Investigation of High-Frequency mode activity in the HBT-EP Tokamak*

High-frequency transient mode activity in tokamaks, like the High Beta Tokamak - Extended Pulse (HBT-EP), can be excited by instabilities and are often associated with minor and major disruption events. Previous HBT-EP observations have focused on lower-frequency modes by applying digital low-pass filters to multiple plasma diagnostics, including magnetic sensor arrays, X-ray detector arrays, and scrape-off-layer (SOL) tiles. In this presentation, we instead use high-frequency filters to separate the high-frequency activity from the lower-frequency modes. We find the most intense high-frequency magnetic activities occur in brief mode bursts associated with strong plasma perturbations caused by large amplitude low-frequency modes. We present a correlation analysis for characterizing these high-frequency mode bursts from multiple diagnostics and determine the spatial, as well as temporal, dynamics for these bursts in the HBT-EP.