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Directional transport of fast electrons at the front target surface irradiated by intense femtosecond laser pulses with preformed plasma

  • X.X. Lin (a1), Y.T. Li (a1), B.C. Liu (a1) (a2) (a3), F. Liu (a1), F. Du (a1), S.J. Wang (a1), L.M. Chen (a1), L. Zhang (a1), X. Liu (a1), X.L. Liu (a1), Z.H. Wang (a1), J.L. Ma (a1), X. Lu (a1), Q.L. Dong (a1), W.M. Wang (a1), Z.M. Sheng (a1), Z.Y. Wei (a1) and J. Zhang (a1) (a4)...
Abstract

The effects of laser incidence angle on lateral fast electron transport at front target surface, when a plasma is preformed, irradiated by intense (>1018 W/cm2) laser pulses, are studied by Kα imaging technique and electron spectrometer. A horizontally asymmetric Kα halo, resulting from directional lateral electron transport and energy deposition, is observed for a large incidence angle (70°). Moreover, a group of MeV high energy electrons is emitted along target surface. It is believed that the deformed preplasma and the asymmetrical distribution of self-generated magnetic field, at large incidence angle, play an important role in the directional lateral electron transport.

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Corresponding author
Address correspondence and reprint requests: Y.T. Li, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. E-mail: ytli@aphy.iphy.ac.cn
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Laser and Particle Beams
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