Mixing in ICF implosions on the National Ignition Facility caused by the fill-tube

被引：57

作者：

Weber, C. R. ^{[1
]}

Clark, D. S. ^{[1
]}

Pak, A. ^{[1
]}

Alfonso, N. ^{[2
]}

Bachmann, B. ^{[1
]}

Hopkins, L. F. Berzak ^{[1
]}

Bunn, T. ^{[1
]}

Crippen, J. ^{[2
]}

Divol, L. ^{[1
]}

Dittrich, T. ^{[1
]}

Kritcher, A. L. ^{[1
]}

Landen, O. L. ^{[1
]}

Le Pape, S. ^{[1
,3
]}

MacPhee, A. G. ^{[1
]}

Marley, E. ^{[1
]}

Masse, L. P. ^{[1
]}

Milovich, J. L. ^{[1
]}

Nikroo, A. ^{[1
]}

Patel, P. K. ^{[1
]}

Pickworth, L. A. ^{[1
]}

Rice, N. ^{[2
]}

Smalyuk, V. A. ^{[1
]}

Stadermann, M. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[2] Gen Atom, San Diego, CA 92168 USA

[3] Sorbonne Univ, UPMC Univ Paris 06, Univ Paris Saclay, LULI,CNRS,Ecole Polytech,CEA, F-91128 Palaiseau, France

来源：

PHYSICS OF PLASMAS | 2020年 / 27卷 / 03期

关键词：

FABRICATION; TARGETS;

D O I：

10.1063/1.5125599

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The micrometer-scale tube that fills capsules with thermonuclear fuel in inertial confinement fusion experiments at the National Ignition Facility is also one of the implosion's main degradation sources. It seeds a perturbation that injects the ablator material into the center, radiating away some of the hot-spot energy. This paper discusses how the perturbation arises in experiments using high-density carbon ablators and how the ablator mix interacts once it enters the hot-spot. Both modeling and experiments show an in-flight areal-density perturbation and localized x-ray emission at stagnation from the fill-tube. Simulations suggest that the fill-tube is degrading an otherwise 1D implosion by similar to 2x, but when other degradation sources are present, the yield reduction is closer to 20%. Characteristics of the fill-tube assembly, such as the through-hole size and the glue mass, alter the dynamics and magnitude of the degradation. These aspects point the way toward improvements in the design, some of which (smaller diameter fill-tube) have already shown improvements. Published under license by AIP Publishing.

引用

页数：15

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