SIMULATION OF THE SCRAPE-OFF LAYER PLASMA DURING A DISRUPTION

The evolution of the scrape-off layer (SOL) during a disruption in the DIII-D tokamak is modeled using the 2-D UEDGE transport code. The foc us is on the thermal quench phase when most of the energy content of t he discharge is rapidly transported across the magnetic separatrix whe re it then flows to material surfaces or is radiated. Comparisons betw een the simulation and an experiment on the DIII-D tokamak are made wi th the heat flux to the divertor plate, and temperature and density pr ofiles at the SOL midplane. The temporal response of the heat flux to the divertor plate is calculated. The sensitivity of the solution to a ssumptions of electron heat-flux models and impurity radiation is inve stigated.