Self-generated magnetic fields in direct-drive implosion experiments

被引：40

作者：

Igumenshchev, I. V. ^{[1
]}

Zylstra, A. B. ^{[2
]}

Li, C. K. ^{[2
]}

Nilson, P. M. ^{[1
]}

Goncharov, V. N. ^{[1
]}

Petrasso, R. D. ^{[2
]}

机构：

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

[2] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA

来源：

PHYSICS OF PLASMAS | 2014年 / 21卷 / 06期

关键词：

PROTON RADIOGRAPHY; LASER; TRANSPORT;

D O I：

10.1063/1.4883226

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：

Electric and self-generated magnetic fields in direct-drive implosion experiments on the OMEGA Laser Facility were investigated employing radiography with similar to 10- to 60-MeV protons. The experiment used plastic-shell targets with imposed surface defects (glue spots, wires, and mount stalks), which enhance self-generated fields. The fields were measured during the 1-ns laser drive with an on-target intensity similar to 10(15) W/cm(2). Proton radiographs show multiple ring-like structures produced by electric fields similar to 10(7) V/cm and fine structures from surface defects, indicating self-generated fields up to similar to 3 MG. These electric and magnetic fields show good agreement with two-dimensional magnetohydrodynamic simulations when the latter include the del T-e x del n(e) source, Nernst convection, and anisotropic resistivity. The simulations predict that self-generated fields affect heat fluxes in the conduction zone and, through this, affect the growth of local perturbations. (C) 2014 AIP Publishing LLC.

引用

页数：10

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