Measurement of Kinetic-Scale Current Filamentation Dynamics and Associated Magnetic Fields in Interpenetrating Plasmas

被引：30

作者：

Swadling, G. F. ^{[1
]}

Bruulsema, C. ^{[2
,3
]}

Fiuza, F. ^{[3
]}

Higginson, D. P. ^{[1
]}

Huntington, C. M. ^{[1
]}

Park, H-S ^{[1
]}

Pollock, B. B. ^{[1
]}

Rozmus, W. ^{[2
,3
]}

Rinderknecht, H. G. ^{[4
]}

Katz, J. ^{[4
]}

Birkel, A. ^{[5
]}

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

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[2] Univ Alberta, Dept Phys, Edmonton, AB T6G 2E1, Canada

[3] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

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

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

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 124卷 / 21期

关键词：

COLLISIONLESS SHOCKS; GENERATION; INSTABILITY;

D O I：

10.1103/PhysRevLett.124.215001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present the first local, quantitative measurements of ion current filamentation and magnetic field amplification in interpenetrating plasmas, characterizing the dynamics of the ion Weibel instability. The interaction of a pair of laser-generated, counterpropagating, collisionless, supersonic plasma flows is probed using optical Thomson scattering (TS). Analysis of the TS ion-feature revealed anticorrelated modulations in the density of the two ion streams at the spatial scale of the ion skin depth c/omega(pi) = 120 mu m, and a correlated modulation in the plasma current. The inferred current profile implies a magnetic field amplitude similar to 30 +/- 6 T, corresponding to similar to 1% of the flow kinetic energy, indicating that magnetic trapping is the dominant saturation mechanism.

引用

页数：6

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