Mode structure of disruption precursors in TFTR enhanced reversed shear discharges

摘要

The mode structure of the disruption precursors in the TFTR enhanced reversed shear(ERS)parameters has been studied by using T_e fluctuation profiles and q profiles obtained from electron cyclotron emission(ECE)and motional Stark effect(MSE)measurements. The observed pro- files of the radial displacement associated with the MHD modes were consistent with the displacement profiles expected from the ideal MHD external kink mode. The observed mode frequencies differ from the plasma toroidal rotation frequency measured with C VI charge exchange recombination light. The independence of the mode frequency from the plasma rotation frequency supports the ideal MHD hypothesis. Possible causes of the frequency difference are discussed.