The linear stability analysis of the ITG modes in a plasma slab with an equilibrium ion flow has been carried out by solving the relevant eigenvalue equation for the complex electrostatic fluctuation amplitude ~?k, by retaining the electric, the diamagnetic and the gravitational-like drifts. For sufficiently broad Ti profiles, a novel regime with two-branch distributions of unstable eigenvalues has been found, which seems to be characterized by a broad radial correlation length. The plasma density profile and a macroscopic ion flow aligned to the magnetic field govern the relative importance of the two unstable sets of eigenfunctions.
Global stability analysis of ITG modes in the presence of a field-aligned ion flow
Lontano M;Lazzaro E
2008
Abstract
The linear stability analysis of the ITG modes in a plasma slab with an equilibrium ion flow has been carried out by solving the relevant eigenvalue equation for the complex electrostatic fluctuation amplitude ~?k, by retaining the electric, the diamagnetic and the gravitational-like drifts. For sufficiently broad Ti profiles, a novel regime with two-branch distributions of unstable eigenvalues has been found, which seems to be characterized by a broad radial correlation length. The plasma density profile and a macroscopic ion flow aligned to the magnetic field govern the relative importance of the two unstable sets of eigenfunctions.File in questo prodotto:
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