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

Journal Article · Sat Feb 01 04:00:00 EST 1992 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860287· OSTI ID:5130752

Yu, C X; Brower, D L; Zhao, S J; Peebles, W A; Luhmann, Jr, N C ^[1]; Bravenec, R V; Chen, J Y; Lin, H; Ritz, C P; Schoch, P M; Yang, X Z ^[2]

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1. Department of Electrical Engineering and Institute of Plasma and Fusion Research, University of California, Los Angeles, California 90024 (United States)
2. Fusion Research Center, The University of Texas at Austin, Austin, Texas 78712 (United States)

Modifications to the spectrum and magnitude of turbulent density fluctuations in the Texas Experimental Tokamak (TEXT) (Plasma Phys. Controlled Fusion {bold 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., {ital 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 {bold E}{times}{bold 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.

• DOE Contract Number: FG03-86ER53225; FG05-88ER53267
• OSTI ID: 5130752
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 4:2; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related 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
FAR INFRARED RADIATION
FLUCTUATIONS
INFRARED RADIATION
INTERFEROMETRY
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC ISLANDS
PLASMA CONFINEMENT
PLASMA DENSITY
RADIATIONS
SPECTRAL SHIFT
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TURBULENCE
VARIATIONS