Effects of a static inhomogeneous magnetic field acting on a laser-produced carbon plasma plume

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 μ m, with a fluence of 7 J/cm2, is used to generate...

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Bibliographic Details
Published in:AIP advances 2017-08, Vol.7 (8), p.085002-085002-11
Main Authors: Favre, M., Ruiz, H. M., Bendixsen, L. S. Caballero, Reyes, S., Veloso, F., Wyndham, E., Bhuyan, H.
Format: Article
Language:English
Subjects:
Carbon
Ion flux
Larmor radius
Lasers
Low pressure
Magnetic fields
Magnets
Neodymium lasers
Neutral gases
Optical emission spectroscopy
Plasma
Semiconductor lasers
YAG lasers
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Summary: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 μ m, 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 C 2 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.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4995527