Abstract
Recent results of edge plasma study in spherical tokamaks (ST) are reviewed. Effect of divertor geometry on allowable steady-state power and edge localized mode (ELM) heat load to target plates were studied. Conceptual case study was made on divertor power handling in a low aspect ratio tokamak reactor. By expanding magnetic flux tube and divertor wetted area, it might be possible to handle heat load without radiative cooling in low triangularity configuration.
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