Collective mode properties in a paired fullerene-ion plasma

Oohara, W.; Kuwabara, Y.; Hatakeyama, Rikizo

doi:10.1103/physreve.75.056403

Cited by 106 publications

(83 citation statements)

References 62 publications

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“…2-4, the modes are initiated by a cylindric exciter at one end of the chamber, and they also appear to propagate almost parallel to the magnetic field vector, i.e., they may include a ͑small͒ wave number component in the perpendicular direction as well, as commented in Ref. 4.…”

Section: Modelmentioning

confidence: 92%

“…In the experiments [1][2][3][4][5] due to the specific filtering mentioned above, only pair ions are collected in the chamber, and it is believed that electrons are generally absent. The arguments supporting this opinion are convincing and, hence, we accept the mentioned filtering as a fact.…”

Section: Modelmentioning

confidence: 99%

“…Yet, the IAW also seems to be problematic because it should not appear in the perfectly antisymmetric pair-ion plasma in question here ͑i.e., with two ion groups with equal masses and temperatures, but opposite charges͒. However, specific conditions in the experiments [1][2][3][4][5] related to the different processes ͑electron impact emission and attachment͒ involved in the production of the positive and negative ions, reveal a small disparity in the two temperatures, and this should in principle allow for an electrostatic acoustic mode to develop.…”

Section: Introductionmentioning

confidence: 99%

“…In the recent past, there has been a lot of activity on the theory and the experiments dealing with such plasmas, initiated by a series of works describing the experimental production of pair ions. [1][2][3][4][5] The ions in question are in fact, C 60 Ϯ produced in simultaneous processes of impact ionization and electron attachment, that are further collected by a magnetic filtering effect, i.e., by a diffusion in the radial direction ͑perpendicular to the magnetic field lines͒. In this way the ions are first separated from the electrons, and then collected through an annular hole ͑with 3 cm diameter͒, due to a subsequent downstream along the magnetic lines, in a very narrow and elongated chamber ͑90 cm in length, and with an 8 cm diameter͒.…”

Section: Introductionmentioning

confidence: 99%

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Electrostatic modes in multi-ion and pair-ion collisional plasmas

et al. 2008

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The physics of plasmas containing positive and negative ions is discussed with special attention to the recently produced pair-ion plasma containing ions of equal mass and opposite charge. The effects of the density gradient in the direction perpendicular to the ambient magnetic field vector are discussed. The possible presence of electrons is discussed in the context of plasma modes propagating at an angle with respect to the magnetic field vector. It is shown that the electron plasma mode may become a backward mode in the presence of a density gradient, and this behavior may be controlled either by the electron number density or the mode number in the perpendicular direction. In plasmas with hot electrons an instability may develop, driven by the combination of electron collisions and the density gradient, and in the regime of a sound ions' response. In the case of a pure pair-ion plasma, for lower frequencies and for parameters close to those used in the recent experiments, the perturbed ions may feel the effects of the magnetic field. In this case the plasma mode also becomes backward, resembling features of an experimentally observed but yet unexplained backward mode.

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Section: Modelmentioning

confidence: 92%

Section: Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrostatic modes in multi-ion and pair-ion collisional plasmas

et al. 2008

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“…1 Efforts have also been made to produce PI plasma of hydrogen ions (H þ and H À ). 2 A series of experiments has been performed to produce pair-ion plasmas [1][2][3][4][5] and this activity has generated a lot of interest from theoreticians in this area. As a matter of fact, a few theoreticians 6 have tried to explain the observations of Ref.…”

Section: Introductionmentioning

confidence: 99%

Shear flow-driven electrostatic instabilities in low density and low temperature pair-ion plasmas with and without electrons

2011

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The shear flow-driven electrostatic instabilities are investigated in ideal low density, low temperature pair-ion-electron and pure pair-ion plasmas in several different cases, including homogeneous and inhomogeneous density effects. In uniform pair-ion-electron plasma, when the shear flow is of the order of the acoustic speed, the purely growing D'Angelo mode can give rise to electrostatic fields. In the case of an inhomogeneous plasma, the drift wave becomes unstable. The presence of negative ions, however, reduces the growth rate. If the positive and negative ions are not in thermal equilibrium with each other, then the shear flow also gives rise to an electrostatic instability in pure pair-ion plasma.

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Dust‐ion‐acoustic solitary waves in a magnetized dusty pair‐ion plasma with Cairns‐Gurevich electrons and opposite polarity dust particles

Abdikian

2018

Contributions to Plasma Physics

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The nonlinear dust-ion-acoustic (DIA) solitary structures have been studied in a dusty plasma, including the Cairns-Gurevich distribution for electrons, both negative and positive ions, and immobile opposite polarity dust grains. The external magnetic field directed along the z-axis is considered. By using the standard reductive perturbation technique and the hydrodynamics model for the ion fluid, the modified Zakharov-Kuznetsov equation was derived for small but finite amplitude waves and was provided the solitary wave solution for the parameters relevant. Using the appropriate independent variable, we could find the modified Korteweg-de Vries equation. By plotting some figures, we have discussed and emphasized how the different plasma values, such as the trapping parameter, the positive (or negative) dust number density, the non-thermal electron parameter, and the ion cyclotron frequency, can influence the solitary wave structures. In addition, using the bifurcation theory of planar dynamical systems, we have extracted the centre and saddle points and illustrated the phase portrait of such a system for some particular plasma parameters. Finally, we have graphically investigated the behaviour of the solitary energy wave by changing the plasma values as well as by calculating the instability criterion; we have also discussed the growth rate of the solitary waves. The results could be useful for studying the physical mechanism of nonlinear propagation of DIA solitary waves in laboratory and space plasmas where non-thermal electrons, pair-ions, and dust particles can exist. KEYWORDSdust-ion-acoustic solitary wave, the bifurcation theory, the Cairns-Gurevich distribution, the modified Zakharov-Kuznetsov equation, the reductive perturbation technique

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Collective mode properties in a paired fullerene-ion plasma

Cited by 106 publications

References 62 publications

Electrostatic modes in multi-ion and pair-ion collisional plasmas

Electrostatic modes in multi-ion and pair-ion collisional plasmas

Shear flow-driven electrostatic instabilities in low density and low temperature pair-ion plasmas with and without electrons

Dust‐ion‐acoustic solitary waves in a magnetized dusty pair‐ion plasma with Cairns‐Gurevich electrons and opposite polarity dust particles

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