Momentum transport and nonlocality in heat-flux-driven magnetic reconnection in high-energy-density plasmas

被引：4
|
作者：
Liu, Chang [1 ]
Fox, William [2 ]
Bhattacharjee, Amitava [1 ,2 ]
Thomas, Alexander G. R. [3 ,4 ]
Joglekar, Archis S. [4 ,5 ]
机构：
[1] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
[2] Princeton Plasma Phys Lab, Princeton, NJ 08540 USA
[3] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England
[4] Univ Michigan, Dept Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA
[5] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
来源：
PHYSICAL REVIEW E | 2017年 / 96卷 / 04期
基金：
美国国家科学基金会;
关键词：
LASER-PRODUCED PLASMAS; STEEP TEMPERATURE-GRADIENTS; WEIBEL INSTABILITY; FIELD; ELECTRON; MODELS;
D O I：
10.1103/PhysRevE.96.043203
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：
Recent theory has demonstrated a novel physics regime for magnetic reconnection in high-energy-density plasmas where the magnetic field is advected by heat flux via the Nernst effect. Here we elucidate the physics of the electron dissipation layer in this regime. Through fully kinetic simulation and a generalized Ohm's law derived from first principles, we show that momentum transport due to a nonlocal effect, the heat-flux-viscosity, provides the dissipation mechanism for magnetic reconnection. Scaling analysis, and simulations show that the reconnection process comprises a magnetic field compression stage and quasisteady reconnection stage, and the characteristic width of the current sheet in this regime is several electron mean-free paths. These results show the important interplay between nonlocal transport effects and generation of anisotropic components to the distribution function.
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页数：8
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