Edge stability of stationary ELM-suppressed regimes on DIII-D

SOL and pedestal density profile evolution during DIII-D ELMy and ELM-suppressed H-mode operation

A fast profile reflectometer has been used to study the detailed characteristics of scrape-off-layer (SOL) and pedestal density profile evolution in DIII-D ELMy H-mode plasmas with high temporal (P10 ls) and spatial ( 4 mm) resolution. Results show a significant enhancement in radial particle transport to the outer vessel wall during Type-I ELMs. The radial particle transport time ( 140 ls) bec...

1 Edge dimensionless identity experiment on DIII - D and Alcator

Experiments were carried out to study the similarity of H-mode (High confinement mode) physics on the Alcator C-Mod [1] and DIII-D [2] tokamaks comparing plasmas with matched local edge dimensionless parameters (β, ρ∗, ν∗, q95) and shape (ε, κ, δ). It was observed that matching local values of the dimensionless parameters on top of the H-mode pedestals produces similar Te and ne profiles across...

Divertor heat loads in RMP ELM controlled H-mode plasmas on DIII-D

In this paper the manipulation of power deposition on divertor targets at DIII-D by application of resonant magnetic perturbations (RMPs) is analysed. It has been found that heat transport shows a different reaction to the applied RMP depending on the plasma pedestal collisionality. At pedestal electron collisionality above 0.5 the heat flux during the ELM suppressed phase is of the same order ...

Transport of Elm Energy and Particles into the Sol and Divertor of Diii–d

We report on DIII–D data that reveal the underlying processes responsible for transport of energy and particles from the edge pedestal to the divertor target during Type I edge-localized modes (ELMs). The separate convective and conductive transport of energy due to an ELM is determined by Thomson scattering measurements of electron density and temperature in the pedestal. Conductive transport ...

Diii-d Edge Physics and Disruptions Fy04-06 Progress Report