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Alpha-channeling simulation experiment in the DIII-D tokamak
K L Wong1, R Budny, R Nazikian
1Plasma Physics Laboratory, Princeton University, Princeton, NJ 08543, USA.
Physical Review Letters
|September 28, 2004
Summary
Alfvén instabilities help sustain steady-state internal transport barriers by redistributing energetic ions. This mechanism may improve burning plasma performance in fusion energy research.
Area of Science:
- Plasma physics
- Fusion energy research
- Magnetohydrodynamics
Background:
- Alfvén instabilities are known to affect plasma confinement.
- Energetic ions play a crucial role in plasma dynamics.
- Internal transport barriers (ITBs) are important for achieving high plasma performance.
Purpose of the Study:
- To investigate the role of Alfvén instabilities in sustaining internal transport barriers.
- To demonstrate this mechanism in a tokamak experiment.
- To discuss the potential for improving burning plasma performance.
Main Methods:
- Analysis of experimental data from the DIII-D tokamak.
- Investigating the redistribution of energetic ions by Alfvén instabilities.
- Assessing the impact on central magnetic shear and ITB sustainment.
Main Results:
- Alfvén instabilities were shown to reduce central magnetic shear.
- This reduction was achieved through the redistribution of energetic ions.
- A steady-state internal transport barrier was sustained by this process.
Conclusions:
- Alfvén instabilities can actively sustain internal transport barriers.
- Energetic ion redistribution is a key mechanism.
- This finding has implications for future fusion reactor designs and performance enhancement.