Open AccessEffects of a static inhomogeneous magnetic field acting on a laser-produced carbon plasma plume
Author(s) -
M. Favre,
H. M. Ruiz,
L. S. Caballero Bendixsen,
Sebastian Reyes,
Felipe Veloso,
E. Wyndham,
H. Bhuyan
Publication year - 2017
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4995527
Subject(s) - plasma , magnetic field , atomic physics , plasma diagnostics , gyroradius , laser , coaxial , materials science , optics , physics , electrical engineering , quantum mechanics , engineering
We present time- and space-resolved observations of the dynamics of a laser-produced carbon plasma, propagating in a sub-Tesla inhomogeneous magnetic field, with both, axial and radial field gradients. An Nd:YAG laser pulse, 340 mJ, 3.5 ns, at 1.06 μm, with a fluence of 7 J/cm2, is used to generate the plasma from a solid graphite target, in vacuum. The magnetic field is produced using two coaxial sets of two NeFeB ring magnets, parallel to the laser target surface. The diagnostics include plasma imaging with 50 ns time resolution, spatially resolved optical emission spectroscopy and Faraday cup. Based on our observations, evidence of radial and axial plasma confinement due to magnetic field gradients is presented. Formation of C2 molecules, previously observed in the presence of a low pressure neutral gas background, and enhanced on-axis ion flux, are ascribed to finite Larmor radius effects and reduced radial transport due to the presence of the magnetic field
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