ELM energy scaling in DIII-D

The energy lost from the pedestal region due to an average ELM in DIII-D is determined from changes to the electron density and temperature profiles as measured by Thomson scattering. The ELM energy due to loss of temperature in the pedestal is associated with conduction and is found to decrease with increasing pedestal density. The ELM energy from lost pedestal density, or convective transport, remains constant as a function of density. The scaling of the two transport channels, conduction and convection, are examined in terms of parallel transport processes in the scrape-off-layer and divertor.

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