Cryogenic Shell Pellets for Inside-Out Mitigation
2025 Research Campaign, Disruption Mitigation
Purpose of Experiment
The purpose of this experiment is to experimentally quantify the use of cryogenic shell pellets (CSP) for disruption mitigation. This novel mitigation technique aims to release radiating impurities into the plasma core by encapsulating them within a minimally radiating shell that burns through as it travels deeper into the plasma. Simulations of this mitigation technique show favorable metrics for the avoidance of runaway electron mitigation such as a slow thermal quench, high radiation fraction of the plasma’s stored energy, and MHD activity continuing through the first half of the current quench [1]. This experiment would be the first demonstration of CSP and will be compared to existing SPI and massive gas injection (MGI) datasets on DIII-D.