Long-lasting core coherent Modes in TJ-II stellarator plasmas (original) (raw)

Long-lasting coherent modes (CCMs) have been investigated in TJ-II stellarator plasmas, particularly those related to the q=1 surface. Observations indicate that these modes, characterized by frequencies between 4 kHz and 15 kHz, display varied behavior depending on plasma conditions and configurations. Key findings include the sensitive nature of CCMs to heating methods and their insensitivity to profile relaxations, highlighting their unique characteristics in comparison to similar modes in tokamak plasmas. The implications of this research could enhance understanding of plasma stability and behavior in fusion devices.