Abstract
We demonstrate that shear, , governs the dynamics of the cross phase of the peeling-ballooning-(PB-)mode-driven heat flux, and so determines the evolution from the edge-localized (ELMy) mode to the quiescent () mode. A physics-based scaling of the critical shearing rate () for accessing the mode is predicted. The ELMy mode to the -mode evolution is shown to follow from the conversion from a phase locked state to a phase slip state. In the phase locked state, PB modes are pumped continuously, so bursts occur. In the slip state, the PB activity is a coherent oscillation. Stronger shearing implies a higher phase slip frequency. This finding predicts a new state of cross phase dynamics and shows a new way to understand the physics mechanism for ELMy to the -mode evolution.
- Received 17 December 2014
DOI:https://doi.org/10.1103/PhysRevLett.114.145002
© 2015 American Physical Society