Difference between relativistic petawatt-picosecond laser-plasma interaction and subrelativistic plasma-block generation

Hora, Heinrich

doi:10.1017/s0263034605050627

Cited by 29 publications

(7 citation statements)

References 69 publications

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“…The fact that highly ionized plasmas without any molecules with surface tension was derived from the electric fields within the Debye length at a plasma surface due to the gradient of the electrostatic energy density~Hora et al., 1984;Hora, 1991a!. The physics of Debye length for laser produced plasmas received a special development for the conditions of relativistic interaction for the proton beam generatioñ Hora, 2005b;Schaumann et al, 2005!, in …”

Section: Surface Energy and Quark-gluon Plasmamentioning

confidence: 99%

Debye sheath mechanism at laser plasma interaction and generalization to nuclear forces and quark-gluon plasma

2005

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The studies of laser ablation have lead to a new theory of nuclei, endothermic nuclei generation, and quark-gluon plasmas. The surface of ablated plasma expanding into vacuum after high power laser irradiation of targets contains an electric double layer having the thickness of the Debye length. This led to the discovery of surface tension in plasmas, and led to the internal dynamic electric fields in all inhomogeneous plasmas. The surface tension causes stabilization by short length surface wave smoothing the expanding plasma plume and to stabilization against the Rayleigh-Taylor instability. Generalizing this to the degenerate electrons in a metal with the Fermi energy instead of the temperature resulted in the first quantum theory of surface tension of metals in agreement with measurements. Taking the Fermi energy in the Debye length for nucleons results in a theory of nuclei with stable confinement of protons and neutrons just at the well-known nuclear density, and the Debye lengths equal to the Hofstadter decay of the nuclear surface. Increasing the nuclear density by a factor of 10 leads to a change of the Fermi energy into its relativistic branch where no surface energy is possible and the particle mass is not defined, permitting the quark gluon plasma. Expansion of this higher density at the big bang or in super-nova results in nucleation and element generation. The Boltzmann equilibrium permits the synthesis of nuclei even in the endothermic range, however with the limit to about uranium. A relation for the magic numbers leads to a quark structure of nuclear shells that can be understood as a duality property of nuclei with respect to nucleons and quarks

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Section: Surface Energy and Quark-gluon Plasmamentioning

confidence: 99%

Debye sheath mechanism at laser plasma interaction and generalization to nuclear forces and quark-gluon plasma

2005

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“…Further, the introduction of ultra high power laser [16] has led to many theoretical and experimental studies in the inertial confinement fusion (ICF) [17][18][19][20], charged particle acceleration [21][22][23] and ionospheric modification [24][25][26][27]. In many of such studies the ponderomotive as well as the relativistic nonlinearities have to be considered.…”

Section: Introductionmentioning

confidence: 99%

Focusing of Dark Hollow Gaussian Electromagnetic Beams in a Plasma With Relativistic-Ponderomotive Regime

MIshra¹,

Mishra²

2009

PIER B

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Abstract-This paper presents a theoretical model for the propagation of a hollow Gaussian electromagnetic beam [HGB], propagating in a plasma with dominant relativistic-ponderomotive nonlinearity. A paraxial like approach has been invoked to understand the nature of propagation; in this approach all the relevant parameters correspond to a narrow range around the irradiance maximum of the HGB. The critical curves for the propagation of various order HGBs have been discussed, and the dependence of the beam width parameter on distance of propagation has been evaluated for three typical cases viz. of steady divergence, oscillatory divergence and self focusing of the HGB.

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“…(4) and (27) with separate variation of parameters representing the collisional frequency, initial irradiation intensity and electron temperature, initial laser beam-width, where parameters a ¼ 0.2404, b ¼ 1, c ¼ 0.2, and q 2 0 ¼ 100 in Fig. 7 are chosen as a contrast.…”

Section: Results and Disscussionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9] For efficient interactions with plasmas, laser beams should be required to preserve strong intensity and propagate several Rayleigh lengths; hence, the main thrust of experimental and theoretical studies on propagation characteristics of laser beams has been directed toward the self-focusing and irradiation attenuation. In experiments, it has been confirmed that intense short laser pulses could propagate quite long distances with nonlinear self-focusing offsetting the diffraction divergence, [10][11][12] which evokes the upsurge in theoretical studies of nonlinear mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Propagation of Gaussian laser beam in cold plasma of Drude model

et al. 2011

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The propagation characters of Gaussian laser beam in plasmas of Drude model have been investigated by complex eikonal function assumption. The dielectric constant of Drude model is representative and applicable in describing the cold unmagnetized plasmas. The dynamics of ponderomotive nonlinearity, spatial diffraction, and collision attenuation is considered. The derived coupling equations determine the variations of laser beam and irradiation attenuation. The modified laser beam-width parameter F, the dimensionless axis irradiation intensity I, and the spatial electron density distribution n/n0 have been studied in connection with collision frequency, initial laser intensity and beam-width, and electron temperature of plasma. The variations of laser beam and plasma density due to different selections of parameters are reasonably explained, and results indicate the feasible modification of the propagating characters of laser beam in plasmas, which possesses significance to fast ignition, extended propagation, and other applications.

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Difference between relativistic petawatt-picosecond laser-plasma interaction and subrelativistic plasma-block generation

Cited by 29 publications

References 69 publications

Debye sheath mechanism at laser plasma interaction and generalization to nuclear forces and quark-gluon plasma

Debye sheath mechanism at laser plasma interaction and generalization to nuclear forces and quark-gluon plasma

Focusing of Dark Hollow Gaussian Electromagnetic Beams in a Plasma With Relativistic-Ponderomotive Regime

Propagation of Gaussian laser beam in cold plasma of Drude model

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