Speaker
Francesco Porcelli
(Politecnico di Torino)
Description
Recent progress on the theory, numerical simulations, and experimental observations of Vertical Displacement Oscillatory Modes (VDOM) in tokamak experiments is reported. VDOM are axisymmetric modes (toroidal mode number n=0) driven unstable by energetic particles and can have an impact on plasma disruptions, plasma edge stability and confinement. They are a candidate to explain Alfvén-frequency n=0 modes recently observed on JET, TCV, and MAST-U. The specific types of fast ion distribution functions that can provide an instability drive for VDOM are discussed. Numerical results obtained by the NIMROD code regarding the simulation of n=0 modes driven by fast ions are shown.
Author
Francesco Porcelli
(Politecnico di Torino)
Co-authors
Dr
Debabrata Banerjee
(Politecnico di Torino)
Simone Cavallero
(Politecnico di Torino)
Dr
Charlson Kim
(SLS2 Consulting)
