Numerical studies of the anomalous skin effect

Jp, Matte; Aguenaou, K

doi:10.1103/physreva.45.2558

Cited by 24 publications

(13 citation statements)

References 22 publications

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“…For equivalent parameters, our results are in agreement with others. 13 But for deeper positions inside a target, which have not been studied by others, we find that the field amplitude is considerably enhanced due to the anomalous skin effect, even for constant collision frequency. This is different from that in Ref.…”

Section: Introductioncontrasting

confidence: 47%

Field enhancement due to anomalous skin effect inside a target

Tan

1996

Physics of Plasmas

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A new method based on Fourier transformation to study the skin effects is presented. Using this method, the field amplitude in plasma is represented in terms of electric conductivity, and the normal and anomalous skin effects are described through one formula by omitting the plasma dispersion or not. The results are in agreement with other publications ͓e.g., J. P. Matte and K. Aguenaou, Phys. Rev. A 45, 2558 ͑1992͔͒ for equivalent parameters. But for deeper positions inside a target, which have not been studied by others, it is found that the field amplitude is considerably enhanced due to an anomalous skin effect, even for constant collision frequency. In addition, the skin absorptions and some calculations on an anomalous skin effect for different collision frequencies are also presented.

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Section: Introductioncontrasting

confidence: 47%

Field enhancement due to anomalous skin effect inside a target

Tan

1996

Physics of Plasmas

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“…[8] show that the fraction of energy transmitted by a 0.1 mm thick plasma is expected to be within the range of 10 25 to 10 26 , i.e., many orders of magnitude lower than the transmittivity measured in our experiment at 3 3 10 18 W͞cm 2 .…”

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confidence: 78%

“…A deeper penetration (anomalous skin effect) is possible in very hot plasmas, where the electron velocity becomes larger than v 0 d 0 [6]. Recently the anomalous skin effect in solid-density plasmas has been considered both analytically [7] and numerically [8], with attention to the case of interaction with thin foils.From an experimental point of view, a serious problem that can prevent interaction of short pulses with solid-density plasmas may arise from the laser prepulse originating from amplified spontaneous emission (ASE) in the laser chain. If the intensity on target due to the prepulse (typically of nanosecond duration) is higher than the threshold intensity for plasma formation on target, a precursor plasma is formed which prevents the main femtosecond pulse to interact directly with the solid.…”

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confidence: 99%

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Observation of Solid-Density Laminar Plasma Transparency to Intense 30 Femtosecond Laser Pulses

Giulietti¹,

Gizzi²,

Giulietti³

et al. 1997

Phys. Rev. Lett.

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Near total transmission of 30 fs laser pulses through 0.1 mm plastic foil targets has been observed for the first time at an intensity of 3 3 10 18 W͞cm 2 in absence of precursor plasma. This level of transmittivity is far above the level predicted by current theoretical models or numerical simulations. The transmittivity was found to drop by 40 times at an intensity of 4 3 10 17 W͞cm 2 and was within the experimental background level at 5 3 10 16 W͞cm 2 . Our measurements strongly suggest a new mechanism of propagation of electromagnetic waves through overdense plasmas.[S0031-9007 (97)04356-1] PACS numbers: 52.40.NkThe interaction of intense optical radiation with plasmas characterized by solid-density and ultrasteep gradients can now be studied by using short pulse lasers capable of delivering up to joules of energy in few tens of femtoseconds. In principle, such laser systems open the possibility of investigating phenomena produced by high intensity radiation in experimentally unexplored conditions, including propagation in plasmas whose density is orders of magnitudes higher than the critical density n c m e v 2 0 ͞4pe 2 , v 0 being the laser frequency. Recently, penetration of ultraintense, short laser pulses into overdense plasmas has been extensively investigated both theoretically and experimentally also in view of its relevance to the implementation of the fast ignitor concept [1]. Several effects have been considered that predict enhanced propagation, including anomalous skin effect [2], self-induced transparency [3], and hole boring [4,5]. Hole boring and self-induced transparency have been mostly investigated in the interaction of relativistic laser pulses with moderately overdense plasmas. In particular, hole boring has been proposed as a possible mechanism for deep energy deposition in overdense plasma regions due to ponderomotive forces at relativistic intensities. The importance of relativistic effects is given by the value of the normalized relativistic momentum, a 0 p os ͞m o c Х 0.85l 0 p I 0 where p os is the momentum of the electrons oscillating in the laser field, m o is the electron mass, c is the velocity of light, and I 0 and l 0 are the laser intensity in units of 10 18 W͞cm 2 and the wavelength in microns, respectively. For these effects to give a nonmarginal increase of transmittivity through plasma slabs, either the plasma must be weakly overdense or the intensity must be very high (a 0 ¿ 1).At nonrelativistic intensity the propagation of the electromagnetic (e.m.) wave into an overdense plasma is expected to be limited to the skin depth d 0 . A deeper penetration (anomalous skin effect) is possible in very hot plasmas, where the electron velocity becomes larger than v 0 d 0 [6]. Recently the anomalous skin effect in solid-density plasmas has been considered both analytically [7] and numerically [8], with attention to the case of interaction with thin foils.From an experimental point of view, a serious problem that can prevent interaction of short pulses with solid-density plasmas may...

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“…7 To this we have to add that numerical simulations of the conventional anomalous skin effect, which allows enhanced penetration of laser fields in very overdense plasmas due to a nonlocal description of the conductivity, predict transmissions ϳ0.1% for 700 Å thick Al targets at a 5 keV temperature. 8 In this study of laser propagation through hot and initially highly overdense plasmas, the main result we obtain is significant transmission levels ͑a few %͒ at very high intensities, with a sharp threshold behavior as a function of the incident laser intensity. The comparison between measurements and two-dimensional ͑2D͒ PIC simulations suggests the occurrence of a mechanism of overdense propagation involving an initial very high heating of the foils, followed by a rapid expansion ͑target decompression͒ that lowers the density fast enough so that the beam can propagate by RSIT in a plasma which is at a few times the critical density.…”

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confidence: 71%

Experimental study of laser penetration in overdense plasmas at relativistic intensities. II: Explosion of thin foils by laser driven fast electrons

et al. 1999

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Propagation of a high-contrast frequency-doubled subpicosecond ͑300 fs͒ relativistic (I 2 up to 5ϫ10 18 W•cm Ϫ2•m 2 ) laser pulse through thin and initially solid foils is studied. Transmission values up to 10% are measured through targets with initial near solid densities. The strong intensity threshold observed for the transmitted energy is correlated with clear modifications of the transmitted and reflected spectra, electron generation, and beam imaging. Two-dimensional Cartesian particle-in-cell ͑PIC͒ simulations that qualitatively reproduce the experimental results suggest specific rapid heating of the thin targets by fast electrons, plasma expansion, and density decrease to relativistically transmissive conditions during the pulse.

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Numerical studies of the anomalous skin effect

Cited by 24 publications

References 22 publications

Field enhancement due to anomalous skin effect inside a target

Field enhancement due to anomalous skin effect inside a target

Observation of Solid-Density Laminar Plasma Transparency to Intense 30 Femtosecond Laser Pulses

Experimental study of laser penetration in overdense plasmas at relativistic intensities. II: Explosion of thin foils by laser driven fast electrons

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