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Related Experiment Videos

Island dynamics in the large-helical-device plasmas.

N Ohyabu1, K Ida, T Morisaki

  • 1National Institute for Fusion Science, Toki, Gifu 509-5292, Japan.

Physical Review Letters
|February 28, 2002
PubMed

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Summary

In Large Helical Device plasma, collisionless conditions with finite beta significantly reduce externally imposed 1/1 islands. Collisional plasmas with finite beta enlarge islands above a specific vacuum island size threshold.

Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Magnetohydrodynamics

Background:

  • Understanding plasma behavior in fusion devices is crucial.
  • Externally imposed magnetic islands can affect plasma confinement.
  • Plasma collisionality and beta (plasma pressure to magnetic pressure ratio) are key parameters influencing plasma stability.

Purpose of the Study:

  • To investigate the impact of plasma collisionality and finite beta on externally imposed magnetic islands.
  • To determine the conditions under which magnetic island size changes in the Large Helical Device.
  • To identify thresholds for magnetic island enlargement in fusion plasmas.

Main Methods:

  • Analysis of plasma discharges in the Large Helical Device.
  • Measurement of externally imposed island size.

Related Experiment Videos

  • Correlation of island size with plasma parameters like collisionality (nu*) and beta.

    • Main Results:

    • A substantial decrease in 1/1 island size was observed in collisionless plasmas (nu* < 1) with finite beta (> 0.1%).
    • In collisional plasmas with finite beta, island size increased.
    • A threshold in vacuum island size was identified, below which enlargement did not occur.

    Conclusions:

    • Plasma collisionality and finite beta play critical roles in magnetic island dynamics.
    • Collisionless regimes with finite beta can suppress magnetic islands, potentially improving plasma confinement.
    • The existence of a threshold for island enlargement suggests complex nonlinear interactions within the plasma.