Observation of quasi-coherent edge fluctuations in Ohmic plasmas on NSTX

Dataset · Fri Apr 01 00:00:00 EDT 2016

DOI:https://doi.org/10.11578/1366985· OSTI ID:1366985

Banerjee, S. ^[1]; Diallo, A. ^[2]; Zweben, S.J. ^[2]

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1. Princeton Plasma Physics Laboratory
2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

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.

• Research Organization: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
• DOE Contract Number: AC02-09CH11466
• OSTI ID: 1366985
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Turbulence