Abstract

The influence of heating homogeneity violations in a laser thermonuclear target designed for shock ignition on the target compression and burning has been studied. We have performed our studies based on two-dimensional hydrodynamic simulations when modeling the target heating homogeneity violations due to various factors of symmetry violation of the target irradiation by a finite number of laser beams. The gains have been calculated at various perturbation amplitudes of the spatial distribution of absorbed energy in the target for two characteristic cases—low and high dominant perturbation modes. The first and second cases refer, respectively, to the factors of regular irradiation homogeneity violation due to a finite number of laser beams and a target offset from the focusing point and the factors of stochastic irradiation homogeneity violation related to laser beam energy imbalance, beam mispointing, and beam mistiming. We show that for a target designed for shock ignition the factors of regular irradiation homogeneity violation are much more dangerous than those for a spark ignition target.

中文翻译：

---

在违反激光束辐照对称性的条件下，电击对热核的压缩和燃烧

摘要

研究了在设计用于冲击点火的激光热核靶中违反加热均匀性对靶压缩和燃烧的影响。在对目标加热均匀性违规建模时，我们基于二维流体动力学模拟进行了研究，这是由于有限数量的激光束对称地违反了目标辐照的各种因素。在两种特征情况下（低和高主导扰动模式），已在目标中吸收能量的空间分布的各种扰动幅度下计算了增益。第一种情况和第二种情况分别涉及 由于有限数量的激光束和偏离焦点的目标而导致规则照射均匀性违背的因素，以及与激光束能量不平衡，光束指向错误和光束雾化有关的随机照射均匀性违背的因素。我们表明，对于设计用于冲击点火的目标，经常违反辐射均匀性的因素比对于火花点火目标的危险要危险得多。