Generation of a wakefield during gas ionization

Andreev, N. E.; Veisman, M. E.; Cadjan, M. G.; Chegotov, M. V.

doi:10.1134/1.1323559

Cited by 24 publications

(9 citation statements)

References 22 publications

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“…[24][25][26] ͑For pure, highly overdense step profiles, the Brunel effect is suppressed, because the electrons are prevented from entering the vacuum by the induced dc fields near the surface. 27,19 The full analytic calculation in this case is somewhat involved, even using a step-profile approximation, 23 keV͒ with an exponential profile L/ϭ0.023 ͑squares͒. Also shown is the theoretical prediction for the step profile in the anomalous skin effect regime ͑solid line͒-Ref.…”

Section: Comparison Between Theory Pic and Vlasov Simulationmentioning

confidence: 98%

Calibration of one-dimensional boosted kinetic codes for modeling high-intensity laser–solid interactions

et al. 1999

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An efficient means of performing kinetic simulations of oblique-incidence laser–plasma interaction via a relativistic Lorentz transformation is described in detail. Comparisons are made between one-dimensional boost codes and previous two-dimensional particle-in-cell (PIC) simulations in an effort to define benchmarks for modeling high-intensity, short-pulse interactions. Apparent discrepancies between results obtained using PIC and Vlasov codes are resolved, and some pitfalls involved with both techniques are identified.

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Section: Comparison Between Theory Pic and Vlasov Simulationmentioning

confidence: 98%

Calibration of one-dimensional boosted kinetic codes for modeling high-intensity laser–solid interactions

et al. 1999

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“…which is accompanied by (2) (cf [22][23][24]). First we discuss the consequence of the model with equation (1).…”

Section: Laser Pulse Energy Losses and Residual Electron Energymentioning

confidence: 99%

“…Namely, the laser pulse transfers its energy to electrons (1) to overcome the ionization potential barrier and (2) to REE. The latter is described by relation (5) but the former requires introduction of an additional ionization current into Maxwell equations [20,23,24]:…”

Section: Laser Pulse Energy Losses and Residual Electron Energymentioning

confidence: 99%

“…In addition, the modulation becomes more widescale. Such a tendency in the development of ionization modulation means shaping of a stepped pulse profile with jumps in the vicinities of points ξ nl k determined by relation (24). The exponential behaviour of the relative amplitudes on s, (26), leads to suppression of ε (n) k (s) with n > 2 when ε (2) k (s) reaches the maximum.…”

Section: The Elementary Modelmentioning

confidence: 99%

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Ionization modulation of a short intensive laser pulse

Chegotov¹

2002

J. Phys. D: Appl. Phys.

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A deformation of a short intensive laser pulse temporal profile by optical field ionization (OFI) processes is under consideration. In one-dimensional analysis at a comparatively long distance of the pulse propagation the deformation is ensured by optical field absorption in addition to the dispersion. Three-dimensional effects lead to a modulation of the temporal profile at a laser pulse penetration depth less than the Rayleigh length. The modulation originates from interaction between the pulse and the inhomogeneous dynamic plasma channel created by OFI during the laser pulse propagation. A criterion of the laser pulse `smooth' penetration into a gas undergoing ionization at a distance about Rayleigh length is offered.

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“…This is the reason different works have indicated that field ionization can alter the evolution of the laser pulse and affect the energy of electrons. [19][20][21][22][23][24] It is noteworthy that the mechanisms leading to parametric instabilities including the ionization-induced ponderomotive force and the ionization-induced steepening, which are seeded by fluctuations in the laser envelope and in the density, could strongly alter the evolution of the laser pulse and affect the energy of the electrons. [20][21][22] Moreover, some works have been carried out on energy spread for the ionization injection process in gas medium.…”

Section: Introductionmentioning

confidence: 99%

Electron energy spectrum in the field‐ionized plasma

Khalilzadeh

Chakhmachi

Dehghani

et al. 2021

Contributions to Plasma Physics

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In this article, the effect of ionization on the energy spectrum of electrons within the interaction of a laser pulse with hydrogen atoms is investigated using particle-in-cell simulation codes. The results show that the behaviour of electrons' energy distribution function in the field-ionized plasma, which occurred due to the field ionization, compared with that in the pre-plasma strongly depends on the pulse shape. For short rise-time pulses (here 30 fs), due to the rapid enhancement of laser electric field, ionization occurs quickly, and as a result, there is not much difference in the electron energy in both the media.However, for pulses with rise time of 40 fs, in the pre-plasma state, the electron population reaches higher energies compared with the field-ionized plasma state. The main reason for this difference is the nonlinear wave breaking that happens earlier due to density inhomogeneity in the field-ionized plasma. On the other hand, at longer rise-time pulses (here 60 and 70 fs), electrons achieve higher energies in the field-ionized plasma than those in the case of pre-plasma.In this case, because of density fluctuations in the field-ionized plasma, the Raman backscattered radiations are seeded by a strong initial noise at the earlier times and the Mendonca condition for chaos threshold is met sooner. Therefore, the electrons gain more energy through the stochastic mechanism that is in agreement with chaotic nature of the motion.

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Generation of a wakefield during gas ionization

Cited by 24 publications

References 22 publications

Calibration of one-dimensional boosted kinetic codes for modeling high-intensity laser–solid interactions

Calibration of one-dimensional boosted kinetic codes for modeling high-intensity laser–solid interactions

Ionization modulation of a short intensive laser pulse

Electron energy spectrum in the field‐ionized plasma

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