Penetration of an electromagnetic field into a magnetoactive plasma

Kondratenko, A. N.

doi:10.1007/bf01029622

Cited by 5 publications

(11 citation statements)

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“…It thus neither radiates nor absorbs electromagnetic waves [19,20]. Conversely, a p-polarized electromagnetic beam, impinging onto a stratified plasma, may be partly converted into an electrostatic Langmuir wave [21,22]. Conversion takes place near the critical surface, where the beam frequency matches the local electron Langmuir frequency, zeroing out the dielectric permittivity.…”

Section: Introductionmentioning

confidence: 99%

“…The plasma wave, permitted by the dispersion law, is then resonantly driven by the component of rotational electric field parallel to the density gradient. The process may go in reverse: the Langmuir wave excited in the stratified plasma may be converted into electromagnetic waves, generating at every point of the density down-ramp the wave with a frequency equal to the local Langmuir frequency [22][23][24][25][26]. For this kind of wave transformation to occur, electron velocity in the Langmuir wave must have a component orthogonal to the density gradient [4,17].…”

Section: Introductionmentioning

confidence: 99%

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Single-cycle THz signal accompanying laser wake in photoionized plasmas

Kalmykov

Englesbe

Elle

et al. 2020

Plasma Phys. Control. Fusion

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Photoionization of an ambient gas by a weakly relativistic, femtosecond laser pulse leaves behind the pulse a flat-top plasma column. The uniform-density core of the column is surrounded by a micron-thin shell, within which the density of plasma species falls down to zero. As the laser pulse ponderomotive force drives the wave of charge separation (the laser wake), electron fluid velocity oscillates along this boundary layer. Coupling velocity oscillations to the transverse density gradient forms an azimuthally polarized rotational current confined within the boundary layer. At each radial offset, this current oscillates with a local (THz-scale) Langmuir frequency, transforming the cylindrical electrostatic plasma wave into a radially evanescent Fourier component of an electromagnetic signal. Summing up these Fourier components yields the time-domain THz signal which is (a) non-local (i.e. not phase-locked to the Langmuir oscillation at any given location), (b) contains the entire frequency band from zero to the Langmuir frequency of the density plateau, and (c) is detectable at a distance orders of magnitude larger than the plasma column radius. A few millimeters away from the column, rapid evanescence of the higher-frequency components transforms the signal into a radially polarized, single-cycle picosecond pulse with a kV m −1 -scale electric field. Detecting this pulse with existing (e.g. electro-optical) techniques may bring information on the efficiency of laser coupling to the plasma, the amplitude of wake fields, and the structure of the column boundary.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Single-cycle THz signal accompanying laser wake in photoionized plasmas

Kalmykov

Englesbe

Elle

et al. 2020

Plasma Phys. Control. Fusion

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“…In the previous sections we have considered the method, leading to exact solution of the skin effect problem with arbitrary specularity coefficient. In the case q = 1 the method leads to the classical solution (4.6) of the problem with specular surface conditions (see, for example [5], [10], [17]). In [10] this classical solution is represented in the form:…”

Section: Analysis and Discussionmentioning

confidence: 99%

“…In the case q = 1 the method leads to the classical solution (4.6) of the problem with specular surface conditions (see, for example [5], [10], [17]). In [10] this classical solution is represented in the form:…”

Section: Analysis and Discussionmentioning

confidence: 99%

Skin effect with arbitrary specularity in Maxwellian plasma

Латышев

Yushkanov

2010

Journal of Mathematical Physics

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The problem of skin effect with arbitrary specularity in maxwellian plasma with specular-diffuse boundary conditions is solved. New analytical method is developed that makes it possible to obtain a solution up to an arbitrary degree of accuracy. The method is based on the idea of symmetric continuation of not only the electric field, but also electron distribution function. The solution is obtained in a form of von Neumann series.

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“…This is the so-called non-local or the anomalous skin effect regime [4]. A good review of earlier work is given in [5]; see also [6,7] for various extensions of the theory, and [8,9] for recent theortical advancements, and [2,3] for relevant experimental evidence. One can obtain the expression for the skin-depth in the anomalous skin effect regime by using the Landau resonance condition as an estimate for the effective collisional frequency, which is then used to replace ν e in the local skin-depth expression…”

Section: Introductionmentioning

confidence: 99%

Non-local ponderomotive force in finite temperature inductive plasmas

Smolyakov¹,

Sydorenko²,

Froese³

2007

Plasma Phys. Control. Fusion

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Inductively coupled plasma discharges demonstrate a number of kinetic and nonlinear phenomena of general interest such as collisionless electromagnetic wave absorption (Landau heating), ponderomotive effects and nonlinear regimes of the anomalous skin effect. In a finite temperature plasma the electron response becomes strongly non-local due to the thermal motion. This results in a significant reduction of the ponderomotive force amplitude. At larger amplitudes, nonlinear modification of the electron trajectories due to the Lorentz force partially restores the amplitude of the ponderomotive force, even to the extent of approaching the local value.

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Penetration of an electromagnetic field into a magnetoactive plasma

Cited by 5 publications

References 0 publications

Single-cycle THz signal accompanying laser wake in photoionized plasmas

Single-cycle THz signal accompanying laser wake in photoionized plasmas

Skin effect with arbitrary specularity in Maxwellian plasma

Non-local ponderomotive force in finite temperature inductive plasmas

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