Experimental investigation of bright spots in broadband, gated x-ray images of ignition-scale implosions on the National Ignition Facility

被引：23

作者：

Barrios, M. A. ^{[1
]}

Regan, S. P. ^{[2
]}

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

Glenn, S. ^{[1
]}

Benedetti, L. R. ^{[1
]}

Bradley, D. K. ^{[1
]}

Collins, G. W. ^{[1
]}

Epstein, R. ^{[2
]}

Hammel, B. A. ^{[1
]}

Kyrala, G. A. ^{[3
]}

Izumi, N. ^{[1
]}

Ma, T. ^{[1
]}

Scott, H. ^{[1
]}

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

机构：

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

[2] Univ Rochester, Laser Energet Lab, Rochester, NY 14623 USA

[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

PHYSICS OF PLASMAS | 2013年 / 20卷 / 07期

关键词：

Capsule surfaces - Deuterium-tritium - Experimental investigations - Filled plastics - Hydrodynamic instabilities - National ignition facility - Non-uniformities - Strong correlation;

D O I：

10.1063/1.4816034

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：

Bright spots in the hot spot intensity profile of gated x-ray images of ignition-scale implosions at the National Ignition Facility [G. H. Miller et al., Opt. Eng. 443, (2004)] are observed. X-ray images of cryogenically layered deuterium-tritium (DT) and tritium-hydrogen-deuterium (THD) ice capsules, and gas filled plastic shell capsules (Symcap) were recorded along the hohlraum symmetry axis. Heterogeneous mixing of ablator material and fuel into the hot spot (i.e., hot-spot mix) by hydrodynamic instabilities causes the bright spots. Hot-spot mix increases the radiative cooling of the hot spot. Fourier analysis of the x-ray images is used to quantify the evolution of bright spots in both x- and k-space. Bright spot images were azimuthally binned to characterize bright spot location relative to known isolated defects on the capsule surface. A strong correlation is observed between bright spot location and the fill tube for both Symcap and cryogenically layered DT and THD ice targets, indicating the fill tube is a significant seed for the ablation front instability causing hot-spot mix. The fill tube is the predominant seed for Symcaps, while other capsule non-uniformities are dominant seeds for the cryogenically layered DT and THD ice targets. A comparison of the bright spot power observed for Si-and Ge-doped ablator targets shows heterogeneous mix in Symcap targets is mostly material from the doped ablator layer. (C) 2013 AIP Publishing LLC.

引用

页数：10

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