Dynamics and structure of self-generated magnetics fields on solids following high contrast, high intensity laser irradiation

被引：20

作者：

Albertazzi, B. ^{[1
,2
,3
]}

Chen, S. N. ^{[1
,4
]}

Antici, P. ^{[2
,5
]}

Boeker, J. ^{[6
]}

Borghesi, M. ^{[7
]}

Breil, J. ^{[8
]}

Dervieux, V. ^{[1
]}

Feugeas, J. L. ^{[8
]}

Lancia, L. ^{[5
]}

Nakatsutsumi, M. ^{[1
]}

Nicolai, Ph. ^{[8
]}

Romagnagni, L. ^{[1
]}

Shepherd, R. ^{[9
]}

Sentoku, Y. ^{[10
]}

Starodubtsev, M. ^{[4
]}

Swantusch, M. ^{[6
]}

Tikhonchuk, V. T. ^{[8
]}

Willi, O. ^{[6
]}

d'Humieres, E. ^{[8
]}

Pepin, H. ^{[2
]}

Fuchs, J. ^{[1
,4
]}

机构：

[1] UPMC, CEA, CNRS, Ecole Polytech,LULI, F-91128 Palaiseau, France

[2] INRS EMT, Varennes, PQ J3X 1S2, Canada

[3] Osaka Univ, Grad Sch Engn, Suita, Osaka 565087, Japan

[4] Inst Appl Phys, Nizhnii Novgorod 603950, Russia

[5] Univ Roma La Sapienza, Dept SBAI, I-00161 Rome, Italy

[6] Univ Dusseldorf, Inst Laser & Plasmaphys, Dusseldorf, Germany

[7] Queens Univ, Sch Math & Phys, Belfast, Antrim, North Ireland

[8] Univ Bordeaux, CNRS, CEA, CELIA, F-33405 Talence, France

[9] LLNL, Livermore, CA 94550 USA

[10] Univ Nevada, Dept Phys, Reno, NV 89557 USA

来源：

PHYSICS OF PLASMAS | 2015年 / 22卷 / 12期

基金：

英国工程与自然科学研究理事会; 加拿大自然科学与工程研究理事会;

关键词：

ION-ACCELERATION; SIMULATIONS; INSTABILITY;

D O I：

10.1063/1.4936095

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 dynamics of self-generated magnetic B-fields produced following the interaction of a high contrast, high intensity (I > 10(19) W cm(-2)) laser beam with thin (3 mu m thick) solid (Al or Au) targets is investigated experimentally and numerically. Two main sources drive the growth of B-fields on the target surfaces. B-fields are first driven by laser-generated hot electron currents that relax over similar to 10-20 ps. Over longer timescales, the hydrodynamic expansion of the bulk of the target into vacuum also generates B-field induced by non-collinear gradients of density and temperature. The laser irradiation of the target front side strongly localizes the energy deposition at the target front, in contrast to the target rear side, which is heated by fast electrons over a much larger area. This induces an asymmetry in the hydrodynamic expansion between the front and rear target surfaces, and consequently the associated B-fields are found strongly asymmetric. The sole long-lasting (>30 ps) B-fields are the ones growing on the target front surface, where they remain of extremely high strength (similar to 8-10 MG). These B-fields have been recently put by us in practical use for focusing laser-accelerated protons [B. Albertazzi et al., Rev. Sci. Instrum. 86, 043502 (2015)]; here we analyze in detail their dynamics and structure. (C) 2015 AIP Publishing LLC.

引用

页数：11

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