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Magnetically Induced Rotating Rayleigh-Taylor Instability

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Published on: March 3, 2017

Physics of Edge-Core Coupling by Inward Turbulence Propagation.

Mingyun Cao¹, P H Diamond¹

¹University of California-San Diego, Departments of Physics and Astronomy and Astrophysics, San Diego, California, USA.

Physical Review Letters

|June 27, 2025

Summary

This summary is machine-generated.

Inward-propagating voids, generated by turbulence, can energize magnetically confined fusion plasmas. This newly understood mechanism drives a broad turbulent layer, potentially resolving plasma energy shortfall problems.

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Area of Science:

Plasma Physics
Fusion Energy
Turbulence Dynamics

Background:

Edge-core coupling is crucial for optimizing magnetically confined fusion plasmas.
Inward turbulence propagation was speculated to energize the edge-core region, but the mechanism was unclear.
Recent experiments observed blob-void pairs near the last closed flux surface.

Purpose of the Study:

To elucidate the mechanism of inward void propagation and its impact on plasma dynamics.
To demonstrate how void emission can drive turbulent layers in fusion plasmas.
To investigate the role of Cherenkov emission in this process.

Main Methods:

Theoretical modeling of void emission and drift wave interaction.
Analysis of experimental observations of blob-void pairs.
Simulations of turbulent layer formation driven by inward-propagating voids.

Main Results:

Void emission was identified as a significant driver of broad turbulent layers (width ~100 ρs).
The Cherenkov emission of drift waves from inward-propagating voids is the proposed mechanism.
This process can stir the core plasma and energize the edge-core coupling region.

Conclusions:

The heretofore ignored process of void emission is a key mechanism in fusion plasma edge-core coupling.
This model offers a potential solution to the plasma energy shortfall problem.
Understanding void dynamics is essential for controlling strong turbulence in fusion devices.