| 51. |
- Shukla, P K, et al.
(författare)
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Potential distribution around a charged dust grain in an electronegative plasma
- 2010
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Ingår i: JOURNAL OF PLASMA PHYSICS. - : Cambridge University Press. - 0022-3778 .- 1469-7807. ; 76, s. 673-676
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Tidskriftsartikel (refereegranskat)abstract
- The potential distribution around a charged dust grain in an electronegative plasma is obtained by using the appropriate dielectric susceptibilities for the Boltzmann distributed electrons and negative ions, and for the inertial positive ions that are streaming from the bulk plasma into the electronegative plasma sheath. The existence of oscillatory ion wakefields is shown. Positive ions are trapped/focused in the ion wakefields, and subsequently the negative dust particles are attracted to each other, forming ordered dust structures.
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| 52. |
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| 53. |
- Shukla, P K, et al.
(författare)
-
Stimulated scattering of electromagnetic waves carrying orbital angular momentum in quantum plasmas
- 2012
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Ingår i: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. - : American Physical Society. - 1539-3755 .- 1550-2376. ; 86:1, s. 016403-
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Tidskriftsartikel (refereegranskat)abstract
- We investigate stimulated scattering instabilities of coherent circularly polarized electromagnetic (CPEM) waves carrying orbital angular momentum (OAM) in dense quantum plasmas with degenerate electrons and nondegenerate ions. For this purpose, we employ the coupled equations for the CPEM wave vector potential and the driven (by the ponderomotive force of the CPEM waves) equations for the electron and ion plasma oscillations. The electrons are significantly affected by the quantum forces (viz., the quantum statistical pressure, the quantum Bohm potential, as well as the electron exchange and electron correlations due to electron spin), which are included in the framework of the quantum hydrodynamical description of the electrons. Furthermore, our investigation of the stimulated Brillouin instability of coherent CPEM waves uses the generalized ion momentum equation that includes strong ion coupling effects. The nonlinear equations for the coupled CPEM and quantum plasma waves are then analyzed to obtain nonlinear dispersion relations which exhibit stimulated Raman, stimulated Brillouin, and modulational instabilities of CPEM waves carrying OAM. The present results are useful for understanding the origin of scattered light off low-frequency density fluctuations in high-energy density plasmas where quantum effects are eminent.
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| 54. |
- Stenflo, Lennart, et al.
(författare)
-
Collisional contribution to stimulated scattering in plasmas
- 2014
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Ingår i: Physics Letters A. - : Elsevier. - 0375-9601 .- 1873-2429. ; 378:5-6, s. 549-550
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Tidskriftsartikel (refereegranskat)abstract
- The influence of collisions on stimulated Brillouin scattering in magnetized plasmas is discussed. It is shown that new effects occur when the magnitude of the electron quiver velocity exceeds the electron thermal velocity.
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| 55. |
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| 56. |
- Stenflo, Lennart, 1939-, et al.
(författare)
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Decay interactions involving two electrostatic waves and one arbitrary polarized wave in a magnetized plasma
- 2010
-
Ingår i: AIP Conference Proceedings. - : AIP. - 0094-243X .- 1551-7616. ; 1306, s. 14-17
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Tidskriftsartikel (refereegranskat)abstract
- We demonstrate that previously overlooked formulations of the general theory are highly useful when deriving concrete expressions for specific cases. We also point out that some previous results deduced directly from the basic plasma equations contain inappropriate approximations leading to unphysical results. Finally, the generalization to more elaborate plasma models, containing e.g. kinetic effects, is presented.
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| 57. |
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| 58. |
- Stenflo, Lennart, et al.
(författare)
-
Large amplitude circularly polarized waves in quantum plasmas
- 2010
-
Ingår i: JOURNAL OF PLASMA PHYSICS. - : Cambridge University Press. - 0022-3778 .- 1469-7807. ; 76, s. 261-265
-
Tidskriftsartikel (refereegranskat)abstract
- Some previous dispersion relations for large amplitude waves in plasmas are generalized so that also quantum effects are included.
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| 59. |
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| 60. |
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