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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Divertor Physics

Background:

  • Edge-Localized Modes (ELMs) are plasma instabilities in fusion devices.
  • Resonant Magnetic Perturbations (RMPs) are used to suppress ELMs.
  • Understanding divertor dynamics is crucial for future fusion reactors.

Purpose of the Study:

  • To investigate the structure and dynamics of particle flux lobes induced by RMPs.
  • To compare particle flux measurements with heat flux measurements in DIII-D.
  • To validate plasma response models to RMPs.

Main Methods:

  • Fast visible imaging of D2 emission (601 nm) from the lower divertor.
  • High spatial resolution (2-4 mm/pixel) imaging over 40° toroidal angle.
  • Coupling imaging to a high-temporal-resolution camera (Phantom 7.3).

Main Results:

  • Spatially resolved D2 emission peaks, indicating particle flux lobes, were observed.
  • These particle flux structures were more spatially defined than heat fluxes measured by IR cameras.
  • Lobe dynamics were resolved between ELMs and during ELM suppression onset.

Conclusions:

  • Visible imaging provides a valuable tool for studying 3D plasma structures in the divertor.
  • RMP-induced particle flux lobes have distinct spatial characteristics compared to heat fluxes.
  • Measurements aid in validating models of plasma behavior under RMPs.