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Sökning: WFRF:(Stenflo Lennart) > Konferensbidrag > (2011)

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1.
  • Onishchenko, O. G., et al. (författare)
  • Finite ion Larmor radius effects in magnetic curvature-driven Rayleigh-Taylor instability
  • 2011
  • 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
  • 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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2.
  • Shukla, Padma Kant, et al. (författare)
  • Compressional Alfvénic shocks and solitary waves in plasmas
  • 2011
  • Ingår i: Joint ITER-IAEA-ICTP Advanced Workshop on Fusion and Plasma Physics. - : American Institute of Physics (AIP). - 9780735410411 ; , s. 2-14
  • 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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  • Resultat 1-2 av 2
Typ av publikation
konferensbidrag  (2)Ta bort avgränsningen
Typ av innehåll
övrigt vetenskapligt/konstnärligt (2)
Författare/redaktör
Stenflo, Lennart (2)
Shukla, Padma Kant (1)
Shukla, Padma K (1)
Eliasson, Bengt (1)
Pokhotelov, O. A. (1)
Onishchenko, O G (1)
Lärosäte
Linköpings universitet (2)
Språk
Engelska (2)
År
2011 (2)Ta bort avgränsningen

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