Abstract Details
Abstracts
Author: Francois L Waelbroeck
Requested Type: Poster
Submitted: 2025-03-15 11:49:36
Co-authors: S. Cancino, J. Martinell and R. Fitzpatrick
Contact Info:
Univ. Texas at Austin
Speedway & Dean Keaton St.
Austin , TX 78712
USA
Abstract Text:
Plasma inhomogeneity can create magnetic islands through instabilities such as the classical, micro-tearing and neoclassical tearing modes (TM, MTM and NTM). Plasma inhomogeneity also affects how the plasma responds to applied resonant perturbations, such as those used for ELM control in tokamaks and for creating island divertors in stellarators. The IslET fluid model (Island Equilibrium and Transport) [1] that describes islands in inhomogeneous plasma has been extended to account for ion compressibility, which allows island chains to couple to drift-acoustic waves. The compressible IslET model completes the equilibrium solution of Smolyakov et al. [2] by specifying the relaxed form of the profiles (density, velocity and current) and in particular the degree to which they are flattened in the island. Analytic solutions of the IslET model will be presented in the “unmagnetized” regime. This regime (also called the “supersonic” regime [3]) is such that islands are wider than the width of the current channel found in linear theory but narrower than the ion-acoustic gyro-radius. The new solutions extend a previous analysis [3] by lifting the assumption that the phase velocity of the island is close to the electron drift velocity.
Characterization: 1.0
Comments: