Pre-plasma effect on energy transfer from laser beam to shock wave generated in solid target

Pisarczyk, T.; Gus'kov, Sergei Yu; Kalinowska, Z.; Badziak, J.; Batani, D.; Antonelli, L.; Folpini, Giulia; Maheut, Y.; Baffigi, F.; Borodziuk, S.; Chodukowski, T.; Cristoforetti, G.; Demchenko, N. N.; Gizzi, L. A.; Kasperczuk, A.; Koester, P.; Krouský, E.; Labate, L.; Parys, P.; Pfeifer, M.; Renner, O.; Šmíd, Michal; Rosiński, M.; Skála, J.; Dudžák, R.; Ullschmied, J.; Pisarczyk, P.

doi:10.1063/1.4862784

Cited by 23 publications

(13 citation statements)

References 12 publications

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“…In comparison with our previous papers (Gus 'kov et al, 2014;Pisarczyk et al, 2014), here we report the results benefitting from the application of modified complex diagnostics which provide additional knowledge on the role of fast electron energy transfer in the process of the plasma production under the conditions of one-and two-beam laser irradiation.…”

Section: Introductionmentioning

confidence: 84%

“…Similar to (Koester et al, 2013;Batani et al, 2014a;Pisarczyk et al, 2014), the experiments were performed using Cu massive planar targets covered by 25 μm plastic layer (C 8 H 7 Cl), which were irradiated by the 1ω laser beam (λ = 1.315 μm) at the energy of 250 J. Structure and irradiation geometry of the two-layer target are presented in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

“…According to our previous papers (Gus 'kov et al, 2014;Pisarczyk et al, 2014), this corresponds directly to the energy transfer into the target by fast electrons generated due to resonant absorption. However, the crater creation efficiency also grows in the range of the focal spot radii larger than R L = 150 μm.…”

Section: Crater Volume Measurementsmentioning

confidence: 99%

“…In our previous papers (Kalinowska et al, 2012;Gus'kov et al, 2014;Pisarczyk et al, 2014), it has been shown that the interferometric measurements in combination with the crater volume analysis can provide essential information about mechanisms of the laser radiation absorption. The ratio N/V cr (where N is the total electron number in the plasma plume and V cr is the crater volume in cm 3 ) defines a number of thermal electrons participating in the creation of crater volume unit (1 cm 3 ).…”

Section: Crater Volume Measurementsmentioning

confidence: 99%

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Pre-plasma effect on laser beam energy transfer to a dense target under conditions relevant to shock ignition

et al. 2015

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This paper reports on properties of a plasma formed by sequential action of two laser beams on a flat target, simulating the conditions of shock-ignited inertial confinement fusion target exposure. The experiments were performed using planar targets consisting of a massive copper (Cu) plate coated with a thin plastic (CH) layer, which was irradiated by the 1ω PALS laser beam (λ = 1.315 μm) at the energy of 250 J. The intensity of the fixed-energy laser beam was scaled by varying the focal spot radius. To imitate shock ignition conditions, the lower-intensity auxiliary 1ω beam created CHpre-plasma which was irradiated by the main beam with a delay of 1.2 ns, thus generating a shock wave in the massive part of the target. To study the parameters of the plasma treated by the two-beam irradiation of the targets, a set of various diagnostics was applied, namely: (i) Two-channel polaro-interferometric system irradiated by the femtosecond laser (∼40 fs), (ii) spectroscopic measurements in the X-ray range, (iii) two-dimensional (2D)-resolved imaging of the K α line emission from Cu, (iv) measurements of the ion emission by means of ion collectors, and (v) measurements of the volume of craters produced in a massive target providing information on the efficiency of the laser energy transfer to the shock wave. The 2D numerical simulations have been used to support the interpretation of experimental data. The general conclusion is that the fraction of the main laser beam energy deposited into the massive copper at twobeam irradiation decreases in comparison with the case of pre-plasma. The reason is that the pre-formed and expanding plasma deteriorates the efficiency of the energy transfer from the main laser pulse to a solid part of the targets by means of the fast electrons and the wave of an electron thermal conductivity.

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Section: Introductionmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Section: Crater Volume Measurementsmentioning

confidence: 99%

Section: Crater Volume Measurementsmentioning

confidence: 99%

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Pre-plasma effect on laser beam energy transfer to a dense target under conditions relevant to shock ignition

et al. 2015

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“…Previous experiments performed under these conditions determined the fraction of the resonantly absorbed energy up to 5% of the total laser energy, while the fast electron energy was about 100 keV. 20,21 For the SMF measurements, we used the optical diagnostics based on the Faraday effect 22 (rotation of the polarization plane) in combination with the measurement of the electron density distribution implemented earlier on the PALS system. 23 Among many methods used for the magnetic field measurement in the laser-driven plasma, such as proton deflectometry, direct B-dot, and optical techniques, this one allows to obtain probably the most complete information about the magnetic field, in particular, its spatial and temporal distribution, though only in the transparent area of the investigated plasma.…”

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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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Studies of ablated plasma and shocks produced in a planar target by a sub-nanosecond laser pulse of intensity relevant to shock ignition

et al. 2015

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The effect of laser intensity on characteristics of the plasma ablated from a low-Z (CH) planar target irradiated by a 250 ps, 0.438 µm laser pulse with the intensity of up to 1016 W/cm2 as well as on parameters of the laser-driven shock generated in the target for various scale-lengths of preformed plasma was investigated at the kilojoule Prague Asterix Laser System (PALS) laser facility. Characteristics of the plasma were measured with the use of 3-frame interferometry, ion diagnostics, an X-ray spectrometer, and Kα imaging. Parameters of the shock generated in a Cl doped CH target by the intense 3ω laser pulse were inferred by numerical hydrodynamic simulations from the measurements of craters produced by the shock in the massive Cu target behind the CH layer. It was found that the pressure of the shock generated in the plastic layer is relatively weakly influenced by the preplasma (the pressure drop due to the preplasma presence is ~10–20%) and at the pulse intensity of ~1016 W/cm2 the maximum pressure reaches ~80–90 Mbar. However, an increase in pressure of the shock with the laser intensity is slower than predicted by theory for a planar shock and the maximum pressure achieved in the experiment is by a factor of ~2 lower than predicted by the theory. Both at the preplasma absence and presence, the laser-to-hot electrons energy conversion efficiency is small, ~1% or below, and the influence of hot electrons on the generated shock is expected to be weak.

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Pre-plasma effect on energy transfer from laser beam to shock wave generated in solid target

Cited by 23 publications

References 12 publications

Pre-plasma effect on laser beam energy transfer to a dense target under conditions relevant to shock ignition

Pre-plasma effect on laser beam energy transfer to a dense target under conditions relevant to shock ignition

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

Studies of ablated plasma and shocks produced in a planar target by a sub-nanosecond laser pulse of intensity relevant to shock ignition

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