Measurement of the target current by inductive probe during laser interaction on terawatt laser system PALS

Cikhardt, J.; Krása, J.; Marco, Massimo De; Pfeifer, M.; Velyhan, A.; Krouský, E.; Cikhardtová, B.; Klír, D.; Řezáč, K.; Ullschmied, J.; Skála, J.; Kubes, P.; Kravárik, J.

doi:10.1063/1.4898016

Cited by 44 publications

(65 citation statements)

References 21 publications

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“…The voltage pulse appears on isolated targets independently of the laser pulse duration. The positive charging of the target is balanced by an opposing current which can reach a peak value up to a few kA (Benjamin et al, 1979;Cikhardt et al, 2014). It is supposed that the positive charging of the target results from high-energy electrons leaving the plasma and traveling a distance either until their kinetic energy equals the electric field energy of charge separation or until they strike the vacuum chamber walls (Crow et al, 1975;Eliezer & Hora, 1989;Dubois et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…The measurements of the target polarization and the target return current versus laser intensity and target properties give information on escaping electrons generated in the interaction of laser pulses with solid targets (Mendel & Olsen, 1975;Pearlman & Dahlbacka, 1977;Benjamin et al, 1979;Bialkowski et al, 1990;Cikhardt et al, 2014;Dubois et al, 2014). The voltage pulse appears on isolated targets independently of the laser pulse duration.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of target polarization by laser ablation

et al. 2015

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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

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characteristics of target polarization by laser ablation

et al. 2015

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“…The additional data obtained in previous PALS experiments were attracted for the analysis, namely, the total electric currents in the target support measured in Ref. 26 and the electron spectra in the range from few hundred keV up to 3 MeV measured in Ref. 27.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

Kinetic magnetization by fast electrons in laser-produced plasmas at sub-relativistic intensities

et al. 2017

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The problem of spontaneous magnetic field generation with nanosecond laser pulses raises a series of fundamental questions, including the intrinsic magnetization mechanisms in laser-driven plasmas and the understanding of charge-discharge processes in the irradiated target. These two issues are tightly bound as the charge-discharge processes are defined by the currents, which have in turn a feedback by magnetic fields in the plasma. Using direct polaro-interferometric measurements and theoretical analysis, we show that at parameters related to the PALS laser system (1.315 μm, 350 ps, and 1016 W/cm2), fast electrons play a decisive role in the generation of magnetic fields in the laser-driven plasma. Spatial distributions of electric currents were calculated from the measured magnetic field and plasma density distributions. The obtained results revealed the characteristics of strong currents observed in capacitor-coil magnetic generation schemes and open a new approach to fundamental studies related to magnetized plasmas.

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“…1. A new type of an inductive target probe (T-probe) was used to obtain high-resolution magnetic fl ux derivative signals that are subsequently integrated to give the target return currents [8]. The T-probe is a small inductive loop probe being a part of the target manipulator, used to measure transient return current that balances the defi cit of electrons in the laser spot created on a target.…”

Section: Experimental Arrangementmentioning

confidence: 99%

Electromagnetic pulses produced by expanding laser-produced Au plasma

et al. 2015

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Abstract. The interaction of an intense laser pulse with a solid target produces large number of fast free electrons. This emission gives rise to two distinct sources of the electromagnetic pulse (EMP): the pulsed return current through the holder of the target and the outfl ow of electrons into the vacuum. A relation between the characteristics of laser-produced plasma, the target return current and the EMP emission are presented in the case of a massive Au target irradiated with the intensity of up to 3 × 10 16 W/cm 2 . The emission of the EMP was recorded using a 12 cm diameter Moebius loop antennas, and the target return current was measured using a new type of inductive target probe (T-probe). The simultaneous use of the inductive target probe and the Moebius loop antenna represents a new useful way of diagnosing the laser-matter interaction, which was employed to distinguish between laser-generated ion sources driven by low and high contrast laser pulses.

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Measurement of the target current by inductive probe during laser interaction on terawatt laser system PALS

Cited by 44 publications

References 21 publications

Characteristics of target polarization by laser ablation

Characteristics of target polarization by laser ablation

Kinetic magnetization by fast electrons in laser-produced plasmas at sub-relativistic intensities

Electromagnetic pulses produced by expanding laser-produced Au plasma

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