Abstract Details
| status: | file name: | submitted: | by: |
|---|---|---|---|
| approved | sher25summary.pdf | 2025-03-28 20:32:38 | Jesus Ramos |
Abstracts
Author: Jesus J. Ramos
Requested Type: Poster
Submitted: 2025-03-12 12:19:13
Co-authors:
Contact Info:
Universidad Carlos III de Madrid
Avenida de la Universidad
Leganes (Madrid), 28911
Spain
Abstract Text:
A simple, analytically tractable kinetic model for the perpendicularly-propagating branch of the linear ion-temperature-gradient instability is discussed. It assumes two-dimensional planar dynamics perpendicular to the magnetic field, hence the parallel derivatives and the magnetic curvature are zero. On the other hand,the magnitude of the magnetic field is assumed inhomogeneous and the kinetic resonance associated with the grad-B particle drift is taken into account. The ions are described with a drift-kinetic equation for mode wavelengths much larger than their Larmor radii and the electrons are treated as adiabatic. The local dispersion relation involves standard elementary and special functions and depends on two basic dimensionless parameters that are two specific combinations of the gradients of the ion density, the ion temperature and the magnetic field magnitude, and the ratio between the ion and electron temperatures. The resonant and non-resonant parts of the instability threshold in parameter space are determined analytically. The fluid model that corresponds to the assumptions made in the kinetic model is also discussed, with a fluid closure hypothesis that best approximates the kinetic result.
Characterization: 1.0
Comments: