Relativistic electron drift in underdense plasma produced by a super-intense femtosecond laser pulse

Sofronov, A. V.; Крайнов, В. П.

doi:10.1088/0953-4075/37/17/l04

Cited by 15 publications

(3 citation statements)

References 16 publications

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“…9 , linear and nonlinear Landau damping 30,31 . Candidates of the second class are, first of all, sharp edge absorption 4 , longitudinal 32 and transverse 33 ponderomotive heating, "zero vector potential mechanism" 18 , relativistic kinematic model 23 , anharmonic resonance 34 . Let our PIC simulations decide on questions (i) -(iii) and to what degree statistics is involved in the dynamics induced by the laser in dense targets.…”

Section: Collisionless Absorption Basically Understoodmentioning

confidence: 99%

Collisionless absorption, hot electron generation, and energy scaling in intense laser-target interaction

2015

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Among the various attempts to understand collisionless absorption of intense and superintense ultrashort laser pulses a whole variety of models and hypotheses has been invented to describe the laser beam target interaction. In terms of basic physics collisionless absorption is understood now as the interplay of the oscillating laser field with the space charge field produced by it in the plasma. A first approach to this idea is realized in Brunel's model the essence of which consists in the formation of an oscillating charge cloud in the vacuum in front of the target, therefore frequently addressed by the vague term "vacuum heating". The investigation of statistical ensembles of orbits shows that the absorption process is localized at the ion-vacuum interface and in the skin layer: Single electrons enter into resonance with the laser field thereby undergoing a phase shift which causes orbit crossing and braking of Brunel's laminar flow. This anharmonic resonance acts like an attractor for the electrons and leads to the formation of a Maxwellian tail in the electron energy spectrum. Most remarkable results of our investigations are the Brunel like spectral hot electron distribution at the relativistic threshold, the minimum of absorption at Iλ 2 ∼ = (0.3 − 1.2) × 10 21 Wcm −2 µm 2 in the plasma target with the electron density of n e λ 2 ∼ 10 23 cm −3 µm 2 , the drastic reduction of the number of hot electrons in this domain and their reappearance in the highly relativistic domain, and strong coupling, beyond expectation, of the fast electron jets with the return current through Cherenkov emission of plasmons.The hot electron energy scaling shows a strong dependence on intensity in the moderately relativistic domain Iλ 2 ∼ = (10 18 − 10 20 ) Wcm −2 µm 2 , a scaling in vague accordance with current published estimates in the range Iλ 2 ∼ = (0.14 − 3.5) × 10 21 Wcm −2 µm 2 , and again a distinct power increase beyond I = 3.5 × 10 21 Wcm −2 µm 2 . The low energy electrons penetrate normally to the target surface, the energetic electrons propagate in laser beam direction.

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Section: Collisionless Absorption Basically Understoodmentioning

confidence: 99%

Collisionless absorption, hot electron generation, and energy scaling in intense laser-target interaction

2015

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“…The longitudinal (along the direction of laser-pulse propagation) relativistic drift velocity of an electron after the end of the laser pulse is governed by the nonadiabatic instant of relativisticelectron formation in the course of ionization of an atom or an atomic ion. The maximum value of this velocity is [14] v || = a 2 4 + a 2 c. Thus, the maximum longitudinal velocity of the electrons is 0.284c, and their maximum longitudinal kinetic energy is E || = 21 keV. Unlike transverse motion, the longitudinal motion of an electron is nonrelativistic.…”

Section: Theoretical Estimationsmentioning

confidence: 99%

10.1007/s11450-008-3006-3

2010

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The results of experiments devoted to studying the generation of MeV photons and protons in picosecond laser plasmas at a laser beam intensity of 10 18 W/cm 2 on Be, Ta, LiF and H 7 Li targets are presented. Nuclear reactions (γ, n) and (p, n) were used to detect MeV photons and protons. The number of MeV photons and protons generated in laser plasmas was found from the measured neutron yield. Possibilities of particle acceleration due to the formation of pinch structures in laser plasmas are discussed. Calculated and experimental results are compared.

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“…29 Furthermore, in previous works, the relativistic electron drift in the underdense and overdense plasmas produced by a superintense femtosecond laser plasma was investigated. 30,31 In this work, we consider the interaction of a highfrequency electromagnetic wave with an underdense plasma. This case models the interaction of a laser with a solid target.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear structure of the electromagnetic waves in underdense plasmas

Shokri

Niknam

2006

Physics of Plasmas

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The interaction of a high-frequency electromagnetic wave with a collisionless unmagnetized nonisothermal plasma, taking into account the ponderomotive force per unit volume acting on the plasma electrons, is studied. The electron density distribution is found. Obtaining the nonlinear differential and integral equations for the electric field and using the Maxwell equations, we investigate the electric and magnetic field profiles in plasma. It is shown that the profiles of the electric and magnetic field departure from a sinusoidal shape and the electron density becomes highly peaked for the higher electromagnetic energy flux.

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Relativistic electron drift in underdense plasma produced by a super-intense femtosecond laser pulse

Cited by 15 publications

References 16 publications

Collisionless absorption, hot electron generation, and energy scaling in intense laser-target interaction

Collisionless absorption, hot electron generation, and energy scaling in intense laser-target interaction

10.1007/s11450-008-3006-3

Nonlinear structure of the electromagnetic waves in underdense plasmas

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