Effects of finite electron temperature on gradient drift instabilities in partially magnetized plasmas

The gradient-drift instabilities of partially magnetized plasmas in plasma devices with crossed electric and magnetic fields are investigated in the framework of the two-fluid model with finite electron temperature in an inhomogeneous magnetic field. The finite electron Larmor radius (FLR) effects are also included via the gyroviscosity tensor taking into account the magnetic field gradient. This model correctly describes the electron dynamics for k⊥ ρe>1 in the sense of Padé approximants (here, k⊥ and ρe are the wavenumber perpendicular to the magnetic field and the electron Larmor radius, respectively). The local dispersion relation for electrostatic plasma perturbations with the frequency in the range between the ion and electron cyclotron frequencies and propagating strictly perpendicular to the magnetic field is derived. The dispersion relation includes the effects of the equilibrium E×B electron current, finite ion velocity, electron inertia, electron FLR, magnetic field gradients, and Debye length effects. The necessary and sufficient condition of stability is derived, and the stability boundary is found. It is shown that, in general, the electron inertia and FLR effects stabilize the short-wavelength perturbations. In some cases, such effects completely suppress the high-frequency short-wavelength modes so that only the long-wavelength low-frequency (with respect to the lower-hybrid frequency) modes remain unstable. © 2018 Author(s).

Lakhin V.P. 1, 2 , Ilgisonis V.I. 2, 3 , Smolyakov A.I. 1, 2, 4 , Sorokina E.A. 1, 2 , Marusov N.A. 1, 2, 5
Номер выпуска
  • 1 NRC Kurchatov Institute, 1 Kurchatov Sq., Moscow, 123182, Russian Federation
  • 2 Peoples' Friendship University of Russia, RUDN University, 3 Ordzhonikidze St., Moscow, 117198, Russian Federation
  • 3 State Atomic Energy Corporation ROSATOM, 24 Bolshaya Ordynka St., Moscow, 119017, Russian Federation
  • 4 University of Saskatchewan, 116 Science Place, Saskatoon, SK S7N 5E2, Canada
  • 5 Moscow Institute of Physics and Technology, 9 Institutskiy per., Dolgoprudny, 141701, Russian Federation
Ключевые слова
Cyclotrons; Dispersion (waves); Dispersions; Electrons; Magnetic field effects; Magnetic fields; Magnetism; Magnetoplasma; Plasma diagnostics; Quantum theory; Two phase flow; Wave plasma interactions; Crossed electric and magnetic fields; Dispersion relations; Electron cyclotron frequency; Gradient-drift instability; Inhomogeneous magnetic field; Magnetic field gradient; Magnetized plasmas; Stability boundaries; Electron temperature
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