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Measurement of Ion Concentration in the Unstirred Boundary Layer with Open Patch-Clamp Pipette: Implications in Control of Ion Channels by Fluid Flow
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Evidence for fast-ion transport by microturbulence.

W W Heidbrink1, J M Park, M Murakami

  • 1University of California, Irvine, CA 92697, USA.

Physical Review Letters
|November 13, 2009
PubMed
Summary

Turbulence causes energetic ion diffusion in DIII-D tokamak plasmas. Anomalies from classical predictions were observed, especially in hotter, lower-energy, and larger-radius plasmas.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Ion transport phenomena

Background:

  • Energetic ions are crucial for heating fusion plasmas.
  • Understanding their diffusion is key to controlling plasma stability and performance.
  • Neutral-beam injection (NBI) is a primary method for creating energetic ions in tokamaks.

Purpose of the Study:

  • To experimentally measure the cross-field diffusion of energetic ions driven by microturbulence.
  • To compare experimental observations with theoretical predictions of fast-ion transport.
  • To identify plasma conditions that influence the magnitude of anomalous diffusion.

Main Methods:

  • Utilized DIII-D tokamak experiments with neutral-beam injection.
  • Employed Fast-ion D-alpha spectroscopy, neutron measurements, and motional Stark effect diagnostics.
  • Analyzed the fast-ion distribution function to quantify diffusion.

Main Results:

  • Measured cross-field diffusion of energetic ions due to plasma microturbulence.
  • Observed that diffusion anomalies compared to classical theory are most pronounced in high-temperature plasmas.
  • Anomalies were also greater at lower fast-ion energies and larger minor radii.

Conclusions:

  • Experimental measurements confirm the significant role of microturbulence in energetic ion diffusion.
  • The observed diffusion characteristics align with theoretical expectations for turbulent transport.
  • Findings provide crucial data for validating and improving theoretical models of fast-ion behavior in fusion plasmas.