We present a milli-seconds long pre L-H transiton simulation with the global edge turbulence code GDB. This study was carried out in a simple shifted circular flux surfaces magnetic configuration with IWL Alcator C-Mod parameters. The simulation domain is toroidally and poloidally global and spans 3 cm of the closed-flux region and 2 cm of the scrape-off layer (- 3 cm < r - a < 2 cm). The plasma is heated in the core region (r - a < - 3 cm) and sourced near the separatrix (r a). Several interesting features are exhibited in this simulation that concur with experiments, including enhanced E × B shear flow, suppressed turbulence, inward particle pinch and formation of pedestal via plasma heating. Detailed results and further analysis will be presented in the meeting.This work was supported by DOE-SC-0010508. This research used resources of the National Energy Research Scientific Computing Center.
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- October 2017