Ablation pressure scaling at short laser wavelength

Batani, D.; Stabile, H.; Ravasio, A.; Lucchini, G.; Strati, F.; Desai, T.; Ullschmied, J.; Krousky, E.; Skála, J.; Juha, L.; Králíková, B.; Pfeifer, M.; Kadlec, C.; Mocek, Tomáš; Präg, A. R.; Nishimura, Hiroaki; Ochi, Yoshihiro

doi:10.1103/physreve.68.067403

Cited by 56 publications

(21 citation statements)

References 45 publications

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“…The laser ablation pressure is obtained from scaling laws from Ref. [30]. At a prepulse intensity of 2.5 Â 10 13 W/cm 2 we estimate p 1 z 4 Mbar, resulting in an energy density of 100 MJ/kg.…”

Section: Spectral Shiftsmentioning

confidence: 99%

Isochoric heating of reduced mass targets by ultra-intense laser produced relativistic electrons

Neumayer

Lee

Offerman

et al. 2009

High Energy Density Physics

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a b s t r a c tWe present measurements of the chlorine K-alpha emission from reduced mass targets, irradiated with ultra-high intensity laser pulses. Chlorinated plastic targets with diameters down to 50 mm and mass of a few 10 À8 g were irradiated with up to 7 J of laser energy focused to intensities of several 10 19 W/cm 2 . The conversion of laser energy to K-alpha radiation is measured, and high-resolution spectra that allow observation of line shifts are observed, indicating isochoric heating of the target up to 18 eV. A zerodimensional 2-temperature equilibration model, combined with electron impact K-shell ionization and post processed spectra from collisional radiative calculations reproduces the observed K-alpha yields and line shifts, and shows the importance of target expansion due to the hot electron pressure.

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Section: Spectral Shiftsmentioning

confidence: 99%

Isochoric heating of reduced mass targets by ultra-intense laser produced relativistic electrons

Neumayer

Lee

Offerman

et al. 2009

High Energy Density Physics

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“…Such velocities correspond to shock pressures of less than 10 Mbar. This is much lower than the ablation pressure expected on the front side on the basis of scaling laws reported in the scientific literature (34)(35)(36)(37)(38). Indeed, the value measured at the rear side of the target is much lower than the ablative pressure produced during the laser interaction.…”

Section: Shock Chronometrymentioning

confidence: 63%

Studies on laser–plasma interaction physics for shock ignition

Maheut

Batani

Nicolaï

et al. 2015

Radiation Effects and Defects in Solids

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We realized a series of experiments to study the physics of laser-plasma interaction in an intensity regime of interest for the novel "Shock Ignition" approach to Inertial Fusion. Experiments were performed at the Prague Asterix Laser System laser in Prague using two laser beams: an "auxiliary" beam, for pre-plasma creation, with intensity around 7 × 10 13 W/cm 2 (250 ps, 1ω, λ = 1315 nm) and the "main" beam, up to 10 16 W/cm (250 ps, 3ω, λ = 438 nm), to launch a shock. The main goal of these experiments is to study the process of the formation of a very strong shock and the influence of hot electrons in the generation of very high pressures. The shock produced by the ablation of the plastic layer is studied by shock breakout chronometry. The generation of hot electrons is analyzed by imaging Kα emission.

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“…This shows top view of the crater and the internal Figure 3. In this case, laser energy on the target was ∼3.64 J corresponding to intensity ∼8 × 10 12 W/cm 2 and a shock pressure ∼3 Mbar (11,12). Effect of such pressure on the central uplift is not clear at present, and it is an interesting issue for further investigation.…”

Section: Resultsmentioning

confidence: 91%

High-power laser ablation and planetary events

Desai

Batani

Bussoli

et al. 2008

Radiation Effects and Defects in Solids

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Here we report an experimental study on laser-produced craters using our facility at Milano-Bicocca at low-laser energy and at PALS, Prague, at higher energy to study the possibility of laboratory craters to investigate the planetary events such as meteorite craters. An aluminium foil (100 μm thick) of density 2.7 g/cc, which could model the earth crest (density∼2.67 g/cc), was used as a target. We measured the diameter and depth of the laboratory craters by adopting different techniques viz. laser scanning confocal microscope, focused ion beam and scanning electron microscope for the accuracy of the measurements. We obtained two types of craters in the laboratory viz. simple, which are circular, bowl-shaped depressions with depth-to-diameter ratio ∼ 1:5, and intricate structures resembling complex craters produced due to large meteorites impact on earth and other planets. The contours from the laser-ablated craters could represent the natural meteorite craters on the earth and elsewhere on other terrestrial surfaces.

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Ablation pressure scaling at short laser wavelength

Cited by 56 publications

References 45 publications

Isochoric heating of reduced mass targets by ultra-intense laser produced relativistic electrons

Isochoric heating of reduced mass targets by ultra-intense laser produced relativistic electrons

Studies on laser–plasma interaction physics for shock ignition

High-power laser ablation and planetary events

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