Predicting and Optimizing the Pedestal in Present and Future Tokamaks
Abstract
The pressure and temperature at the top of the pedestal play a key role in fusion performance of tokamaks. We review comparisons of pedestal predictions with the EPED model to observations on several tokamaks, focusing on high pedestal regimes such as Super H Mode. The role of both plasma shaping and aspect ratio is studied in detail, noting that even small changes to aspect ratio and shape can have profound implications for access to high pedestal states. Updates to the EPED model are discussed, addressing generalizations of the model and numerical and formulational challenges specific to lower aspect ratio devices. Predictions for DIII-D, JET, and MAST-U are discussed, as well as pedestal optimization for next step devices such as a Sustained High Power Density device and Compact Pilot Plant.
Work supported by US DOE under DE-FG02-95ER54309, DE-FC02-04ER54698, DE-FC02-06ER54873, DE-SC0018990, DE-SC0014264.- Publication:
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APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..DPPG10063S