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Title: Identifying the source of super-high energetic electrons in the presence of pre-plasma in laser–matter interaction at relativistic intensities

The generation of super-high energetic electrons influenced by pre-plasma in relativistic intensity laser–matter interaction is studied in a one-dimensional slab approximation with particle-in-cell simulations. Different pre-plasma scale lengths and laser intensities are considered, showing an increase in both particle number and cut-off kinetic energy of electrons with the increase of pre-plasma scale length and laser intensity, the cut-off kinetic energy greatly exceeding the corresponding laser ponderomotive energy. A two-stage electron acceleration model is proposed to explain the underlying physics. The first stage is attributed to the synergetic acceleration by longitudinal electric field and counter-propagating laser pulses, and a scaling law is obtained with efficiency depending on the pre-plasma scale length and laser intensity. These electrons pre-accelerated in the first stage could build up an intense electrostatic potential barrier with maximal value several times as large as the initial electron kinetic energy. Some of the energetic electrons could be further accelerated by reflection off the electrostatic potential barrier, with their finial kinetic energies significantly higher than the values pre-accelerated in the first stage.
Authors:
 [1] ;  [2] ;  [1] ;  [1]
  1. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Optics and Fine Mechanics, State Key Lab. of High Field Laser Physics
  2. Univ. of California, San Diego, CA (United States)
Publication Date:
Grant/Contract Number:
NA0001858; 11304331; 11174303; 61221064
Type:
Published Article
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 1; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Research Org:
Univ. of California, San Diego, CA (United States)
Sponsoring Org:
USDOE; National Natural Science Foundation of China (NNSFC); National Basic Research Program of China
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma physics; intense laser; plasma heating
OSTI Identifier:
1328547
Alternate Identifier(s):
OSTI ID: 1328548; OSTI ID: 1425833

Wu, D., Krasheninnikov, S. I., Luan, S. X., and Yu, W.. Identifying the source of super-high energetic electrons in the presence of pre-plasma in laser–matter interaction at relativistic intensities. United States: N. p., Web. doi:10.1088/0029-5515/57/1/016007.
Wu, D., Krasheninnikov, S. I., Luan, S. X., & Yu, W.. Identifying the source of super-high energetic electrons in the presence of pre-plasma in laser–matter interaction at relativistic intensities. United States. doi:10.1088/0029-5515/57/1/016007.
Wu, D., Krasheninnikov, S. I., Luan, S. X., and Yu, W.. 2016. "Identifying the source of super-high energetic electrons in the presence of pre-plasma in laser–matter interaction at relativistic intensities". United States. doi:10.1088/0029-5515/57/1/016007.
@article{osti_1328547,
title = {Identifying the source of super-high energetic electrons in the presence of pre-plasma in laser–matter interaction at relativistic intensities},
author = {Wu, D. and Krasheninnikov, S. I. and Luan, S. X. and Yu, W.},
abstractNote = {The generation of super-high energetic electrons influenced by pre-plasma in relativistic intensity laser–matter interaction is studied in a one-dimensional slab approximation with particle-in-cell simulations. Different pre-plasma scale lengths and laser intensities are considered, showing an increase in both particle number and cut-off kinetic energy of electrons with the increase of pre-plasma scale length and laser intensity, the cut-off kinetic energy greatly exceeding the corresponding laser ponderomotive energy. A two-stage electron acceleration model is proposed to explain the underlying physics. The first stage is attributed to the synergetic acceleration by longitudinal electric field and counter-propagating laser pulses, and a scaling law is obtained with efficiency depending on the pre-plasma scale length and laser intensity. These electrons pre-accelerated in the first stage could build up an intense electrostatic potential barrier with maximal value several times as large as the initial electron kinetic energy. Some of the energetic electrons could be further accelerated by reflection off the electrostatic potential barrier, with their finial kinetic energies significantly higher than the values pre-accelerated in the first stage.},
doi = {10.1088/0029-5515/57/1/016007},
journal = {Nuclear Fusion},
number = 1,
volume = 57,
place = {United States},
year = {2016},
month = {10}
}