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Vortex-induced diffusivity in reversed field pinch plasmas.

M Spolaore1, V Antoni, E Spada

  • 1Consorzio RFX, Associazione EURATOM-ENEA sulla fusione, C.so Stati Uniti 4, I-35127, Padova, Italy.

Physical Review Letters
|December 17, 2004
PubMed
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Coherent structures in reversed field pinch experiments, like dipolar and monopolar vortices, significantly contribute to anomalous plasma transport. Their impact on plasma diffusivity is minimized when vortex populations are balanced, suggesting a new transport model.

Area of Science:

  • Plasma physics
  • Fusion energy research
  • Magnetohydrodynamics

Background:

  • Reversed field pinch (RFP) devices are crucial for fusion energy research.
  • Understanding anomalous transport is key to achieving controlled fusion.
  • Coherent structures in plasma are known but their transport contribution is not fully quantified.

Purpose of the Study:

  • To interpret coherent structures in RFP experiments as a balance of vortices.
  • To quantify the contribution of these structures to anomalous transport in fusion plasmas.
  • To investigate the relationship between vortex population and plasma diffusivity.

Main Methods:

  • Analysis of coherent structures in two reversed field pinch experiments.
  • Interpretation of structures as dynamic balance of dipolar and monopolar vortices.

Related Experiment Videos

  • Estimation of the contribution of coherent structures to anomalous plasma transport.

    • Main Results:

    • Coherent structures are identified as a dynamic balance of dipolar and monopolar vortices influenced by ExB flow shear.
    • These structures account for up to 50% of total plasma diffusivity in fusion-related plasmas.
    • The diffusion coefficient is minimized when the populations of dipolar and monopolar vortices are equal.

    Conclusions:

    • Coherent structures play a significant role in anomalous transport in RFP plasmas.
    • The balance between dipolar and monopolar vortices is critical for minimizing plasma diffusivity.
    • An interpretative model is proposed to explain the observed dependence of diffusion on vortex populations.