Effects of resistive magnetic field on fast electron divergence measured in experiments

X. H. Yang, H. B. Zhuo, Y. Y. Ma, H. Xu, T. P. Yu, D. B. Zou, Z. Y. Ge, B. B. Xu, Q. J. Zhu, F. Q. Shao, M. Borghesi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Transport of fast electrons driven by an ultraintense laser through a tracer layer buried in solid targets is studied by particle-in-cell simulations. It is found that intense resistive magnetic fields, having a magnitude of several thousand Tesla, are generated at the interfaces of the materials due to the steep resistivity gradient between the target and tracer layer. Such magnetic fields can significantly inhibit the fast electron propagation. The electrons that can penetrate the first interface are mostly confined in the buried layer by the magnetic fields and cause heating of the tracer layer. The lateral extent of the heated region can be significantly larger than that of the relativistic electron beam. This finding suggests that the relativistic electron divergence inferred from Ká x-ray emission in experiments might be overestimated.

Original languageEnglish
Article number025011
Number of pages7
JournalPlasma Physics and Controlled Fusion
Volume57
Issue number2
Early online date22 Dec 2014
DOIs
Publication statusPublished - Feb 2015

Keywords

  • Divergence measument
  • Fast electron
  • Resistive magnetic field

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Nuclear Energy and Engineering

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