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arXiv 1503.08979physics.plasm-ph
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惯性约束聚变间接-直接混合驱动功主导热点点火

Indirect-direct hybrid-drive work-dominated hotspot ignition for inertial confinement fusion

X. T. He, Z. F. Fan, J. W. Li, J. Liu, K. Lan, J. F. Wu, L. F. Wang, W. H. Ye

摘要:

提出了一种间接-直接混合驱动功主导的惯性约束聚变热点点火方案:在具有八面体对称性的球形黑腔中,分层燃料包首先被间接驱动软X射线(辐射)压缩,然后在最后一个脉冲持续时间内被直接驱动激光压缩。在该方案中,直接驱动激光器驱动一个增强激波和一个后续压缩波,用于远大于辐射烧蚀压力的点火,并向热点提供大的pdV功,以实现功主导点火。数值模拟表明,增强激波阻止了间接驱动激波在主燃料-热点界面的反射,从而显著抑制了流体动力学不稳定性和非对称性。基于间接驱动的内爆动力学,热点被增强激波和后续压缩波进一步压缩和加热,导致以功为主的热点点火和燃烧,最大内爆速度约为400 km/s,收敛比约为25。用1.32 MJ的激光总能量实现了15 MJ的聚变产额。

英文摘要:

An indirect-direct hybrid-drive work-dominated hotspot ignition scheme for inertial confinement fusion is proposed: a layered fuel capsule inside a spherical hohlraum with an octahedral symmetry is compressed first by indirect-drive soft-x rays (radiation) and then by direct-drive lasers in last pulse duration. In this scheme, an enhanced shock and a follow-up compression wave for ignition with pressure far greater than the radiation ablation pressure are driven by the direct-drive lasers, and provide large pdV work to the hotspot to perform the work-dominated ignition. The numerical simulations show that the enhanced shock stops the reflections of indirect-drive shock at the main fuel-hotspot interface, and therefore significantly suppresses the hydrodynamic instabilities and asymmetry. Based on the indirect-drive implosion dynamics the hotspot is further compressed and heated by the enhanced shock and follow-up compression wave, resulting in the work-dominated hotspot ignition and burn with a maximal implosion velocity of ~400 km/s and a lower convergence ratio of ~25. The fusion yield of 15 MJ using total laser energy of 1.32 MJ is achieved.

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