Magnetic field annihilation and reconnection driven by femtosecond lasers in inhomogeneous plasma

You Yuan Wang, FeiYu Li, Min Chen, SuMing Weng, QuanMing Lu, QuanLi Dong, ZhengMing Sheng, Jie Zhang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The process of fast magnetic reconnection driven by intense ultra-short laser pulses in underdense plasma is investigated by particle-in-cell simulations. In the wakefield of such laser pulses, quasi-static magnetic fields at a few mega-Gauss are generated due to nonvanishing cross product ∆(n /γ) × p. Excited in an inhomogeneous plasma of decreasing density, the quasi-static magnetic field structure is shown to drift quickly both in lateral and longitudinal directions. When two parallel-propagating laser pulses with close focal spot separation are used, such field drifts can develop into magnetic reconnection (annihilation) in their overlapping region, resulting in the conversion of magnetic energy to kinetic energy of particles. The reconnection rate is found to be much higher than the value obtained in the Hall magnetic reconnection model. Our work proposes a potential way to study magnetic reconnection-related physics with short-pulse lasers of terawatt peak power only.

LanguageEnglish
Article number115211
Number of pages14
JournalScience China: Physics, Mechanics and Astronomy
Volume60
Issue number11
Early online date18 Aug 2017
DOIs
Publication statusPublished - 1 Nov 2017

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simulation
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Keywords

  • laser wakefield
  • magnetic field generation
  • magnetic reconnection

Cite this

Wang, You Yuan ; Li, FeiYu ; Chen, Min ; Weng, SuMing ; Lu, QuanMing ; Dong, QuanLi ; Sheng, ZhengMing ; Zhang, Jie. / Magnetic field annihilation and reconnection driven by femtosecond lasers in inhomogeneous plasma. In: Science China: Physics, Mechanics and Astronomy. 2017 ; Vol. 60, No. 11.
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Magnetic field annihilation and reconnection driven by femtosecond lasers in inhomogeneous plasma. / Wang, You Yuan; Li, FeiYu; Chen, Min; Weng, SuMing; Lu, QuanMing; Dong, QuanLi; Sheng, ZhengMing; Zhang, Jie.

In: Science China: Physics, Mechanics and Astronomy, Vol. 60, No. 11, 115211, 01.11.2017.

Research output: Contribution to journalArticle

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T1 - Magnetic field annihilation and reconnection driven by femtosecond lasers in inhomogeneous plasma

AU - Wang, You Yuan

AU - Li, FeiYu

AU - Chen, Min

AU - Weng, SuMing

AU - Lu, QuanMing

AU - Dong, QuanLi

AU - Sheng, ZhengMing

AU - Zhang, Jie

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AB - The process of fast magnetic reconnection driven by intense ultra-short laser pulses in underdense plasma is investigated by particle-in-cell simulations. In the wakefield of such laser pulses, quasi-static magnetic fields at a few mega-Gauss are generated due to nonvanishing cross product ∆(n /γ) × p. Excited in an inhomogeneous plasma of decreasing density, the quasi-static magnetic field structure is shown to drift quickly both in lateral and longitudinal directions. When two parallel-propagating laser pulses with close focal spot separation are used, such field drifts can develop into magnetic reconnection (annihilation) in their overlapping region, resulting in the conversion of magnetic energy to kinetic energy of particles. The reconnection rate is found to be much higher than the value obtained in the Hall magnetic reconnection model. Our work proposes a potential way to study magnetic reconnection-related physics with short-pulse lasers of terawatt peak power only.

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KW - magnetic field generation

KW - magnetic reconnection

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