| 1. |
- Karimov, A. R., et al.
(författare)
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The processes of nonequilibrium exchange in rotating plasma flows
- 2016
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Ingår i: II CONFERENCE ON PLASMA & LASER RESEARCH AND TECHNOLOGIES. - : IOP Publishing.
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Konferensbidrag (refereegranskat)abstract
- The mechanisms of energy/momentum exchange in rotating and compressing plasma flows have been discussed. It has been shown that such flows are capable of transforming the energy of different degrees of freedom into the energy of one degree owing to the interaction of the coupled nonlinear radial, axial and azimuthal electron-ion oscillations. These processes may lead to the additional acceleration of the flow in azimuthal or axial direction so they might be instrumental for the creation of space thrusters employing pulse transformations for propulsion.
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| 2. |
- Onishchenko, O. G., et al.
(författare)
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Finite ion Larmor radius effects in magnetic curvature-driven Rayleigh-Taylor instability
- 2011
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Ingår i: AIP Conference Proceeding Joint ITER-IAEA-ICTP Advanced Workshop on Fusion and Plasma Physics. - : American Institute of Physics (AIP). - 9780735410411 ; , s. 68-73
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Incomplete finite ion Larmor radius stabilization of the magnetic Rayleigh-Taylor (RT)instability is investigated. In contrast to the previous studies the effects of both the gravity and magnetic field curvature are taken into account. New model hydrodynamic equations describing nonlinear flute waves with arbitrary spatial scales have been derived. Particular attention is paid to the waves with spatial scales of the order of the ion Larmor radius. In the linear approximation a Fourier transform of these equations yields a generalized dispersion relation for flute waves. The condition for gravity and magnetic curvature at which the instability cannot be stabilized by the finite ion Larmor radius effects is found. It is shown that in the absence of the magnetic curvature the complete stabilization arises due to the cancellation of gravitational and diamagnetic drifts. However, when the magnetic curvature drift is taken into account this synchronization is violated and the RT instability is stabilized at more complex conditions. Furthermore, the dependence of the instability growth rate on the equilibrium plasma parameters is investigated.
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| 3. |
- Shukla, Padma Kant, et al.
(författare)
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Compressional Alfvénic shocks and solitary waves in plasmas
- 2011
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Ingår i: Joint ITER-IAEA-ICTP Advanced Workshop on Fusion and Plasma Physics. - : American Institute of Physics (AIP). - 9780735410411 ; , s. 2-14
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- We present a review of recent results for compressional Alfvénic shocks and solitary waves in electron-ion and electron-positron plasmas, which are governed by the two-fluid equations, coupled with Faraday's and Ampère's laws. We consider large amplitude compressional Alfvénic shock waves and solitary pulses in a warm collisional electron-ion (e-i) magnetoplasma, and large amplitude compressional Alfvénic solitary pulses in magnetized e-i and electron-positron (e-p) plasmas. These nonlinear structures can exist in well defined speed ranges above the Alfvén speed. They can be associated with localized electromagnetic field excitations in magnetized laboratory and space plasmas that are composed of electrons, ions, and/or positrons.
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| 4. |
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| 5. |
- Stenflo, Lennart, et al.
(författare)
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Wave-wave interactions in plasmas
- 2009
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Ingår i: From Leonardo to Iter: NonLinear and Coherence Aspects. - : American Institute of Physics. - 9780735407169 ; , s. 4-9
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Konferensbidrag (refereegranskat)abstract
- The interaction of large amplitude electromagnetic waves with plasmas is considered. We first show how a pump wave can excite sidebands and different types of low-frequency electrostatic waves, and then derive dispersion relations which include three-wave as well as four-wave coupling mechanisms. An expression for the pump wave enhanced electric field fluctuation spectrum is also deduced. In this way it is thus possible to describe stimulated electromagnetic emissions in the ionospheric plasma as well as in ultracold quantum plasmas. Finally, we mention the possibility of elucidating scattering instabilities even in the absence of the plasma. This is an interesting quantum electrodynamic effect.
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