Simulation of micro-tearing modes
Event details
| Date | 01.05.2015 |
| Hour | 10:30 › 11:30 |
| Speaker | Michail-Savvas Anastopoulos-Tzanis, Univ. of York, UK |
| Location |
PPB 019
|
| Category | Conferences - Seminars |
Micro-tearing modes (MTMs) are considered as an additional candidate for explaining enhanced electron transport in present and future tokamaks. MTMs are destabilised due to the existence of electron temperature gradient ∇Te in the semi-collisional regime nei/w*ne > 1. However, gyro-kinetic simulations revealed that MTMs are destabilised even in the collision-less nei/w*ne ≪ 1 regime indicating the existence of additional drive mechanisms and possible contribution from magnetic drifts. A review of the linear dispersion relation in the collision-less regime in slab geometry, resulted in negative growth rate indicating stability. Further simulations of the full linear problem in cylindrical geometry using the GS2 code, were in accordance with previous simulations and the complex frequency of the system agreed qualitatively with analytic theory. Moreover, extension to toroidal geometry revealed the strong destabilising influence of magnetic gradient drifts and trapped particle effects. However, the effect of curvature drifts was found to have minute influence for further destabilisation. Finally, MTMs were found to change drive for large values of the electric resistivity he, which was accompanied by destabilisation in the collision-less regime.
Practical information
- Informed public
- Free
Organizer
- Prof. P. Ricci
Contact
- Prof. P. Ricci