Bifurcation of resistive wall mode dynamics predicted by magnetohydrodynamic-kinetic hybrid theory

Bifurcation of resistive wall mode dynamics predicted by magnetohydrodynamic-kinetic hybrid theory

Bifurcation of resistive wall mode dynamics predicted by magnetohydrodynamic-kinetic hybrid theory 150 150 UKAEA Opendata
CCFE-PR(15)75

Bifurcation of resistive wall mode dynamics predicted by magnetohydrodynamic-kinetic hybrid theory

The magnetohydrodynamic-kinetic hybrid theory has been extensively and successfully applied for interpreting experimental observations of macroscopic, low frequency instabilities, such as the resistive wall mode, in fusion plasmas. In this work, it is discovered that an analytic version of the hybrid formulation predicts a bifurcation of the mode dynamics while varying certain physical parameters of the plasma, such as the thermal particle collisionality or the ratio of the thermal ion to electron temperatures. This bifurcation can robustly occur under reasonably large parameter spaces as well as with different assumptions, for instance, on the particle collision model. Qualitatively similar bifurcation features are also observed in full toroidal computations based on a non-perturbative hybrid formulation.

Collection:
Journals
Journal:
Physics of Plasmas
Publisher:
AIP
Published date:
09/01/2015