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Related Experiment Videos

How turbulence fronts induce plasma spin-up.

Y Kosuga1,2, S-I Itoh1,2, P H Diamond3

  • 1Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan.

Physical Review. E
|April 19, 2017
PubMed
Summary

Turbulence fronts drive toroidal plasma spin-up by radially propagating. Fluctuation momentum spreads faster than mean flow, enabling edge-core coupling in toroidal flows.

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Area of Science:

  • Plasma physics
  • Fluid dynamics
  • Turbulence theory

Background:

  • Toroidal plasmas are crucial for fusion energy research.
  • Understanding plasma spin-up mechanisms is key to controlling plasma behavior.
  • Turbulence plays a significant role in plasma dynamics.

Purpose of the Study:

  • To describe the spin-up of toroidal plasmas.
  • To investigate the role of turbulence fronts in plasma dynamics.
  • To analyze the momentum flux associated with turbulence.

Main Methods:

  • Utilizing a two-scale direct-interaction approximation.
  • Analyzing the weak turbulence limit.
  • Calculating the flux of parallel momentum.

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Main Results:

  • Turbulence fronts with broken parallel symmetry drive plasma spin-up.
  • Fluctuation momentum spreads faster than mean flow momentum.
  • Turbulent wave momentum flux exceeds the momentum pinch.

Conclusions:

  • The scattering of fluctuation momentum can induce edge-core coupling of toroidal flows.
  • Findings align with experimental observations of toroidal flow coupling.
  • This work provides a theoretical basis for understanding turbulence-driven plasma dynamics.