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Preplasma effects on the emission directions of energetic electrons in relativistic laser–solid interactions

Published online by Cambridge University Press:  20 December 2006

Y. Y. MA ,
Z. M. SHENG ,
Y. T. LI ,
J. ZHANG ,
X. H. YUAN ,
M. H. XU ,
Z. Y. ZHENG ,
W. W. CHANG ,
M. CHEN  and
J. ZHENG
Y. Y. MA
Affiliation:
Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China Department of Physics, National University of Defense Technology, Changsha 410073, People's Republic of China Present address: Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China.
Z. M. SHENG
Affiliation:
Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
Y. T. LI
Affiliation:
Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
J. ZHANG
Affiliation:
Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
X. H. YUAN
Affiliation:
Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
M. H. XU
Affiliation:
Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
Z. Y. ZHENG
Affiliation:
Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
W. W. CHANG
Affiliation:
Department of Physics, National University of Defense Technology, Changsha 410073, People's Republic of China
M. CHEN
Affiliation:
Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
J. ZHENG
Affiliation:
Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
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Abstract

Motivated by recent experimental observations of fast electron jets emitted along the target surface in intense laser–solid interactions with a large incident angle of the laser pulse, we simulate electron emissions by two-dimensional particle-in-cell simulations. When there is no preplasma in advance of the main laser pulse, electrons are emitted dominantly along the target surface. However, when there is preplasma, electron emission changes to the target normal. This difference originates from the different absorption mechanisms and different Coulomb electrostatic fields and self-generated magnetic fields induced in front of the target for the two cases.

Type
Papers
Information
Journal of Plasma Physics , Volume 72 , Issue 6 , December 2006 , pp. 1269 - 1272
Copyright
2006 Cambridge University Press

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