Development and modeling of a polar-direct-drive exploding pusher platform at the National Ignition Facility

被引：28

作者：

Ellison, C. Leland ^{[1
]}

Whitley, Heather D. ^{[1
]}

Brown, Colin R. D. ^{[2
]}

Copeland, Sean R. ^{[1
]}

Garbett, Warren J. ^{[2
]}

Le, Hai P. ^{[1
]}

Schneider, Marilyn B. ^{[1
]}

Walters, Zachary B. ^{[1
]}

Chen, Hui ^{[1
]}

Castor, John I. ^{[1
]}

Craxton, R. Stephen ^{[3
]}

Johnson, Maria Gatu ^{[4
]}

Garcia, Emma M. ^{[3
]}

Graziani, Frank R. ^{[1
]}

Kemp, G. Elijah ^{[1
]}

Krauland, Christine M. ^{[5
]}

McKenty, Patrick W. ^{[3
]}

Lahmann, Brandon ^{[4
]}

Pino, Jesse E. ^{[1
]}

Rubery, Michael S. ^{[2
]}

Scott, Howard A. ^{[1
]}

Shepherd, Ronnie ^{[1
]}

Sio, Hong ^{[4
]}

机构：

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

[2] AWE Plc, Reading RG7 4PR, Berks, England

[3] Univ Rochester, Lab Laser Energet, Rochester, NY 14636 USA

[4] MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA

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

来源：

PHYSICS OF PLASMAS | 2018年 / 25卷 / 07期

关键词：

SIMULATIONS; PURGATORIO; DIFFUSION;

D O I：

10.1063/1.5025724

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-intensity laser facilities, such as the National Ignition Facility (NIF), enable the experimental investigation of plasmas under extreme, high-energy-density conditions. Motivated by validating models for collisional heat-transfer processes in high-energy-density plasmas, we have developed an exploding pusher platform for use at the NIF in the polar-direct-drive configuration. The baseline design employs a 3 mm-diameter capsule, an 18 mu m-thick CH ablator, and Ar-doped D2 gas to achieve several keV electron-ion temperature separations with relatively low convergence ratios. In an initial series of shots at the NIF-N160920-003, -005, and N160921-001-the ratio of the laser intensity at different polar angles was varied to optimize the symmetry of the implosion. Here we summarize experimental results from the shot series and present pre- and post-shot analysis. Although the polar-direct-drive configuration is inherently asymmetric, we successfully tuned a post-shot 1D model to a set of key implosion performance metrics. The post-shot model has proven effective for extrapolating capsule performance to higher incident laser drive. Overall, the simplicity of the platform and the efficacy of the post-shot 1D model make the polar-direct-drive exploding pusher platform attractive for a variety of applications beyond the originally targeted study of collisional processes in high-energy-density plasmas. Published by AIP Publishing.

引用

页数：13