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Title: Particle-in-cell simulations of electron energization in laser-driven magnetic reconnection

Electrons can be energized during laser-driven magnetic reconnection, and the energized electrons form three super-Alfvénic electron jets in the outflow region (Lu et al 2014 New J. Phys. 16 083021). In this paper, by performing two-dimensional particle-in-cell simulations, we find that the electrons can also be significantly energized before magnetic reconnection occurs. When two plasma bubbles with toroidal magnetic fields expand and squeeze each other, the electrons in the magnetic ribbons are energized through betatron acceleration due to the enhancement of the magnetic field, and an electron temperature anisotropy $${T}_{{\rm{e}}\perp }\gt {T}_{{\rm{e}}| | }$$ develops. Meanwhile, some electrons are trapped and bounced repeatedly between the two expanding/approaching bubbles and get energized through a Fermi-like process. Furthermore, the energization before magnetic reconnection is more significant (or important) than that during magnetic reconnection.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [2]
  1. Univ. of Science and Technology of China, Hefei (People's Republic of China); Chinese Academy of Sciences (CAS), Beijing (China)
  2. Univ. of Science and Technology of China, Hefei (People's Republic of China)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Shanghai Jiao Tong Univ., Shanghai (People's Republic of China); Univ. of Strathclyde, Glasgow (United Kingdom)
Publication Date:
OSTI Identifier:
1329884
Report Number(s):
LA-UR--15-25105
Journal ID: ISSN 1367-2630
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 18; Journal Issue: 1; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
Univ. of Sci. and Tech. of China; USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY astronomy and astrophysics; electron energization; magnetic reconnection; laser-produced plasmas