Validating hydrodynamic growth in National Ignition Facility implosions

被引:37
|
作者
Peterson, J. L. [1 ]
Casey, D. T. [1 ]
Hurricane, O. A. [1 ]
Raman, K. S. [1 ]
Robey, H. F. [1 ]
Smalyuk, V. A. [1 ]
机构
[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
关键词
INERTIAL CONFINEMENT FUSION; TAYLOR INSTABILITY; EVOLUTION;
D O I
10.1063/1.4920952
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
We present new hydrodynamic growth experiments at the National Ignition Facility, which extend previous measurements up to Legendre mode 160 and convergence ratio 4, continuing the growth factor dispersion curve comparison of the low foot and high foot pulses reported by Casey et al. [Phys. Rev. E 90, 011102(R) (2014)]. We show that the high foot pulse has lower growth factor and lower growth rate than the low foot pulse. Using novel on-capsule fiducial markers, we observe that mode 160 inverts sign (changes phase) for the high foot pulse, evidence of amplitude oscillations during the Richtmyer-Meshkov phase of a spherically convergent system. Post-shot simulations are consistent with the experimental measurements for all but the shortest wavelength perturbations, reinforcing the validity of radiation hydrodynamic simulations of ablation front growth in inertial confinement fusion capsules. (c) 2015 AIP Publishing LLC.
引用
收藏
页数:9
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