The effect of shock dynamics on compressibility of ignition-scale National Ignition Facility implosions

被引：21

作者：

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

Frenje, J. A. ^{[1
]}

Seguin, F. H. ^{[1
]}

Hicks, D. G. ^{[2
]}

Dewald, E. L. ^{[2
]}

Robey, H. F. ^{[2
]}

Rygg, J. R. ^{[2
]}

Meezan, N. B. ^{[2
]}

Rosenberg, M. J. ^{[1
]}

Rinderknecht, H. G. ^{[1
]}

Friedrich, S. ^{[2
]}

Bionta, R. ^{[2
]}

Olson, R. ^{[3
,4
]}

Atherton, J. ^{[2
]}

Barrios, M. ^{[2
]}

Bell, P. ^{[2
]}

Benedetti, R. ^{[2
]}

Hopkins, L. Berzak ^{[2
]}

Betti, R. ^{[5
]}

Bradley, D. ^{[2
]}

Callahan, D. ^{[2
]}

Casey, D. ^{[2
]}

Collins, G. ^{[2
]}

Dixit, S. ^{[2
]}

Doeppner, T. ^{[2
]}

Edgell, D. ^{[5
]}

Edwards, M. J. ^{[2
]}

Johnson, M. Gatu ^{[1
]}

Glenn, S. ^{[2
]}

Glenzer, S. ^{[2
]}

Grim, G. ^{[4
]}

Hatchett, S. ^{[2
]}

Jones, O. ^{[2
]}

Khan, S. ^{[2
]}

Kilkenny, J. ^{[6
]}

Kline, J. ^{[4
]}

Knauer, J. ^{[5
]}

Kritcher, A. ^{[2
]}

Kyrala, G. ^{[4
]}

Landen, O. ^{[2
]}

LePape, S. ^{[2
]}

Li, C. K. ^{[1
]}

Lindl, J. ^{[2
]}

Ma, T. ^{[2
]}

Mackinnon, A. ^{[2
]}

Macphee, A. ^{[2
]}

Manuel, M. J. -E. ^{[1
]}

Meyerhofer, D. ^{[5
]}

Moody, J. ^{[2
]}

Moses, E. ^{[2
]}

机构：

[1] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA

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

[3] Sandia Natl Labs, Albuquerque, NM 87185 USA

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

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

[6] Gen Atom Co, San Diego, CA 92186 USA

来源：

PHYSICS OF PLASMAS | 2014年 / 21卷 / 11期

基金：

美国国家科学基金会;

关键词：

INERTIAL-CONFINEMENT-FUSION; DESIGN;

D O I：

10.1063/1.4900621

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 effects of shock dynamics on compressibility of indirect-drive ignition-scale surrogate implosions, CH shells filled with (DHe)-He-3 gas, have been studied using charged-particle spectroscopy. Spectral measurements of (DHe)-He-3 protons produced at the shock-bang time probe the shock dynamics and in-flight characteristics of an implosion. The proton shock yield is found to vary by over an order of magnitude. A simple model relates the observed yield to incipient hot-spot adiabat, suggesting that implosions with rapid radiation-power increase during the main drive pulse may have a 2x higher hot-spot adiabat, potentially reducing compressibility. A self-consistent 1-D implosion model was used to infer the areal density (rho R) and the shell center-of-mass radius (R-cm) from the downshift of the shock-produced (DHe)-He-3 protons. The observed rho R at shock-bang time is substantially higher for implosions, where the laser drive is on until near the compression bang time ("short-coast"), while longer-coasting implosions have lower rho R. This corresponds to a much larger temporal difference between the shock- and compression-bang time in the long-coast implosions (similar to 800 ps) than in the short-coast (similar to 400 ps); this will be verified with a future direct bang-time diagnostic. This model-inferred differential bang time contradicts radiation-hydrodynamic simulations, which predict constant 700-800 ps differential independent of coasting time; this result is potentially explained by uncertainties in modeling late-time ablation drive on the capsule. In an ignition experiment, an earlier shock-bang time resulting in an earlier onset of shell deceleration, potentially reducing compression and, thus, fuel rho R. (C) 2014 AIP Publishing LLC.

引用

页数：18

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