Enhanced Fluctuations in Semi-infinite Plasmas

Zagorodny, A. G.; Tegeback, R.; Usenko, A. S.; Yakimenko, I. P.

doi:10.1088/0031-8949/18/3/007

Cited by 8 publications

(8 citation statements)

References 9 publications

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“…It should be noted that Rytov's approach to describe electromagnetic fluctuations, which we used here, is not unique, but one of the possible ways to calculate spectral and correlation properties based on Maxwell's equations and the fluctuation-dissipation theorem. Other examples in the case of plasma-like half-spaces, including nonequilibrium states and nonlocal effects are described, for example, in [29,30].…”

Section: Discussionmentioning

confidence: 99%

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Spectral composition and spatial distribution of thermal fields near a solid surface

Dorofeyev

Vinogradov

2013

Laser Phys.

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The relative contributions of the evanescent and propagating waves at different distances from the total thermally stimulated electromagnetic fields generated by solids are studied. We analyzed both the spectral power densities of different polarizations and integrated quantities over the whole spectral range. A detailed analysis of the spatial structure of thermal electromagnetic fields near a sample surface is performed and illustrated. It is graphically shown that thermal fields near a surface are mainly represented at the frequencies of the eigenmodes (normal modes) of the system under study. We illustrate the limits of applicability of known simple analytic approximations of the general formulas for thermal fields in the near and far zones. The influence of the details of the density of states of thermal fields on the integral quantity of the energy is explained. Furthermore, the complex spectra of thermal fields of different polarizations generated by the plane-layered structure are graphically analyzed. Such spectra consist of different resonances corresponding to the whole set of the surface polaritons, the Fabry–Perot and waveguided modes of the system under study. We also estimate the total energy of the evanescent thermal fields around the heated sample and show that this energy is much smaller than the thermal energy stored inside the heated solids.

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Section: Discussionmentioning

confidence: 99%

“…Another very interesting fact is that the larger the temperature, the smaller the relative contribution from the evanescent part to the total fields [23]. Using equations (28) and (29) it was demonstrated that…”

Section: Energy Density Of Thermal Electromagnetic Fields Of a Half-s...mentioning

confidence: 99%

Spectral composition and spatial distribution of thermal fields near a solid surface

Dorofeyev

Vinogradov

2013

Laser Phys.

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“…[1][2][3][4] It is natural, that in both cases, particle collisions lead to the growth of the instability thresholds and considerably influence the instability domains.…”

Section: -9mentioning

confidence: 99%

Fluctuations in collisional plasma in the presence of an external electric field

Momot

Zagorodny

2011

Physics of Plasmas

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The theory of large-scale fluctuations in a plasma is used to calculate the correlations functions of electron and ion density with regard to particle collisions described within the Bhatnagar-Gross-Krook (BGK) model and the presence of a constant external electric field. The changes of plasma particle distribution functions due to an external electric field and their influence on the plasma dielectric response are taken into account. The dispersion relations for longitudinal waves in such a plasma are studied in details. It is shown that external electric field can lead to the ion-acoustic wave instability and anomalous growth of the fluctuation level. Detailed numerical studies of the general relations for electron number density fluctuations are performed and the effect of external electric field on the fluctuation spectra is studied.

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“…Note that the imaginary part of w(k) should be neglected due to oddness of integrand (12). Then the spectral intensity of beam energy losses in unit time takes the form…”

Section: Spontaneous and Stimulated Radiation Of An Electron Beam In ...mentioning

confidence: 99%

Theory of some nonlinear processes in plasma in terms of spontaneous and stimulated radiation

Kirichok¹,

Kuklin²

2010

Phys. Scr.

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We apply the well-known concept of spontaneous and stimulated emission to some nonlinear processes in plasma. The consideration of beam–plasma instability in this approach allows us not only to obtain an increment of the instability and other important characteristics by a non-traditional method but also to study in detail the initial stage of the instability, when a noise caused by spontaneous emission has a great influence on further dynamics of the system. Another interesting example of the considered method is the three-wave interaction of ion-sonic waves in plasma. We have shown that oscillations generated by nonlinear currents at combined frequencies demonstrate all the characteristics of spontaneous and stimulated emission. In both cases, we derived the equations for the intensity of emitting waves in a form that is similar to equations obtained in the traditional theory of spontaneous and stimulated emission.

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Enhanced Fluctuations in Semi-infinite Plasmas

Abstract: In Section 1 of the present paper we obtain the kinetic Enhanced fluctuations in semi-infinite plasmas.

Cited by 8 publications

References 9 publications

Spectral composition and spatial distribution of thermal fields near a solid surface

Spectral composition and spatial distribution of thermal fields near a solid surface

Fluctuations in collisional plasma in the presence of an external electric field

Theory of some nonlinear processes in plasma in terms of spontaneous and stimulated radiation

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