Hydrodynamic instability growth and mix experiments at the National Ignition Facility

被引：63

作者：

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

Barrios, M. ^{[1
]}

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

Casey, D. T. ^{[1
]}

Cerjan, C. J. ^{[1
]}

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

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

Frenje, J. A. ^{[2
]}

Gatu-Johnson, M. ^{[2
]}

Glebov, V. Y. ^{[3
]}

Grim, G. ^{[4
]}

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

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

Hamza, A. ^{[1
]}

Hoover, D. E. ^{[5
]}

Hsing, W. W. ^{[1
]}

Hurricane, O. ^{[1
]}

Kilkenny, J. D. ^{[5
]}

Kline, J. L. ^{[4
]}

Knauer, J. P. ^{[3
]}

Kroll, J. ^{[1
]}

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

Lindl, J. D. ^{[1
]}

Ma, T. ^{[1
]}

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

Mintz, M. ^{[1
]}

Moore, A. ^{[6
]}

Nikroo, A. ^{[5
]}

Parham, T. ^{[1
]}

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

Petrasso, R. ^{[2
]}

Pickworth, L. ^{[1
]}

Pino, J. E. ^{[1
]}

Raman, K. ^{[1
]}

Regan, S. P. ^{[3
]}

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

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

Rowley, D. P. ^{[1
]}

Sayre, D. B. ^{[1
]}

Tipton, R. E. ^{[1
]}

Weber, S. V. ^{[1
]}

Widmann, K. ^{[1
]}

Wilson, D. C. ^{[4
]}

Yeamans, C. B. ^{[1
]}

机构：

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

[2] MIT, Cambridge, MA 02139 USA

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

[4] Los Alamos Natl Lab, Los Alamos, NM 87544 USA

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

[6] AWE Aldermaston, Reading RG7 4PR, Berks, England

来源：

PHYSICS OF PLASMAS | 2014年 / 21卷 / 05期

关键词：

RAYLEIGH-TAYLOR GROWTH; DECELERATION PHASE; 3-DIMENSIONAL SIMULATIONS; DISPERSION CURVE; IMPLOSION; DRIVEN; RATES;

D O I：

10.1063/1.4872026

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：

Hydrodynamic instability growth and its effects on implosion performance were studied at the National Ignition Facility [G. H. Miller, E. I. Moses, and C. R. Wuest, Opt. Eng. 443, 2841 (2004)]. Implosion performance and mix have been measured at peak compression using plastic shells filled with tritium gas and containing embedded localized carbon-deuterium diagnostic layers in various locations in the ablator. Neutron yield and ion temperature of the deuterium-tritium fusion reactions were used as a measure of shell-gas mix, while neutron yield of the tritium-tritium fusion reaction was used as a measure of implosion performance. The results have indicated that the low-mode hydrodynamic instabilities due to surface roughness were the primary culprits for yield degradation, with atomic ablator-gas mix playing a secondary role. In addition, spherical shells with pre-imposed 2D modulations were used to measure instability growth in the acceleration phase of the implosions. The capsules were imploded using ignition-relevant laser pulses, and ablation-front modulation growth was measured using x-ray radiography for a shell convergence ratio of similar to 2. The measured growth was in good agreement with that predicted, thus validating simulations for the fastest growing modulations with mode numbers up to 90 in the acceleration phase. Future experiments will be focused on measurements at higher convergence, higher-mode number modulations, and growth occurring during the deceleration phase. (C) 2014 AIP Publishing LLC.

引用

页数：8

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