Role of Poloidal E ×B Convection on Divertor Heat Transport in DIII-D
Abstract
Simulations for DIII-D high confinement mode plasmas with the fluid code UEDGE show a strong role of poloidal E × B drifts on the divertor heat transport. These findings challenge the paradigm of conduction-limited scrape-off layer (SOL) transport, which is a standard assumption in analytic calculations of divertor power exhaust, such as in. While simulations without drifts are well aligned with this assumption, simulations with drifts show that the poloidal E × B flow dominates the divertor heat transport in both attached and detached conditions. This study has identified, for the first time, the important contribution of E × B drifts to the strong convective heat flow in detached conditions in DIII-D previously reported in. The impact of the convective E × B flows on the radiated power density scaling in the divertor will also be discussed.
Work supported by US DOE under DE-FC02-04ER54698, DE-AC52-07NA27344, and LLNL LDRD project 17-ERD-020.- Publication:
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APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..DPPJO5012J