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Plasma Physics (Physics/ECE/NE 922) Seminar
Initial Results from the DIII-D Negative Triangularity Campaign
Date: Monday, May 1st
Time: 12:00 pm
Place: 2241 Chamberlin Hall
Speaker: Kathreen Thome, General Atomics
Abstract: Negative Triangularity (NT) is a potentially transformative scenario for fusion energy with its high-performance core, L-mode-like edge, and low-field-side divertors that could readily scale to an integrated reactor solution free of ELMs. Benefits of the NT shape were originally demonstrated on the TCV tokamak and high-performance has been previously achieved on DIII-D, which motivated the installation of graphite-tile armor on the low-field-side lower outer wall to attain high-power diverted plasmas with strong negative triangularity. In early 2023, a dedicated multiple-week experimental campaign was conducted to qualify the NT scenario for future reactors. During this campaign, high confinement (H98y,2≥1), high current (q95<3), and high normalized pressure plasmas (βN~3) were achieved at high-injected-power in strongly NT-shaped plasmas with δavg= - 0.5 and a lower outer divertor X-point during a dedicated experimental campaign on DIII-D that also demonstrated high normalized density (ne/nGW≤2) and a detached divertor, all while maintaining a non-ELMing NT-edge. Further results on performance, stability, transport, and core-edge integration will be presented.
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