10.11578/1474184
Banerjee, S
Diallo, A
Zweben, S
Observation of quasi-coherent edge fluctuations in Ohmic plasmas on NSTX
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
2016
en
Turbulence
1474184
AC02-09CH11466
None
Specialized Mix
10.1063/1.4946871
doi: 10.1063/1.4946871
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.