Formation of electron energy spectra during magnetic reconnection in laser-produced plasma

Kai Huang, Quanming Lu, Can Huang, Quanli Dong, Huanyu Wang, Feibin Fan, Zhengming Sheng, Shui Wang, Jie Zhang

Research output: Contribution to journalArticle

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Abstract

The energetic electron spectra formed during magnetic reconnection between two laser-produced plasma bubbles are investigated by use of two-dimensional particle-in-cell simulations. It is found that the evolution of such interaction between the two plasma bubbles can be separated into two distinct stages: the squeezing and reconnection stages. In the squeezing stage, when the two plasma bubbles expand quickly and collide with each other, the magnetic field in the inflow region is greatly enhanced. In the second stage, a thin current sheet is formed between the two plasma bubbles, and then magnetic reconnection occurs therein. During the squeezing stage, electrons are heated in the perpendicular direction by betatron acceleration due to the enhancement of the magnetic field around the plasma bubbles. Meanwhile, non-thermal electrons are generated by the Fermi mechanism when these electrons bounce between the two plasma bubbles approaching quickly and get accelerated mainly by the convective electric field associated with the plasma bubbles. During the reconnection stage, electrons get further accelerated mainly by the reconnection electric field in the vicinity of the X line. When the expanding speed of the plasma bubbles is sufficiently large, the formed electron energy spectra have a kappa distribution, where the lower energy part satisfies a Maxwellian function and the higher energy part is a power-law distribution. Moreover, the increase of the expanding speed will result in the hardening of formed power-law spectra in both the squeezing and reconnection stages.
Original languageEnglish
Pages (from-to)1-28
Number of pages28
JournalPhysics of Plasmas
Volume24
Issue number9
Publication statusAccepted/In press - 21 Aug 2017

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plasma bubbles
laser plasmas
energy spectra
electron energy
compressing
electrons
betatrons
electric fields
current sheets
magnetic fields
hardening
energy
augmentation

Keywords

  • magnetic reconnection
  • plasma bubbles
  • particle-in-cell simulations

Cite this

Huang, K., Lu, Q., Huang, C., Dong, Q., Wang, H., Fan, F., ... Zhang, J. (Accepted/In press). Formation of electron energy spectra during magnetic reconnection in laser-produced plasma. Physics of Plasmas, 24(9), 1-28.
Huang, Kai ; Lu, Quanming ; Huang, Can ; Dong, Quanli ; Wang, Huanyu ; Fan, Feibin ; Sheng, Zhengming ; Wang, Shui ; Zhang, Jie. / Formation of electron energy spectra during magnetic reconnection in laser-produced plasma. In: Physics of Plasmas. 2017 ; Vol. 24, No. 9. pp. 1-28.
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abstract = "The energetic electron spectra formed during magnetic reconnection between two laser-produced plasma bubbles are investigated by use of two-dimensional particle-in-cell simulations. It is found that the evolution of such interaction between the two plasma bubbles can be separated into two distinct stages: the squeezing and reconnection stages. In the squeezing stage, when the two plasma bubbles expand quickly and collide with each other, the magnetic field in the inflow region is greatly enhanced. In the second stage, a thin current sheet is formed between the two plasma bubbles, and then magnetic reconnection occurs therein. During the squeezing stage, electrons are heated in the perpendicular direction by betatron acceleration due to the enhancement of the magnetic field around the plasma bubbles. Meanwhile, non-thermal electrons are generated by the Fermi mechanism when these electrons bounce between the two plasma bubbles approaching quickly and get accelerated mainly by the convective electric field associated with the plasma bubbles. During the reconnection stage, electrons get further accelerated mainly by the reconnection electric field in the vicinity of the X line. When the expanding speed of the plasma bubbles is sufficiently large, the formed electron energy spectra have a kappa distribution, where the lower energy part satisfies a Maxwellian function and the higher energy part is a power-law distribution. Moreover, the increase of the expanding speed will result in the hardening of formed power-law spectra in both the squeezing and reconnection stages.",
keywords = "magnetic reconnection, plasma bubbles, particle-in-cell simulations",
author = "Kai Huang and Quanming Lu and Can Huang and Quanli Dong and Huanyu Wang and Feibin Fan and Zhengming Sheng and Shui Wang and Jie Zhang",
note = "This is the Accepted Manuscript of Huang, K, Lu, Q, Huang, C, Dong, Q, Wang, H, Fan, F, Sheng, Z, Wang, S & Zhang, J 2017, 'Formation of electron energy spectra during magnetic reconnection in laser-produced plasma' Physics of Plasmas, vol 24, no. 09, pp. 1-28, the Version of Record will be available at http://aip.scitation.org/journal/php/ on publication.",
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Huang, K, Lu, Q, Huang, C, Dong, Q, Wang, H, Fan, F, Sheng, Z, Wang, S & Zhang, J 2017, 'Formation of electron energy spectra during magnetic reconnection in laser-produced plasma', Physics of Plasmas, vol. 24, no. 9, pp. 1-28.

Formation of electron energy spectra during magnetic reconnection in laser-produced plasma. / Huang, Kai; Lu, Quanming; Huang, Can; Dong, Quanli; Wang, Huanyu; Fan, Feibin; Sheng, Zhengming; Wang, Shui; Zhang, Jie.

In: Physics of Plasmas, Vol. 24, No. 9, 21.08.2017, p. 1-28.

Research output: Contribution to journalArticle

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AU - Huang, Kai

AU - Lu, Quanming

AU - Huang, Can

AU - Dong, Quanli

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AU - Sheng, Zhengming

AU - Wang, Shui

AU - Zhang, Jie

N1 - This is the Accepted Manuscript of Huang, K, Lu, Q, Huang, C, Dong, Q, Wang, H, Fan, F, Sheng, Z, Wang, S & Zhang, J 2017, 'Formation of electron energy spectra during magnetic reconnection in laser-produced plasma' Physics of Plasmas, vol 24, no. 09, pp. 1-28, the Version of Record will be available at http://aip.scitation.org/journal/php/ on publication.

PY - 2017/8/21

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N2 - The energetic electron spectra formed during magnetic reconnection between two laser-produced plasma bubbles are investigated by use of two-dimensional particle-in-cell simulations. It is found that the evolution of such interaction between the two plasma bubbles can be separated into two distinct stages: the squeezing and reconnection stages. In the squeezing stage, when the two plasma bubbles expand quickly and collide with each other, the magnetic field in the inflow region is greatly enhanced. In the second stage, a thin current sheet is formed between the two plasma bubbles, and then magnetic reconnection occurs therein. During the squeezing stage, electrons are heated in the perpendicular direction by betatron acceleration due to the enhancement of the magnetic field around the plasma bubbles. Meanwhile, non-thermal electrons are generated by the Fermi mechanism when these electrons bounce between the two plasma bubbles approaching quickly and get accelerated mainly by the convective electric field associated with the plasma bubbles. During the reconnection stage, electrons get further accelerated mainly by the reconnection electric field in the vicinity of the X line. When the expanding speed of the plasma bubbles is sufficiently large, the formed electron energy spectra have a kappa distribution, where the lower energy part satisfies a Maxwellian function and the higher energy part is a power-law distribution. Moreover, the increase of the expanding speed will result in the hardening of formed power-law spectra in both the squeezing and reconnection stages.

AB - The energetic electron spectra formed during magnetic reconnection between two laser-produced plasma bubbles are investigated by use of two-dimensional particle-in-cell simulations. It is found that the evolution of such interaction between the two plasma bubbles can be separated into two distinct stages: the squeezing and reconnection stages. In the squeezing stage, when the two plasma bubbles expand quickly and collide with each other, the magnetic field in the inflow region is greatly enhanced. In the second stage, a thin current sheet is formed between the two plasma bubbles, and then magnetic reconnection occurs therein. During the squeezing stage, electrons are heated in the perpendicular direction by betatron acceleration due to the enhancement of the magnetic field around the plasma bubbles. Meanwhile, non-thermal electrons are generated by the Fermi mechanism when these electrons bounce between the two plasma bubbles approaching quickly and get accelerated mainly by the convective electric field associated with the plasma bubbles. During the reconnection stage, electrons get further accelerated mainly by the reconnection electric field in the vicinity of the X line. When the expanding speed of the plasma bubbles is sufficiently large, the formed electron energy spectra have a kappa distribution, where the lower energy part satisfies a Maxwellian function and the higher energy part is a power-law distribution. Moreover, the increase of the expanding speed will result in the hardening of formed power-law spectra in both the squeezing and reconnection stages.

KW - magnetic reconnection

KW - plasma bubbles

KW - particle-in-cell simulations

UR - http://aip.scitation.org/journal/php/

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VL - 24

SP - 1

EP - 28

JO - Physics of Plasmas

JF - Physics of Plasmas

SN - 1070-664X

IS - 9

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Huang K, Lu Q, Huang C, Dong Q, Wang H, Fan F et al. Formation of electron energy spectra during magnetic reconnection in laser-produced plasma. Physics of Plasmas. 2017 Aug 21;24(9):1-28.