Temporally resolved target potential measurements in laser-target interactions

Borowitz, Joseph L.; Eliezer, S.; Gazit, Y.; Givon, M.; Jäckel, S.; Ludmirsky, A.; Salzmann, David; Yarkoni, E; Zigler, A.; Arad, B.

doi:10.1088/0022-3727/20/2/010

Cited by 17 publications

(8 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ratio of the total positive target charge to the charge carried by positive ions observed with the FC is of the order of 10 −3 . In contrast with the experiments with nanoseconds to sub-picoseconds lasers (Benjamin et al, 1979;Borowitz et al, 1987), where the time of target charging was comparable with the laser pulse width, in our experiment the positive charge was balanced by a target current during a time period longer by a factor ∼100 in comparison with the laser pulse length. Moreover, a new phenomenon arising after t zero = 2.8 μs indicates that the target is being negatively charged.…”

Section: Resultscontrasting

confidence: 93%

“…The inset shows the corresponding time-resolved FC currents which were transformed to the ion fronts. multi-peak target current occurs (Ludmirsky et al, 1985;Borowitz et al, 1987). Thus, from Figure 3 we can deduce that each double layer reaches a maximum in the charge density ρ(x,t) = e(Zn i − n e ) at the ion front located at a critical distance, x cr from the target, where Z is the ion charge number, n i is the ion density, and n e is the electron density.…”

Section: Resultsmentioning

confidence: 93%

“…The frequency analysis of a peaked structure of target current given in (Borowitz et al, 1987) has been interpreted in terms of the bounce hydrodynamic frequency ω B = (2π/l) eV 0 /M √ , where l is the double-layer thickness, V 0 is the potential across the double layer, and M is the mass of ions. This interpretation is based on the assumption of the existence of a double layer at the critical surface where a movement with the frequency ω B within this double layer is expected.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Characteristics of target polarization by laser ablation

et al. 2015

View full text Add to dashboard Cite

Experimental results are obtained concerning the target polarization, which aptly characterizes the laser ablation. The charge separation in the laser-produced plasma, structure of the ion front, and the current of fast electrons expanding into the vacuum chamber ahead of ions are of crucial importance for the interpretation of multi-peak structure of target currents appearing much later than the laser pulse. Of particular interest is the correlation between the partial maxima in the time-resolved target current and the square root of mass number of ionized species. The late-time negative charging of targets provides evidence for production of very slow ions by ionization of neutrals ablated at the target crater by radiation from plasma produced by 23 ns excimer krypton fluoride laser.Keywords: Target current in laser-produced plasmas; positive and negative target polarization; space structure of ion front

show abstract

Section: Resultscontrasting

confidence: 93%

Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Characteristics of target polarization by laser ablation

et al. 2015

View full text Add to dashboard Cite

show abstract

“…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: 81%

Lorenz Type Behaviors in the Dynamics of Laser Produced Plasma

Irimiciuc¹,

Enescu²,

Agop³

et al. 2019

Symmetry

View full text Add to dashboard Cite

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.

show abstract

“…Target current (TC) is a relatively unexplored phenomenum in the field of laser-matter interaction. The initial studies started in the late seventies [2,3] and continued in a patchy fashion across the following decades [4,5] until recently.…”

Section: Introductionmentioning

confidence: 99%

On the origin of negative target currents during laser ablation of polyethylene

Side

Caricato

Krása

et al. 2018

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. The exposure of a target to a focused laser beam results in the occurrence of a time-varying current between the target itself and the grounded vacuum chamber. This current is composed by three distinct phases, namely the ignition phase, in which the laser pulse drives the electron emission, while electrons coming from the ground through the target holder balance the positive charge generated on the target. The active phase appears at post-pulse times and it is characterized by the presence of peaked structures in the time-resolved current, representing characteristics of the target composition. Lastly, the afterglow phase is determined by a current of electrons flowing from the target to the ground. During the active phase of the target current resulting from polymers ablation with an UV KrF laser, negative target current peaks are observed, whose origin is still unknown. We investigate the dependence of these current structures on the dimensions of the target, using ultra-high molecular weight polyethylene disks of different thickness.

show abstract

Temporally resolved target potential measurements in laser-target interactions

Cited by 17 publications

References 12 publications

Characteristics of target polarization by laser ablation

Characteristics of target polarization by laser ablation

Lorenz Type Behaviors in the Dynamics of Laser Produced Plasma

On the origin of negative target currents during laser ablation of polyethylene

Contact Info

Product

Resources

About