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Feedback stabilization of multiple resistive wall modes.

P R Brunsell1, D Yadikin, D Gregoratto

  • 1Division of Fusion Plasma Physics (Association EURATOM/VR), Alfvén Laboratory, Royal Institute of Technology, 10044 Stockholm, Sweden.

Physical Review Letters
|December 17, 2004
PubMed
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Active feedback successfully stabilized multiple resistive wall modes in a reversed-field pinch plasma. This method also prolonged plasma discharge by affecting tearing modes, demonstrating its effectiveness.

Area of Science:

  • Plasma physics
  • Fusion energy research
  • Magnetohydrodynamics

Background:

  • Resistive wall modes (RWMs) can destabilize plasma confinement in fusion devices.
  • Controlling RWMs is crucial for achieving sustained fusion reactions.
  • Previous methods for RWM stabilization have limitations.

Purpose of the Study:

  • To experimentally demonstrate active feedback stabilization of multiple independent RWMs.
  • To investigate the effects of feedback stabilization on plasma discharge duration.
  • To analyze the coupling between different RWMs and tearing modes.

Main Methods:

  • Utilizing an active feedback system with multiple coils.
  • Applying feedback control to a reversed-field pinch plasma.

Related Experiment Videos

  • Observing and analyzing plasma behavior, including mode suppression and discharge length.

    • Main Results:

    • Reproducible simultaneous suppression of several nonresonant RWMs was achieved.
    • Observed coupling of different modes due to limited feedback coils, consistent with theoretical predictions.
    • Feedback stabilization of RWMs led to a significant prolongation of the plasma discharge pulse.

    Conclusions:

    • Active feedback is an effective method for stabilizing multiple RWMs in a reversed-field pinch.
    • The technique shows potential for enhancing plasma confinement and extending discharge durations.
    • Understanding mode coupling is important for optimizing feedback control strategies.