Global 3D Braginskii-based edge simulation of an L-H transition

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 ($r{\approx}a$). Several interesting features are exhibited in this simulation that concur with experiments, including enhanced $E{\times}B$ 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.