Confinement and dynamics of laser-produced plasma expanding across a transverse magnetic field

Harilal, S. S.; Tillack, M. S.; O'Shay, B; Bindhu, C. V.; Najmabadi, F.

doi:10.1103/physreve.69.026413

Cited by 197 publications

(134 citation statements)

References 38 publications

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“…However, with a background magnetic field transverse to the blow-off direction, several new phenomena come into play, including plume confinement, plasma instabilities, and the conversion of plasma kinetic to thermal energy. Harilal et al [29] have seen electron heating at the edge of a laser-driven plasma expanding into a magnetic field and have argued that electron cooling can be retarded due to resistive Ohmic heating and adiabatic compression by the magnetic field. Similar conditions appear to be in effect here, though over a larger spatial and temporal scale (see also [30]).…”

Section: Resultsmentioning

confidence: 99%

Thomson Scattering Measurements of Temperature and Density in a Low-Density, Laser-Driven Magnetized Plasma

et al. 2012

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We present electron temperature and density measurements from Thomson scattering on recent collisionless shock experiments on the Trident laser at Los Alamos National Laboratory. A graphite target placed inside a static magnetic field ( 1 kG) created by a 50 cm-diameter Helmholtz coil was ablated by a 1053 nm beam, which created a low-density, magnetized plasma. A separate 527 nm beam was used for Thomson scattering to characterize the plasma 3 cm radially from the target and 0.5 − 8.5 µs after ablation. The electron temperature was found to be relatively constant over 8 µs at 11 − 13 eV and, combined with Rayleigh scattering, the electron density was found to be 2 × 10 14 − 4 × 10 14 cm −3 over the same timescale. Several carbon emission lines were also observed in the Thomson spectrum and were utilized to independently measure the electron temperature and density and to characterize the plasma charge state.

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Section: Resultsmentioning

confidence: 99%

Thomson Scattering Measurements of Temperature and Density in a Low-Density, Laser-Driven Magnetized Plasma

et al. 2012

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“…[21][22][23][24][25] This capability becomes essential for a hydrodynamic understanding of the plume propagation and reactive scattering. Plasma emission begins on the target surface soon after the laser photons reach the surface.…”

Section: Resultsmentioning

confidence: 99%

Influence of spot size on propagation dynamics of laser-produced tin plasma

Harilal¹

2007

Journal of Applied Physics

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The plume dynamics in the presence of an ambient gas is very intriguing physics. The expansion of a laser-produced plasma in the presence of an ambient gas leads to internal plume structures, plume splitting, sharpening, confinement, etc. We investigated propagation dynamics of an expanding tin plume for various spot sizes using a fast visible plume imaging and Faraday cup diagnostic tools. Our results indicate that the sharpening of the plume depends strongly on the spot size. With a smaller spot size, the lateral expansion is found to be higher and the plume expansion is spherical while with a larger spot size the plume expansion is more cylindrical. Analysis of time resolved imaging also showed internal structures inside the plume.

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“…Rai et al [7] studied the emission properties of LPP from both solid and liquid targets expanding across a magnetic field with the aim of enhancing the sensitivity of the LIBS system. Both Harilal et al [8] and L. Dirnberger et al [9] also studied the expansion of LPP across a magnetic field and observed enhanced emission from ionized species. This was qualitatively explained in terms of a magnetohydrodynamic (MHD) model of the interaction of the moving plasma with the field.…”

Section: Introductionmentioning

confidence: 99%

Lateral confinement of laser ablation plasma in magnetic field

Pagano¹,

Lunney²

2010

J. Phys. D: Appl. Phys.

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Abstract. The expansion of copper laser produced plasma along a magnetic field was investigated with the aim of confining the lateral expansion of the plasma. Time-resolved optical imaging, time-and space-resolved optical emission spectroscopy and time-of-flight Langmuir ion probe measurements were used to study the plasma dynamics. Thin films of copper were deposited without, and with, the magnetic field. It was observed that the magnetic field gives rise to substantial confinement of the plasma, leading to an increase by a factor of 6 in the ion yield and 2.6 in the deposition rate.

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Confinement and dynamics of laser-produced plasma expanding across a transverse magnetic field

Cited by 197 publications

References 38 publications

Thomson Scattering Measurements of Temperature and Density in a Low-Density, Laser-Driven Magnetized Plasma

Thomson Scattering Measurements of Temperature and Density in a Low-Density, Laser-Driven Magnetized Plasma

Influence of spot size on propagation dynamics of laser-produced tin plasma

Lateral confinement of laser ablation plasma in magnetic field

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