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Resistive wall mode in collisionless quasistationary plasmas
1Laboratory for Laser Energetics and Department of Mechanical Engineering, University of Rochester, Rochester, New York 14623, USA.
Physical Review Letters
|September 28, 2004
Summary
This study shows trapped particles and resonance improve tokamak plasma stability limits. Slow rotation can fully suppress resistive wall modes, enhancing plasma performance.
Area of Science:
- Plasma Physics
- Fusion Energy Research
- Magnetohydrodynamics
Background:
- Resistive wall modes (RWMs) can destabilize tokamak plasmas.
- Beta limits, a measure of plasma pressure relative to magnetic field pressure, are crucial for fusion reactor efficiency.
- Understanding RWM stability is essential for achieving sustained fusion reactions.
Purpose of the Study:
- To analyze the stability of the n=1 resistive wall mode in a simplified collisionless tokamak plasma model.
- To investigate the impact of trapped particle compressibility and precession drift resonance on RWM stability.
- To determine conditions for suppressing RWMs and improving beta stability limits.
Main Methods:
- Stability analysis of the n=1 resistive wall mode.
- Utilizing a simplified model of collisionless tokamak plasma.
- Investigating the effects of trapped particle compressibility and precession drift resonance.
Main Results:
- Trapped particle compressibility significantly improves beta stability limits.
- Resonance between the RWM and the precession drift frequency enhances stability.
- Full suppression of the RWM is achievable with slow plasma rotation, allowing stability up to wall beta limits.
Conclusions:
- Trapped particles and specific resonances are key factors in enhancing tokamak plasma stability.
- Slow plasma rotation offers a viable pathway to fully suppress RWMs.
- The findings suggest improved operational regimes for future fusion devices.