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Magnetic reconnection and plasma dynamics in two-beam laser-solid interactions.

P M Nilson1, L Willingale, M C Kaluza

  • 1Department of Physics, Imperial College, London SW7 2AZ, United Kingdom.

Physical Review Letters
|February 7, 2007
PubMed
Summary

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We observed magnetic reconnection in laser-produced plasma, revealing high-velocity jets and strong magnetic fields. These findings advance our understanding of plasma physics and astrophysical phenomena.

Area of Science:

  • Plasma Physics
  • Astrophysics
  • Laser-Induced Plasmas

Background:

  • Magnetic reconnection is a fundamental plasma process crucial for energy release in various space and laboratory settings.
  • Understanding reconnection in laser-produced plasmas offers insights into astrophysical phenomena like solar flares and laboratory fusion.

Purpose of the Study:

  • To investigate magnetic reconnection dynamics in a plasma generated by focused laser beams on a solid target.
  • To characterize the magnetic fields, plasma outflows, and temperatures associated with this reconnection event.

Main Methods:

  • Utilized two laser beams (1 ns pulse, 1 x 10^15 W cm^-2) focused on a planar solid target to create plasma.
  • Employed simultaneous optical probing and proton grid deflectometry to measure plasma outflows and magnetic fields.

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  • Conducted Thomson scattering measurements to determine electron temperatures in the reconnection layer.

    • Main Results:

    • Observed two high-velocity, collimated outflowing jets originating from the reconnection region.
    • Measured strong magnetic fields ranging from 0.7 to 1.3 MG at the edges of the focal spot.
    • Thomson scattering data indicated high electron temperatures within the reconnection layer.

    Conclusions:

    • The experimental results confirm the occurrence of magnetic reconnection in a laser-produced plasma.
    • The identified jets, magnetic fields, and high electron temperatures are consistent with theoretical models of magnetic reconnection.
    • This study provides valuable experimental data for validating simulations and theories of magnetic reconnection in laboratory plasmas.