Effects of Collisions on Density Fluctuations in Plasmas

Uddholm, P; Stenflo, L.

doi:10.1088/0031-8949/22/1/010

Cited by 12 publications

(12 citation statements)

References 31 publications

(9 reference statements)

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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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“…[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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“…For a homogeneous plasma, (6) reduces to the corresponding kinetic result, e.g. equation 7of Uddholm & Stenflo (1980), after taking the spatial Fourier transforms. The fluctuation spectrum of a real plasma with interacting particles cannot be treated in this simple fashion, because in such a case the initial particle correlations (i.e.…”

Section: U(rr» = -^^(^^Linirr'm/^r)) (5a)mentioning

confidence: 99%

“…The theory of linear fluctuations in homogeneous and stationary plasmas has now been studied for many years (e.g. Rosenbluth & Rostoker 1962;Hagfors & Brockelman 1971;Uddholm 1982). The theory of fluctuations in semi-infinite plasmas, with sharp boundaries, is also well known (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…For this reason the problem merits another examination. This paper formulates a fluid theory which is analogous to the kinetic transition probability function theory (Hagfors & Brockelman 1971;Uddholm 1982). A relation, which assumes the same form as the fluctuation dissipation theorem in the homogeneous case, is derived below for homogeneous temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Fluid theory for fluctuations in cold inhomogeneous plasmas

Uddholm

1984

J. Plasma Phys.

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The theory for potential surface wave fluctuation spectra in cold, inhomogeneous, magnetized plasmas is reconsidered, adopting a transition probability approach. A fluctuation dissipation relation is derived, which is valid for general density profiles and which reduces to the familiar fluctuation dissipation theorem for homogeneous plasmas. Significant corrections to previous work are found. Particular spectra are calculated for the special case of a magnetized plasma with a one-dimensional inhomogeneity.

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“…The theory for fluctuations in a plasma with a HF pump was developed in [4][5][6][7]. On the basis of this theory the relaxation processes in plasmas were studied in [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Influence of an upper-hybrid pump on temperature relaxation processes in a magnetized plasma

Павленко

Panchenko

2008

J. Plasma Phys.

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By means of kinetic fluctuation theory, the relaxation process between the electron and ion temperatures in a magnetized homogeneous plasma is considered. The cases when the external upper-hybrid pump wave excites modified convective cells and ion-acoustic waves are analysed. The inverse relaxation time in the regime where the turbulent fluctuations are developed is calculated for these cases and its dependence on the pump wave and plasma parameters is deduced.

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Effects of Collisions on Density Fluctuations in Plasmas

Abstract: We have extended the theory for density fluctuations in collisional plasmas by including effects due to the presence of an electromagnetic pump wave, and derived some new and comparatively simple results.

Cited by 12 publications

References 31 publications

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

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

Fluid theory for fluctuations in cold inhomogeneous plasmas

Influence of an upper-hybrid pump on temperature relaxation processes in a magnetized plasma

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