The near vacuum hohlraum campaign at the NIF: A new approach

被引：50

作者：

Le Pape, S. ^{[1
]}

Hopkins, L. F. Berzak ^{[1
]}

Divol, L. ^{[1
]}

Meezan, N. ^{[1
]}

Turnbull, D. ^{[1
]}

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

Ho, D. ^{[1
]}

Ross, J. S. ^{[1
]}

Khan, S. ^{[1
]}

Pak, A. ^{[1
]}

Dewald, E. ^{[1
]}

Benedetti, L. R. ^{[1
]}

Nagel, S. ^{[1
]}

Biener, J. ^{[1
]}

Callahan, D. A. ^{[1
]}

Yeamans, C. ^{[1
]}

Michel, P. ^{[1
]}

Schneider, M. ^{[1
]}

Kozioziemski, B. ^{[1
]}

Ma, T. ^{[1
]}

Macphee, A. G. ^{[1
]}

Haan, S. ^{[1
]}

Izumi, N. ^{[1
]}

Hatarik, R. ^{[1
]}

Sterne, P. ^{[1
]}

Celliers, P. ^{[1
]}

Ralph, J. ^{[1
]}

Rygg, R. ^{[1
]}

Strozzi, D. ^{[1
]}

Kilkenny, J. ^{[3
]}

Rosenberg, M. ^{[1
]}

Rinderknecht, H. ^{[1
]}

Sio, H. ^{[4
]}

Gatu-Johnson, M. ^{[4
]}

Frenje, J. ^{[4
]}

Petrasso, R. ^{[4
]}

Zylstra, A. ^{[5
]}

Town, R. ^{[1
]}

Hurricane, O. ^{[1
]}

Nikroo, A. ^{[1
]}

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

机构：

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

[2] SLAC Natl Accelerator Lab, 2575 Sand Hill Rd,MS 19, Menlo Pk, CA 94025 USA

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

[4] MIT, Plasma Sci & Fus Ctr, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[5] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA

来源：

PHYSICS OF PLASMAS | 2016年 / 23卷 / 05期

关键词：

D O I：

10.1063/1.4950843

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：

The near vacuum campaign on the National Ignition Facility has concentrated its efforts over the last year on finding the optimum target geometry to drive a symmetric implosion at high convergence ratio (30x). As the hohlraum walls are not tamped with gas, the hohlraum is filling with gold plasma and the challenge resides in depositing enough energy in the hohlraum before it fills up. Hohlraum filling is believed to cause symmetry swings late in the pulse that are detrimental to the symmetry of the hot spot at high convergence. This paper describes a series of experiments carried out to examine the effect of increasing the distance between the hohlraum wall and the capsule (case to capsule ratio) on the symmetry of the hot spot. These experiments have shown that smaller Case to Capsule Ratio (CCR of 2.87 and 3.1) resulted in oblate implosions that could not be tuned round. Larger CCR (3.4) led to a prolate implosion at convergence 30x implying that inner beam propagation at large CCR is not impeded by the expanding hohlraum plasma. A Case to Capsule ratio of 3.4 is a promising geometry to design a round implosion but in a smaller hohlraum where the hohlraum losses are lower, enabling a wider cone fraction range to adjust symmetry. Published by AIP Publishing.

引用

页数：6

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