An in-flight radiography platform to measure hydrodynamic instability growth in inertial confinement fusion capsules at the National Ignition Facility

被引：106

作者：

Raman, K. S. ^{[1
]}

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

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

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

Hoover, D. E. ^{[2
]}

Hurricane, O. A. ^{[1
]}

Kroll, J. J. ^{[1
]}

Nikroo, A. ^{[2
]}

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

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

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

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

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

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

Marinak, M. M. ^{[1
]}

Munro, D. H. ^{[1
]}

Peterson, K. J. ^{[3
]}

Salmonson, J. ^{[1
]}

机构：

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

[2] Gen Atom Co, San Diego, CA 92121 USA

[3] Sandia Natl Labs, Albuquerque, NM 87125 USA

来源：

PHYSICS OF PLASMAS | 2014年 / 21卷 / 07期

关键词：

RAYLEIGH-TAYLOR GROWTH; SINGLE-MODE; CONVERGENT; TARGETS; SIMULATIONS; STABILITY; RATES; HOT;

D O I：

10.1063/1.4890570

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：

A new in-flight radiography platform has been established at the National Ignition Facility (NIF) to measure Rayleigh-Taylor and Richtmyer-Meshkov instability growth in inertial confinement fusion capsules. The platform has been tested up to a convergence ratio of 4. An experimental campaign is underway to measure the growth of pre-imposed sinusoidal modulations of the capsule surface, as a function of wavelength, for a pair of ignition-relevant laser drives: a "low-foot" drive representative of what was fielded during the National Ignition Campaign (NIC) [Edwards et al., Phys. Plasmas 20, 070501 (2013)] and the new high-foot [Dittrich et al., Phys. Rev. Lett. 112, 055002 (2014); Park et al., Phys. Rev. Lett. 112, 055001 (2014)] pulse shape, for which the predicted instability growth is much lower. We present measurements of Legendre modes 30, 60, and 90 for the NIC-type, low-foot, drive, and modes 60 and 90 for the high-foot drive. The measured growth is consistent with model predictions, including much less growth for the high-foot drive, demonstrating the instability mitigation aspect of this new pulse shape. We present the design of the platform in detail and discuss the implications of the data it generates for the on-going ignition effort at NIF. (C) 2014 AIP Publishing LLC.

引用

页数：21

共 11 条

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