Investigation of Turbulence Stabilization in Negative Triangularity Plasmas
2024 Research Campaign, Negative Triangularity
Purpose of Experiment
Core-edge integration remains an open question for future Fusion Pilot Plant (FPP) design concepts. H-mode concepts suffer from the untenable heat-loads from Edge Localized Modes (ELMs) while ELM-free designs suffer from a lack of robustness or degraded energy confinement. Negative Triangularity (NT) offers a uniquely robust ELM-free edge solution, with promising turbulence properties. Understanding the shaping effects of negative triangularity on turbulence is critical to predicting NT performance as an FPP concept. Turbulence fluctuations have been seen to be reduced in NT plasmas in TCV and DIII-D across a variety of plasma parameters. Dedicated turbulence experiments are required to isolate the stabilizing effect of negative triangularity. This experiment will seek to shed insight into how core and edge fluctuations are reduced by NT and what determines the edge performance in NT plasmas.