Two-dimensional hydrodynamic models of laser-produced plasmas

Pert, G.J.

doi:10.1017/s0022377800013854

Cited by 35 publications

(18 citation statements)

References 20 publications

(15 reference statements)

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“…29, for more details), which includes laser absorption via inverse Bremsstrahlung and thermal electron transport via flux-limited Spitzer-Harm conductivity. A 3 ns FWHM Gaussian ASE pedestal, at different intensities onto the target, was considered.…”

Section: Experimental and Numerical Resultsmentioning

confidence: 99%

X-ray conversion of ultra-short laser pulses on a solid sample: Role of electron waves excited in the pre-plasma

et al. 2014

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Flat silicon samples were irradiated with 40 fs, 800 nm laser pulses at an intensity at the best focus of 2·1018 Wcm−2, in the presence of a pre-plasma on the sample surface. X-ray emission in the spectral range from 2 to 30 keV was detected inside and outside the plane of incidence, while varying pre-plasma scale length, laser intensity, and polarization. The simultaneous detection of 2ω and 3ω/2 emission allowed the contributions to the X-ray yield to be identified as originating from laser interaction with either the near-critical density (nc) region or with the nc/4 region. In the presence of a moderate pre-plasma, our measurements reveal that, provided the pre-plasma reaches a scale-length of a few laser wavelengths, X-ray emission is dominated by the contribution from the interaction with the under dense plasma, where electron plasma waves can grow, via laser stimulated instabilities, and, in turn, accelerate free electrons to high energies. This mechanism leads also to a clear anisotropy in the angular distribution of the X-ray emission. Our findings can lead to an enhancement of the conversion efficiency of ultra short laser pulses into X-rays.

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Section: Experimental and Numerical Resultsmentioning

confidence: 99%

X-ray conversion of ultra-short laser pulses on a solid sample: Role of electron waves excited in the pre-plasma

et al. 2014

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“…24 The code incorporates a comprehensive equation of state model, with relevant phase transitions. For plasmas, the distribution of ions is modelled by local thermodynamic equilibrium (LTE) including ionization potential depression and used to calculate the opacity due to photoionization and inverse bremsstrahlung.…”

Section: Target Hydrodynamicsmentioning

confidence: 99%

Ablation and transmission of thin solid targets irradiated by intense extreme ultraviolet laser radiation

et al. 2016

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The interaction of an extreme ultraviolet (EUV) laser beam with a parylene foil was studied by experiments and simulation. A single EUV laser pulse of nanosecond duration focused to an intensity of 3 × 1010 W cm−2 perforated micrometer thick targets. The same laser pulse was simultaneously used to diagnose the interaction by a transmission measurement. A combination of 2-dimensional radiation-hydrodynamic and diffraction calculations was used to model the ablation, leading to good agreement with experiment. This theoretical approach allows predictive modelling of the interaction with matter of intense EUV beams over a broad range of parameters.

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“…The 2D Eulerian hydrodynamic code POLLUX [9,10], written at the University of York, was originally developed to model moderate irradiance (≥10…”

Section: Hydrodynamic Codementioning

confidence: 99%

Generation of warm dense matter using an argon based capillary discharge laser

Rossall

Tallents

2015

High Energy Density Physics

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Argon based capillary discharge lasers operating in the extreme ultra violet (EUV) at 46.9 nm output up to 0.5 mJ energy per pulse at up to 10 Hz repetition rates are capable of focussed irradiances of 10 9 -10 12 W cm −2 and can be used to generate plasma in the warm dense matter regime by irradiating solid material. To model the interaction between such an EUV laser and solid material, the 2D radiative-hydrodynamic code POLLUX has been modified to include absorption via direct photo-ionisation, a super-configuration model to describe the ionisation dependant electronic configurations and a calculation of plasma refractive indices for ray tracing of the incident EUV laser radiation. A simulation study is presented, demonstrating how capillary discharge lasers of 1200 ps pulse duration can be used to generate warm dense matter at close to solid densities with temperatures of a few eV and energy densities up to 1 × 10 5 J cm −3 . Plasmas produced by EUV laser irradiation are shown to be useful for examining the properties of warm dense matter as, for example, plasma emission is not masked by hotter, less dense plasma emission as occurs with visible/infra-red laser target irradiation.

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Two-dimensional hydrodynamic models of laser-produced plasmas

Cited by 35 publications

References 20 publications

X-ray conversion of ultra-short laser pulses on a solid sample: Role of electron waves excited in the pre-plasma

X-ray conversion of ultra-short laser pulses on a solid sample: Role of electron waves excited in the pre-plasma

Ablation and transmission of thin solid targets irradiated by intense extreme ultraviolet laser radiation

Generation of warm dense matter using an argon based capillary discharge laser

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