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Investigation of the role of pedestal pressure and collisionality on type-I ELM divertor heat loads in DIII-D
A non-dimensional collisionality scan conducted on DIII-D confirms a model for ELM energy densities recently put forward by Eich , but also reveals key effects that may explain the large scatter typically observed about the scaling. Electron Cyclotron Heating 2 (ECH) close to the plasma edge was used to raise electron temperatures at the pedestal top and lower collisionality to ITER level, while the power of Neutral Beam Injection (NBI) was decreased during discharges to operate closer todoi:10.1088/1741-4326/aace92 fatcat:xmgcguaa6ncxxesxpwovd2zuou