Abstract
This paper describes 1) representative results on excitation of energetic-particle mode (EPM) and toroidicityinduced Alfvén eigenmode (TAE) and consequent beam-ion losses in CHS, and 2) recent results on beam-ion transport and/or losses while EPMs are destabilized in LHD. Bursting EPMs and TAEs are often excited by co-injected beam ions in the high-beam ion pressure environment and give a significant effect on co-going beam ions in both experiments. It seems that in CHS, resonant beam ions are lost within a relatively short-time scale once they are anomalously transported due to energetic-ion driven MHD modes, whereas unlike CHS, redistribution of beam ions due to energetic-ion driven MHD modes is seen in LHD, suggesting that not all anomalously transported beam ions escape from the plasma.
Original language | English |
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Pages (from-to) | 540-545 |
Number of pages | 6 |
Journal | Contributions to Plasma Physics |
Volume | 50 |
Issue number | 6-7 |
DOIs | |
State | Published - Aug 2010 |
Keywords
- Compact helical system
- Energetic ion
- Large helical device
- MHD instabilities