Comparison of the density fluctuation spectrum and amplitude in TEXT with expectations for electron drift waves

• Published in: Physics of fluids. B, Plasma physics Plasma physics, 1992-02, Vol.4 (2), p.381-385
• Main Authors: Yu, C. X., Brower, D. L., Zhao, S. J., Peebles, W. A., Luhmann, N. C., Bravenec, R. V., Chen, J. Y., Lin, H., Ritz, Ch. P., Schoch, P. M., Yang, X. Z.
• Format: Article
• Language: English
• Subjects: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 700340 - Plasma Waves, Oscillations, & Instabilities- (1992-); 700350 - Plasma Production, Heating, Current Drive, & Interactions- (1992-); CLOSED PLASMA DEVICES; CONFINEMENT; DISPERSION RELATIONS; DOPPLER EFFECT; ELECTROMAGNETIC RADIATION; ELECTRON DENSITY; ELECTRON DRIFT; Exact sciences and technology; FAR INFRARED RADIATION; FLUCTUATIONS; INFRARED RADIATION; INTERFEROMETRY; Magnetic confinement and equilibrium; MAGNETIC FIELD CONFIGURATIONS; MAGNETIC ISLANDS; Physics; Physics of gases, plasmas and electric discharges; Physics of plasmas and electric discharges; PLASMA CONFINEMENT; PLASMA DENSITY; RADIATIONS; SPECTRAL SHIFT; THERMONUCLEAR DEVICES; TOKAMAK DEVICES; TURBULENCE; VARIATIONS
• ISSN: 0899-8221; 2163-503X
• DOI: 10.1063/1.860287

Modifications to the spectrum and magnitude of turbulent density fluctuations in the Texas Experimental Tokamak (TEXT) [Plasma Phys. Controlled Fusion 27, 1335 (1985)], measured by far‐infrared scattering, are related to changes in plasma profiles (e.g., density and potential) induced by naturally occurring magnetic islands (i.e., m=2) of varying amplitude. The statistical dispersion relation of the microturbulence that propagates in the electron diamagnetic drift direction is observed to be consistent with expectations for electron drift‐wave turbulence when a spectral shift due to E×B plasma rotation is included. Observed spectral widths are several times larger than the linear mode frequency. The fluctuation amplitude is found to scale inversely with the electron density scale length.