Issue date: April 2016
Banerjee, S., A. Diallo, & S.J. Zweben. (2016). Observation of quasi-coherent edge fluctuations in Ohmic plasmas on NSTX [Data set]. Princeton Plasma Physics Laboratory, Princeton University.
A quasi-coherent mode with frequency f = 40 kHz is observed in Ohmic plasmas in NSTX with the gas puff imaging diagnostic (GPI). This mode is located predominantly just inside the separatrix, with a maximum fluctuation amplitude similar to that of the broadband turbulence in the same frequency range. The quasi-coherent mode has a poloidal wavelength 16 cm and a poloidal velocity 49 km/s in the electron diamagnetic direction, which are similar to the characteristics expected from a linear drift-wave like mode in the edge.Show More