Conveners
Waves & Energetic Particles: EX/5 & TH/4
- Eric Fredrickson (USA)
Mr
Go Matsunaga
(Japan)
11/10/2012, 10:45
EXS - Magnetic Confinement Experiments: Stability
Oral Presentation
In the wall-stabilized high-beta plasmas in JT-60U and DIII-D, interesting interactions of energetic particle (EP) driven modes and MHD modes have been observed. First, EP-driven modes trigger resistive wall modes (RWMs) and edge localized modes (ELMs).
In both devices, EP-driven modes have been observed in the high-beta plasmas above the no-wall beta limit; these modes are called `Energetic...
Mr
Herbert L. Berk
(USA)
11/10/2012, 11:05
THW - Magnetic Confinement Theory and Modelling: Wave–plasma interactions; current drive; heating; energetic particles
Oral Presentation
Investigating the relaxation of energetic particles (EP) with MHD modes is an area where ideal and kinetic theories need to be investigated to enable credible planning for future self-sustained burning plasmas. These theories need to be tested with predictions of present day experiments. Here we discuss two aspects to the relaxation. A. The effect of frequently observed long-range frequency...
Mr
Satoshi Yamamoto
(Japan)
11/10/2012, 11:25
EXW - Magnetic Confinement Experiments: Wave–plasma interactions; current drive; heating; energetic particles
Oral Presentation
We discuss the features of energetic-ion-driven MHD instabilities such as Alfvén eigenmodes (AEs) in three-dimensional magnetic configuration with low magnetic shear and low toroidal field period number (Np) that are characteristic of advanced helical plasmas. Comparison of experimental and numerical studies in Heliotron J with those in TJ-II indicates that the most unstable AE is global AE...
Mr
Fulvio Zonca
(Associazione EURATOM-ENEA sulla Fusione)
11/10/2012, 11:45
THW - Magnetic Confinement Theory and Modelling: Wave–plasma interactions; current drive; heating; energetic particles
Oral Presentation
Zonal flows and, more generally, zonal structures are known to play important self-regulatory roles in the dynamics of microscopic drift-wave type turbulences. Since Toroidal Alfvén Eigenmode (TAE) plays crucial roles in the Alfvén wave instabilities in burning fusion plasmas, it is, thus, important to understand and assess the possible roles of zonal flow/structures on the nonlinear dynamics...
Mr
Wei Chen
(China)
11/10/2012, 12:05
EXW - Magnetic Confinement Experiments: Wave–plasma interactions; current drive; heating; energetic particles
Oral Presentation
The very low-frequency (LF) Alfvénic and acoustic fluctuations, such as beta-induced Alfvén eigenmode (BAE), and geodesic acoustic mode (GAM), are presently of considerable interest in the present-day fusion and future burning plasmas. The low-frequency waves can significantly affect the plasma performance, and induce the particle losses and reduce the plasma self-heating. These LF...
