Ion flux enhancements and oscillations in spatially confined laser produced aluminum plasmas

Singh, Subhash C.; Fallon, C.; Hayden, P.; Mujawar, Mubarak; Yeates, P.D.; Costello, J. T.

doi:10.1063/1.4895601

Cited by 19 publications

(14 citation statements)

References 59 publications

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“…We also notice periodic fluctuations (oscillations) on the spatial distribution of all the ionic species. The period of these oscillation are of approximately 900 kHz in good agreement with other reports of ionic oscillations in laser produced plasmas [21,24,28]. The first attempts for the comprehension of this "peculiar" behavior was based on the formation of single or multiple double-layers in the very vicinity of the target.…”

Section: Experimental Confirmationsupporting

confidence: 88%

“…In Figure 2b, we have represented the particle current evolution in time for various scale resolutions. We noticed that the particles present an oscillatory dynamic, as was previously reported by [23] and experimentally proven in [24] and [25]. The frequency changes with the scale resolution, thus we deduce that each component of the plasma might present a different oscillatory behavior dictated by the characteristics of the double layer formed in the area separating the structures.…”

Section: Plasma Modellingsupporting

confidence: 82%

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Lorenz Type Behaviors in the Dynamics of Laser Produced Plasma

Irimiciuc¹,

Enescu²,

Agop³

et al. 2019

Symmetry

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An innovative theoretical model is developed on the backbone of a classical Lorenz system. A mathematical representation of a differential Lorenz system is transposed into a fractal space and reduced to an integral form. In such a conjecture, the Lorenz variables will operate simultaneously on two manifolds, generating two transformation groups, one corresponding to the space coordinates transformation and another one to the scale resolution transformation. Since these groups are isomorphs various types isometries become functional. The Lorenz system was further adapted to describe the dynamics of ejected particles as a result of laser matter interaction in a fractal paradigm. The simulations were focused on the dynamics of charged particles, and showcase the presence of current oscillations, a heterogenous velocity distribution and multi-structuring at different interaction scales. The theoretical predictions were compared with the experimental data acquired with noninvasive diagnostic techniques. The experimental data confirm the multi-structure scenario and the oscillatory behavior predicted by the mathematical model.

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Section: Experimental Confirmationsupporting

confidence: 88%

Section: Plasma Modellingsupporting

confidence: 82%

Lorenz Type Behaviors in the Dynamics of Laser Produced Plasma

Irimiciuc¹,

Enescu²,

Agop³

et al. 2019

Symmetry

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show abstract

“…The flexibility of the technique allowed for some exciting findings. Charged particle oscillations were evidenced with the use of a single cylindrical probe [21], heated probe [12], and multiple probe [22,23] configurations. Their nature is often debated with some reports presenting their roots in the dynamics of a plasma structure generated by electrostatic mechanisms [24], or induced by the transient double layers generated through plasma structuring [25].…”

Section: Introductionmentioning

confidence: 99%

Charged Particle Oscillations in Transient Plasmas Generated by Nanosecond Laser Ablation on Mg Target

et al. 2020

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The dynamics of a transient plasma generated by laser ablation on a Mg target was investigated by means of the Langmuir probe method and fractal analysis. The empirical data showcased the presence of an oscillatory behavior at short expansion times (<1 μs) characterized by two oscillation frequencies and a classical behavior for longer evolution times. Space- and time-resolved analysis was implemented in order to determine main plasma parameters like the electron temperature, plasma potential, or charged particle density. In the motion fractal paradigm, a theoretical model was built for the description of laser-produced plasma dynamics expressed through fractal-type equations. The calibration of such dynamics was performed through a fractal-type tunneling effect for physical systems with spontaneous symmetry breaking. This allows both the self-structuring of laser-produced plasma in two structures based on its separation on different oscillation modes and the determination of some characteristics involved in the self-structuring process. The mutual conditionings between the two structures are given as joint invariant functions on the action of two isomorph groups of SL(2R) type through the Stoler-type transformation, explicitly given through amplitude self-modulation.

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“…When extracting the oscillatory part from the original signal ( Figure 2), that is, subtracting the smoothed temporal trace, the resulted time-dependence revealed a good fitting with a usual damp oscillator [48,60]. Thus, one can assume that in the electric field near the probe the ion equation of motion is…”

Section: Resultsmentioning

confidence: 99%

Experimental and Theoretical Studies on the Dynamics of Transient Plasmas Generated by Laser Ablation in Various Temporal Regimes

Nica¹,

Irimiciuc²,

Agop³

et al. 2017

Laser Ablation - From Fundamentals to Applications

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During the last decade, our groups have performed systematic experimental studies on the characterization of plasma plumes generated by laser ablation in various temporal regimes (ns, ps, fs) on materials ranging from simple metals (Al, Cu, Mn, Ni, In, W, …) to more complex compounds (ceramics, chalcogenide glasses, ferrites). Optical (fast imaging and space-and time-resolved emission spectroscopy) and electrical (mainly Langmuir probe) methods have been applied to experimentally investigate the dynamics of the plasma plume and its constituents. Influence of the target physical (thermodynamic and electrical) parameters on the plasma dynamics has been studied. A mathematical correlation between the local and global plasma parameters and the physical properties of the target was proposed for the first time. Peculiar behaviors like plume splitting or plasma oscillations have been evidenced for high laser fluence ablation in vacuum. Along with results from the literature, our findings provide convincing arguments for the existence of multiple double-layers in the laser ablation plasma plume, in a scenario including two-temperature electrons. New fractal-based theoretical approaches have been developed to qualitatively and quantitatively account for the observed phenomena. The space and time evolution of expansion velocity, particle number, current density and plasma temperature were theoretically investigated.

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Ion flux enhancements and oscillations in spatially confined laser produced aluminum plasmas

Cited by 19 publications

References 59 publications

Lorenz Type Behaviors in the Dynamics of Laser Produced Plasma

Lorenz Type Behaviors in the Dynamics of Laser Produced Plasma

Charged Particle Oscillations in Transient Plasmas Generated by Nanosecond Laser Ablation on Mg Target

Experimental and Theoretical Studies on the Dynamics of Transient Plasmas Generated by Laser Ablation in Various Temporal Regimes

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