and cosγ hypothesis and the implosion symmetry results when the two-dimensional radiation fluid program simulates the optimal beam migration.The two-dimensional simulation results show that, According to cos acridine hypothetical beam shift more symmetrical hot spot.Analysis of laser beam power imbalance, laser beam repeater accuracy and target positioning accuracy of the pellet surface irradiation uniformity.The simulation results show that, in order not to be significant Reduce the uniformity of radiation on the surface of the target, the power imbalance between the beams needs to be controlled within 5%, and the accuracy of the laser beam re-sighting and the precision of the positioning of the pellet should be controlled within 7μm.