Direct Observation of Strong Ion Coupling in Laser-Driven Shock-Compressed Targets

Ravasio, A.; Gregori, G.; Benuzzi‐Mounaix, A.; Daligault, Jérôme; Delserieys, Alice; Faenov, A. Ya.; Loupias, B.; Ozaki, Norimasa; Gloahec, M. Rabec Le; Pikuz, T. A.; Riley, David; Kœnig, M.

doi:10.1103/physrevlett.99.135006

Cited by 51 publications

(24 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is obtained by adjusting the effective laser intensity in the simulations to reproduce the shock velocity measured with the VISAR and the shock arrival time measured by the VISAR and SOP (see figure 2). This method has been validated previously in various experimental works [28,29]. In the present case, we find an average effective intensity of 9.10 12 W/cm 2 for shots using two beams (14 J in total).…”

Section: Determination Of the Probed Thermodynamic Conditionssupporting

confidence: 79%

X-ray absorption spectroscopy of iron at multimegabar pressures in laser shock experiments

Harmand¹,

Ravasio²,

Mazevet³

et al. 2015

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

International audienceTaking advantage of the new opportunities provided by x-ray free electron laser (FEL) sources when coupled to a long laser pulse as available at the Linear Coherent Light Source (LCLS), we have performed x-ray absorption near-edge spectroscopy (XANES) of laser shock compressed iron up to 420 GPa (±50) and 10 800 K (±1390). Visible diagnostics coupled with hydrodynamic simulations were used to infer the thermodynamical conditions along the Hugoniot and the release adiabat. A modification of the pre-edge feature at 7.12 keV in the XANES spectra is observed above pressures of 260 GPa along the Hugoniot. Comparing with ab initio calculations and with previous laser-heated diamond cell data, we propose that such changes in the XANES pre-edge could be a signature of molten iron. This interpretation then suggests that iron is molten at pressures and temperatures higher than 260 GPa (±29) and 5680 K (±700) along the principal Fe Hugoniot

show abstract

Section: Determination Of the Probed Thermodynamic Conditionssupporting

confidence: 79%

X-ray absorption spectroscopy of iron at multimegabar pressures in laser shock experiments

Harmand¹,

Ravasio²,

Mazevet³

et al. 2015

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

show abstract

“…Precise structural information is also needed for the interpretation of x-ray diffraction measurments [5], the newly developed diagnostics by means of spectrally resolved x-ray Thomson scattering [6][7][8][9][10], and the elastic scattering measurements presented in Ref. [11].…”

Section: Introductionmentioning

confidence: 99%

Structure of strongly coupled multicomponent plasmas

et al. 2008

View full text Add to dashboard Cite

We investigate the short range structure in strongly coupled, fluid-like plasmas using the hypernetted chain approach generalized to multi-component systems. Good agreement with numerical simulations validates this method for the parameters considered. We found strong mutual impact on the spacial arrangement for systems with multiple ion species which were most clearly pronounced in the static structure factor. Quantum pseudo-potentials were used to mimic diffraction and exchange effects in dense electron-ion systems. We demonstrate that the different kinds of pseudo-potentials proposed lead to large differences in both the pair distributions and the structure factors. Large discrepancies were also found in the predicted ion feature of the x-ray scattering signal illustrating the need for comparison with full quantum calculations or experimental verification.

show abstract

“…As of yet, most experimental studies focus on the long-term evolution of ion heating on the order of several hundred picoseconds to nanoseconds [7][8][9][10] . This is due to the fact that heating a significant part of all ions in a solid-density target to temperatures of several hundred eV is usually only possible using high-energy laser pulses of several hundred Joule and picosecond to nanosecond time scale.…”

Section: Introductionmentioning

confidence: 99%

Ion heating dynamics in solid buried layer targets irradiated by ultra-short intense laser pulses

et al. 2013

View full text Add to dashboard Cite

We investigate bulk ion heating in solid buried layer targets irradiated by ultra-short laser pulses of relativistic intensities using particle-in-cell simulations. Our study focuses on a CD 2 -Al-CD 2 sandwich target geometry. We find enhanced deuteron ion heating in a layer compressed by the expanding aluminium layer. A pressure gradient created at the Al-CD 2 interface pushes this layer of deuteron ions towards the outer regions of the target. During its passage through the target, deuteron ions are constantly injected into this layer. Our simulations suggest that the directed collective outward motion of the layer is converted into thermal motion inside the layer, leading to deuteron temperatures higher than those found in the rest of the target. This enhanced heating can already be observed at laser pulse durations as low as 100 femtoseconds. Thus, detailed experimental surveys at repetition rates of several ten laser shots per minute are in reach at current high-power laser systems, which would allow for probing and optimizing the heating dynamics.

show abstract

Direct Observation of Strong Ion Coupling in Laser-Driven Shock-Compressed Targets

Cited by 51 publications

References 28 publications

X-ray absorption spectroscopy of iron at multimegabar pressures in laser shock experiments

X-ray absorption spectroscopy of iron at multimegabar pressures in laser shock experiments

Structure of strongly coupled multicomponent plasmas

Ion heating dynamics in solid buried layer targets irradiated by ultra-short intense laser pulses

Contact Info

Product

Resources

About