Abstract Details
Abstracts
Author: Hideaki Miura
Requested Type: Poster
Submitted: 2017-03-18 20:24:15
Co-authors: L.Zheng, W.Horton
Contact Info:
National Institute for Fusion Science
322-6
Toki, Gifu 509-529
Japan
Abstract Text:
Numerical simulations of interchange/tearing instabilities in 2D slab with a numerical model for edge plasma are carried out. One of characteristics in the edge region of a torus system is that the magnetic field consists of open magnetic field lines outside the Last Closed Flux Surface (LCFS), while it consists of closed field lines in the inner side of the LCFS. In the outer side of LCFS, or the scrape-off layer (SOL), electrons move faster than ions toward the divetor plates, causing the SOL current to be saturated. Consequently, there is a current jump across the LCFS. We develop a numerical model, a sort of current diffusivity, which enforces such a jump in the current density field. It is shown by numerical simulations in 2D slab with the model that the interchange instabilities can be converted into the tearing instabilities there. We discuss the applicability of the model to the tokamak edge stability and ELM studies.
Comments: