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Measurements of high frequency oscillations in JET, JT-60U, Alcator C-Mod, DIII-D and TFTR plasmas are contributing to a new understanding of fast ion driven instabilities relevant to Advanced Tokamak (AT) regimes. A model based on the transition from a cylindrical-like frequency-chirping mode to the Toroidal Alfvén Eigenmode (TAE) has successfully encompassed many of the characteristics seen in experiments. In a surprising development, the use of internal density fluctuation diagnostics hasdoi:10.2172/836089 fatcat:2zigaswtsfa6blhxdamqvmglli