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Chin. Phys. B, 2018, Vol. 27(10): 105202    DOI: 10.1088/1674-1056/27/10/105202
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev   Next  

Dense pair plasma generation and its modulation dynamics in counter-propagating laser field

Wei-Yuan Liu(刘维媛)1,2, Wen Luo(罗文)1, Tao Yuan(袁韬)2,3, Ji-Ye Yu(余继晔)2,3, Min Chen(陈民)2,3
1 School of Nuclear Science and Technology, University of South China, Hengyang 421001, China;
2 Key Laboratory for Laser Plasmas(MoE), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China;
3 IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract  

With two-dimensional quantum electrodynamics (QED) particle-in-cell simulations, a dense electron-positron (e-e+) pair generation from laser-solid interactions is demonstrated. When the interaction of two linearly polarized laser pulses with a thin target enters into the relativistic transparency regime, a stable standing wave (SW) field can be formed by the overlap of the two counter-propagating laser pulses directly. The present study aims to clarify the effects of the SW field on the dynamics of e-e+ pair plasmas. Our results indicate that under the combined effect of the SW field and radiation reaction (RR) effect, the created e-e+ pairs can be trapped into the electric field nodes when the field strength is strong. The trapping effect contributes to the generation of γAV ≥ 400 and ultra-dense pair plasmas in the two-side irradiation scheme. Despite different laser intensities, these pair plasmas have a Maxwellian spectral distribution with a peak energy of 150 MeV. Besides, the periodical modulation of the average energy, spatial, phase-space, and angular patterns of the e-e+ pair plasmas can be triggered. In the angular patterns, as long as the SW field exists, pair plasmas can be pinched along the laser polarization direction. These results may offer a better understanding of the laser-solid interactions in the experiments when 10-PW laser facilities come into operation in the future.

Keywords:  PIC simulation      laser-plasma interaction      standing wave      radiation reaction  
Received:  31 May 2018      Revised:  10 August 2018      Accepted manuscript online: 
PACS:  52.27.Ep (Electron-positron plasmas)  
  52.27.Ny (Relativistic plasmas)  
  52.30.-q (Plasma dynamics and flow)  
Fund: 

Project supported by the National Basic Research Program of China (Grant No. 2013CBA01504), the National Natural Science Foundation of China (Grant Nos. 11347028, 11405083, and 11675075), the Natural Science Foundation of Hunan Province, China (Grant No. 2018JJ2315), and the Youth Talent Project of Hunan Province, China (Grant No. 2018RS3096).

Corresponding Authors:  Wen Luo, Min Chen     E-mail:  wen.luo@usc.edu.cn;minchen@sjtu.edu.cn

Cite this article: 

Wei-Yuan Liu(刘维媛), Wen Luo(罗文), Tao Yuan(袁韬), Ji-Ye Yu(余继晔), Min Chen(陈民) Dense pair plasma generation and its modulation dynamics in counter-propagating laser field 2018 Chin. Phys. B 27 105202

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