Diagnosing and controlling mix in National Ignition Facility implosion experiments

被引：101

作者：

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

Scott, H. A. ^{[1
]}

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

Cerjan, C. ^{[1
]}

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

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

Epstein, R. ^{[2
]}

Glenzer, S. H. ^{[1
]}

Haan, S. W. ^{[1
]}

Izumi, N. ^{[1
]}

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

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

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

Langer, S. H. ^{[1
]}

Peterson, K. ^{[4
]}

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

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

Wilson, D. C. ^{[3
]}

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

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

来源：

PHYSICS OF PLASMAS | 2011年 / 18卷 / 05期

关键词：

TARGETS;

D O I：

10.1063/1.3567520

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：

High mode number instability growth of "isolated defects" on the surfaces of National Ignition Facility [Moses et al., Phys. Plasmas 16, 041006 (2009)] capsules can be large enough for the perturbation to penetrate the imploding shell, and produce a jet of ablator material that enters the hot-spot. Since internal regions of the CH ablator are doped with Ge, mixing of this material into the hot-spot results in a clear signature of Ge K-shell emission. Evidence of jets entering the hot-spot has been recorded in x-ray images and spectra, consistent with simulation predictions [Hammel et al., High Energy Density Phys. 6, 171 (2010)]. Ignition targets have been designed to minimize instability growth, and capsule fabrication improvements are underway to reduce "isolated defects." An experimental strategy has been developed where the final requirements for ignition targets can be adjusted through direct measurements of mix and experimental tuning. (C) 2011 American Institute of Physics. [doi:10.1063/1.3567520]

引用

页数：13

共 50 条

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