Optimization of Multiple D2 SPI for Two-Staged Plasma Mitigation
2025 Research Campaign, Disruption Mitigation
Purpose of Experiment
This experiment focuses the physics behind the first stage in a staggered mitigation scheme, firing D2 shattered pellet injection (SPI) then D2/Ne SPI, on ITER. This injection scheme is favorable compared to injection of multiple D2/Ne SPI simultaneously due to the increased runaway electron avoidance (high density, dilution cooling lowers energy of initial RE seed). The goal of this experiment would be to find the best scheme for multiple D2 SPI to increase assimilation and get the fragments through the hot edge of the plasma.