Access conditions and performance optimization of I-mode with strong shaping enabled by SVR
2025 Research Campaign, Pedestal and Non/Small ELM Regimes
Purpose of Experiment
The I-mode confinement regime is one of several stationary high confinement regimes being studied for future fusion devices. Its attractive features include having high particle confinement, reducing impurity accumulation, and no periodic edge instabilities (ELMs) which can damage the vessel components. Previous experiments in 2022 found it could be extended to unusually high power using a new highly shaped configuration with good pumping.
Experimental Approach
Planned experiments in 2025 will explore this further, using an even more highly shaped configuration enabled by the DIII-D Shape and Volume Rise upgrade. We will vary the density and power to map out access conditions and energy confinement and make detailed fluctuation measurements.
See more details, including project leads, at U.S. Department of Energy, Office of Scientific and Technical Information (OSTI).