Impact of asymmetries on fuel performance in inertial confinement fusion

Impact of asymmetries on fuel performance in inertial confinement fusion
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惯性约束聚变中不对称性对燃料性能的影响

DOI:
10.1103/physreve.98.051201
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发表时间:
2018
期刊:
影响因子:
2.4
通讯作者:
Gatu Johnson M
Gatu Johnson M
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Gatu Johnson M

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低模非对称性阻碍了惯性约束聚变(ICF)内爆中燃料的有效压缩、约束和加热,而它们的控制是实现点火的关键。ICF实验中的离子温度()是从初级中子谱的展宽中推断出来的。燃烧时燃料的定向运动(流动)也会影响加宽,并将导致人为地夸大“”值。由于低模不对称引起的流动预计会引起测量的视线变化。我们报道了在欧米茄激光设备上进行的故意不对称驱动的实验,该实验旨在测试准确预测和测量由于低模非对称种子流引起的视线差异的能力。与嵌合体和X射线模拟相比,这些测量表明,必须考虑所有不对称种子才能完全捕获内爆中的流场。特别是,由保持目标的茎诱导的流动被发现干扰了播种的不对称性。在内爆的面密度上也观察到了根茎播种的不对称性。
Low-mode asymmetries prevent effective compression, confinement, and heating of the fuel in inertial confinement fusion (ICF) implosions, and their control is essential to achieving ignition. Ion temperatures () in ICF experiments are inferred from the broadening of primary neutron spectra. Directional motion (flow) of the fuel at burn also impacts broadening and will lead to artificially inflated “” values. Flow due to low-mode asymmetries is expected to give rise to line-of-sight variations in measured. We report on intentionally asymmetrically driven experiments at the OMEGA laser facility designed to test the ability to accurately predict and measure line-of-sight differences in apparentdue to low-mode asymmetry-seeded flows. Contrasted tochimeraand xragesimulations, the measurements demonstrate how all asymmetry seeds have to be considered to fully capture the flow field in an implosion. In particular, flow induced by the stalk that holds the target is found to interfere with the seeded asymmetry. A substantial stalk-seeded asymmetry in the areal density of the implosion is also observed.
OMEGA 激光器的皮秒光束定时系统。
DOI: 10.1063/1.4952440
发表时间: 2016
期刊: The Review of scientific instruments
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发表时间: 2004
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DOI: --
发表时间: 2016
期刊:
影响因子: --
作者:
D. Munro
通讯作者: D. Munro