Sensitivity of the dynamic-shell target to laser drive nonuniformities.

IF 2.2 3区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS
William Trickey, T J B Collins, I V Igumenshchev, V N Goncharov, A Shvydky
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Abstract

The dynamic-shell concept for inertial confinement fusion (ICF) uses an initially homogeneous target and a carefully shaped laser pulse to form a shell and implode it. The laser pulse consists of a series of pickets that drive shocks into the target. The first few shocks converge inwards and rebound from the center of the target, creating an expanding, low-density plasma. Subsequent shocks are launched into the expanding plasma and eventually coalesce to form a shell, which is then imploded with a traditional ICF laser pulse. This study describes radiation-hydrodynamic simulations that investigate the sensitivity of dynamic-shell targets to imperfections in the laser drive. A one-dimensional (1D) study looks at mistiming and power variations in the pickets and a two-dimensional (2D) study examines irradiation perturbations imposed by the laser-beam geometry. Simulations show that less than ∼2% power imbalance or 200 ps timing variation in the pickets is sufficient to keep the yield above 90% of the maximum. Additionally, the 2D simulations show that 72 or more beams are required to keep irradiation nonuniformities low enough to obtain fusion yields close to that of 1D simulations.

动态壳靶对激光驱动非均匀性的敏感性。
惯性约束聚变(ICF)的动态壳概念使用一个初始均匀的目标和一个精心形状的激光脉冲来形成一个壳并内爆它。激光脉冲由一系列的尖桩组成,这些尖桩驱动冲击进入目标。最初的几次冲击向内汇聚,并从目标中心反弹,形成一个不断膨胀的低密度等离子体。随后的冲击被发射到膨胀的等离子体中,最终合并形成一个壳层,然后用传统的ICF激光脉冲内爆。本研究描述了辐射-流体动力学模拟,研究了动态壳靶对激光驱动缺陷的敏感性。一项一维(1D)研究着眼于纠察中的错误时间和功率变化,一项二维(2D)研究考察了激光束几何形状施加的辐照扰动。模拟表明,在纠偏中小于~ 2%的功率不平衡或200ps的时序变化足以使产率保持在最大值的90%以上。此外,二维模拟表明,需要72束或更多的光束才能保持足够低的辐照不均匀性,以获得接近一维模拟的聚变产率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Physical Review E
Physical Review E PHYSICS, FLUIDS & PLASMASPHYSICS, MATHEMAT-PHYSICS, MATHEMATICAL
CiteScore
4.50
自引率
16.70%
发文量
2110
期刊介绍: Physical Review E (PRE), broad and interdisciplinary in scope, focuses on collective phenomena of many-body systems, with statistical physics and nonlinear dynamics as the central themes of the journal. Physical Review E publishes recent developments in biological and soft matter physics including granular materials, colloids, complex fluids, liquid crystals, and polymers. The journal covers fluid dynamics and plasma physics and includes sections on computational and interdisciplinary physics, for example, complex networks.
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