High confinement mode (H-mode) discharges with peaked toroidal current density profile (high internal inductance, li) and improved confinement are obtained in the DIII-D tokamak by dynamically varying the current profile using a rapid elongation ramp technique. The confinement improvement increases with li and persists in the presence of edge-localized modes. The plasma toroidal rotation and the corresponding radial electric field component also increase with the peakedness of the current density profile.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)