Interaction of annular-focused laser beams with solid targets

Andreev, N. E.; Povarnitsyn, M. E.; Veysman, M E; Faenov, A. Ya.; Levashov, P. R.; Khishchenko, K. V.; Pikuz, T. A.; Magunov, A. I.; Rosmej, O.; Blažević, A.; Pełka, A.; Schaumann, G.; Schollmeier, M.; Roth, Markus

doi:10.1017/s0263034615000580

Cited by 37 publications

(9 citation statements)

References 22 publications

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“…To describe plasma corona formation under the action of different intensity prepulses, the 1D version (Povarnitsyn et al, 2013) of the HELIO2D code (Andreev et al, 2015) was used, which takes into account 1D hydrodynamic motion of matter, laser energy absorption, two-temperature nonequilibrium states for electron and ion subsystems, electron thermal conductivity, and radiation transport in diffusion approximation. The evolution of material parameters is described using the conservation of mass, momentum, and energy of electron and ion subsystems in a single-fluid twotemperature Lagrangian form.…”

Section: Preplasma Formation Under the Action Of Different Prepulse Cmentioning

confidence: 99%

Electron acceleration at grazing incidence of a subpicosecond intense laser pulse onto a plane solid target

et al. 2015

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Generation of hot electrons at grazing incidence of a subpicosecond relativistic-intense laser pulse onto a plane solid target is analyzed for the parameters of petawatt class laser systems. We study preplasma formation on the surface of solid aluminum targets produced by laser prepulses with a different time structure. For modeling of the preplasma dynamics, we use a wide-range two-temperature hydrodynamic model. As a result of simulations, the preplasma expansion under the action of the laser prepulse and the plasma density profiles for different contrast ratios of the nanosecond pedestal are found. These density profiles are used as the initial density distributions in three-dimensional particle-in-cell simulations of electron acceleration by the main P-polarized laser pulse. Results of modeling demonstrate a substantial increase of the characteristic energy and number of accelerated electrons for the grazing incidence of a subpicosecond intense laser pulse in comparison with the ponderomotive scaling of laser-target interaction.

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Section: Preplasma Formation Under the Action Of Different Prepulse Cmentioning

confidence: 99%

Electron acceleration at grazing incidence of a subpicosecond intense laser pulse onto a plane solid target

et al. 2015

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“…Thermodynamic properties of matter at high pressure are of importance in many problems of high energy density physics, in particular, in astrophysics [1], in wide-range equations of state [2,3], in the problems of interaction of intense energy fluxes with matter [4][5][6], in perspective power generation facilities [7] and in some others. The finite-temperature Thomas-Fermi (TF) model [8] based upon semiclassical approximation is widely used to describe thermodynamic properties of matter, but there are many phenomena beyond this approach.…”

Section: Introductionmentioning

confidence: 99%

Influence of shell effects on thermodynamic properties of matter at high pressures

Levashov

Minakov

2018

J. Phys.: Conf. Ser.

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Abstract. We analyze the influence of shell effects on thermodynamic properties of matter at high pressures. Spherically symmetric average atom models show significant contribution of electronic transitions to cold pressure which is not confirmed by more accurate density functional theory models. In particular, the s-d transition in aluminum and potassium does not reveal itself on the shock Hugoniots. Oscillations on shock Hugoniots at very high pressures predicted earlier by many authors should be confirmed by precise first-principle calculations. IntroductionThermodynamic properties of matter at high pressure are of importance in many problems of high energy density physics, in particular, in astrophysics [1], in wide-range equations of state [2,3], in the problems of interaction of intense energy fluxes with matter [4-6], in perspective power generation facilities [7] and in some others. The finite-temperature Thomas-Fermi (TF) model [8] based upon semiclassical approximation is widely used to describe thermodynamic properties of matter, but there are many phenomena beyond this approach. In particular, shell effects reflect non-regularities of physical parameters because of the discrete energy spectrum. For example, in low-density plasma step-wise dependencies of thermodynamic functions on isochors or isobars are quite typical [9]. The other well-known effect is connected with the non-regular behavior of density of elements vs. atomic mass [10,11]. To describe shell effects one should take into account discrete energy levels. Analytically shell corrections to the TF model have been studied in [12,13] using the Poisson formula in the transition from summation to integration (see also the review [14]). Average atom models [15][16][17][18][19] are based on a radial solution of the single-particle Schrödinger (Dirac) equation so that the discrete spectrum and shell effects are taken into account implicitly. During the last 30 years it became possible to obtain approximate three-dimensional (3D) solutions of a quantum many-particle problem using density functional theory (DFT) [20,21]. In this case one gets a 3D band structure of a system of particles that provides for the appearance of shell effects through non-regularities of the electronic density and some thermodynamic functions. There were several attempts to register shell effects at high pressures and temperatures experimentally [22][23][24] using underground nuclear explosions. It is claimed [24] that the influence of the discrete energy spectrum is

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“…Knowing wide-range expressions for ε(k, ω) and also transport coefficients and equations of state, one can determine space and time dependencies of laser heated matter by means of hydrodynamic codes such as Lasnex [5], Medusa [6], Multi-fs [7], or the code of the JIHT group [8][9][10][11]. Primarily, those codes use semi-empirical models for ε(k, ω) and a corresponding effective electron-ion (electron-phonon) collision frequency [8,12], which are derived from kinetic equations and give known limits for the case of weakly-coupled plasmas, hand-book values for cold solid, and are based on physically reasonable estimates and experimental data in the intermediate region [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Optical conductivity of warm dense matter within a wide frequency range using quantum statistical and kinetic approaches

et al. 2016

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Fundamental properties of warm dense matter are described by the dielectric function, which gives access to the frequency-dependent electrical conductivity, absorption, emission and scattering of radiation, charged particles stopping and further macroscopic properties. Different approaches to the dielectric function and the related dynamical collision frequency are compared in a wide frequency range. The high-frequency limit describing inverse bremsstrahlung and the low-frequency limit of the dc conductivity are considered. Sum rules and Kramers-Kronig relation are checked for the generalized linear response theory and the standard approach following kinetic theory. The results are discussed in application to aluminum, xenon and argon plasmas.

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Interaction of annular-focused laser beams with solid targets

Cited by 37 publications

References 22 publications

Electron acceleration at grazing incidence of a subpicosecond intense laser pulse onto a plane solid target

Electron acceleration at grazing incidence of a subpicosecond intense laser pulse onto a plane solid target

Influence of shell effects on thermodynamic properties of matter at high pressures

Optical conductivity of warm dense matter within a wide frequency range using quantum statistical and kinetic approaches

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