The Interaction of High-Power Lasers with Plasmas

Eliezer, S.

doi:10.1887/0750307471

Cited by 236 publications

(80 citation statements)

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“…Asymmetric irradiation and/or rough surface finishes can lead to a nonuniform ablation process, and thus to the generation of perturbed shock waves. The presence of distorted fronts in ICF pellets is significant because of their potential for seeding hydrodynamic instabilities (via "interface imprinting" [9] or otherwise [10]), which disturb uniform highdensity compression and reduce gain. A better understanding of the dynamics of perturbed shocks in real materials could provide insight into how to suppress these instabilities, thus improving the overall uniformity of the compression process.…”

Section: Introductionmentioning

confidence: 99%

Initial-value-problem solution for isolated rippled shock fronts in arbitrary fluid media

Bates

2004

Phys. Rev. E

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Following the work of Roberts (Los Alamos Scientific Laboratory Report No. LA-299, 1945), we investigate the effect of small two-dimensional perturbations on an isolated, planar shock front moving steadily through an inviscid fluid medium with an arbitrary equation of state (EOS). In the context of an initial-value problem, we derive explicit analytical expressions for the linearized, time-dependent Fourier coefficients associated with an initial corrugation of the front. The temporal evolution of these coefficients superficially resembles the attenuated "ringing" of a damped harmonic oscillator, but with the important distinctions that the frequency of oscillation is not constant, and that the damping factor is not simply an exponential function of time t. It is shown that at least two three-parameter families of stable solutions exist, one more strongly damped than the other. In both cases, we find that the envelope of oscillations decays asymptotically as t −3/2 , with shorter wavelengths dying out earlier than longer ones. For a particular perturbedshock system, the strength of the front and the EOS properties of the material through which it propagates determine the applicable family of solutions. Theoretical predictions agree well with FAST2D numerical simulations for several examples derived from the CALEOS library. Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. In the context of an initial-value problem, we derive explicit analytical expressions for the linearized, time-dependent Fourier coefficients associated with an initial corrugation of the front. The temporal evolution of these coefficients superficially resembles the attenuated inging" of a damped harmonic oscillator, but with the important distinctions that the frequency of oscillation is not constant, and that the damping factor is not simply an exponential function of time t. It is shown that at least two three-parameter families of stable solutions exist, one more strongly damped than the other. In both cases, we find that the envelope of oscillations decays asymptotically as t-3=2, with shorter wavelengths dying out earlier than longer ones. For a particular perturbedshock system, the strength of the front and the EOS properties of the material through which it propagates d...

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Section: Introductionmentioning

confidence: 99%

Initial-value-problem solution for isolated rippled shock fronts in arbitrary fluid media

Bates

2004

Phys. Rev. E

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“…Most of the light coupling in femtosecond laser interactions occurs essentially at the critical surface where strong plasma oscillations can be excited [4,5]. Giant magnetic fields are found around this surface [6], and relativistic oscillations of this surface can up-shift incident light to higher-order harmonic, attosecond pulses [7].…”

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confidence: 99%

Doppler Spectrometry for Ultrafast Temporal Mapping of Density Dynamics in Laser-Induced Plasmas

et al. 2010

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We present high resolution measurements of the ultrafast temporal dynamics of the critical surface in moderately overdense, hot plasma by using two-color, pump-probe Doppler spectrometry. Our measurements clearly capture the initial inward motion of the plasma inside the critical surface of the pump laser which is followed by outward expansion. The measured instantaneous velocity and acceleration profiles are very well reproduced by a hybrid simulation that uses a 1D electromagnetic particle-in-cell simulation for the initial evolution and a hydrodynamics simulation for the later times. The combination of high temporal resolution and dynamic range in our measurements clearly provides quantitative unraveling of the dynamics in this important region, enabling this as a powerful technique to obtain ultrafast snapshots of plasma density and temperature profiles for providing benchmarks for simulations.

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“…The inhibition factor was originally introduced in laser-plasma interaction to describe the electron transport from the absorption area to the ablation domain in the plasma region [19] . A more comprehensive discussion of this factor is given in the literature, [11,12] .…”

Section: Discussionmentioning

confidence: 99%

“…These high velocities can be achieved by laser acceleration. As is well known [19] , for laser irradiances much larger than 10 16 W/cm 2 the ponderomotive force is the dominant force, and it can accelerate a foil. The acceleration of the micro-foil by a picosecond multi-petawatt laser is calculated analytically in this paper.…”

Section: Introductionmentioning

confidence: 88%

“…The nonlinear heat transport equation and the energy conservation are described accordingly by [19,20] ∂T ∂t = a ∂ ∂x T n ∂T ∂x ; T(x, t)dx = W hw Sρ C C V , (12) where T(x, t) is the temperature in degrees Kelvin at position x and time t. The thermal diffusivity aT n (cm 2 /s) in our case is taken for n = 5/2 with a being a constant. ρ C is the density of the compressed target, and it is assumed constant during the heat wave transition.…”

Section: Criterion For Fast Ignition By Heat Wavementioning

confidence: 99%

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Heat wave fast ignition in inertial confinement energy

Eliezer

Pinhasi²

2013

High Pow Laser Sci Eng

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An accelerated micro-foil is used to ignite a pre-compressed cylindrical shell containing deuterium-tritium fuel. The well-known shock wave ignition criterion and a novel criterion based on heat wave ignition are developed in this work. It is shown that for heat ignition very high impact velocities are required. It is suggested that a multi-petawatt laser can accelerate a micro-foil to relativistic velocities in a very short time duration (˜picosecond) of the laser pulse. The cylindrical geometry suggested here for the fast ignition approach has the advantage of geometrically separating the nanosecond lasers that compress the target from the picosecond laser that accelerates the foil. The present model suggests that nuclear fusion by micro-foil impact ignition could be attained with currently existing technology.

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The Interaction of High-Power Lasers with Plasmas

Cited by 236 publications

References 0 publications

Initial-value-problem solution for isolated rippled shock fronts in arbitrary fluid media

Initial-value-problem solution for isolated rippled shock fronts in arbitrary fluid media

Doppler Spectrometry for Ultrafast Temporal Mapping of Density Dynamics in Laser-Induced Plasmas

Heat wave fast ignition in inertial confinement energy

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