Current-density fluctuations and ambipolarity of transport

Journal Article · Mon Mar 02 00:00:00 EST 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.68.1319· OSTI ID:7205636

Shen, W; Dexter, R N; Prager, S C ^[1]

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1. University of Wisconsin Madison, Madison, Wisconsin 53706 (United States)

The fluctuation in the plasma current density is measured in the MST reversed-field-pinch experiment. Such fluctuations, ad the measured radial profile of the {ital k} spectrum of magnetic fluctuations, support the view that low-frequency fluctuations ({ital f}{lt}30 kHz) are tearing modes and high-frequency fluctuations (30 kHz{lt}{ital f}{lt}250 kHz) are localized turbulence in resonance with the local equilibrium magnetic field (i.e., {bold k}{center dot}{bold B}=0). Correlation of current-density and magnetic fluctuations ({l angle}{ital {tilde j}}{sub {parallel}}{ital {tilde B}{ital r}}{r angle}) demonstrates that radial particle transport from particle motion parallel to a fluctuating magnetic field is ambipolar over the full frequency range.

• OSTI ID: 7205636
• Journal Information: Physical Review Letters; (United States), Vol. 68:9; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA
FLUCTUATIONS
REVERSE-FIELD PINCH
PLASMA DIAGNOSTICS
AMBIPOLAR DIFFUSION
CURRENT DENSITY
EQUILIBRIUM
EXPERIMENTAL DATA
MAGNETIC FIELDS
RESONANCE
TEARING INSTABILITY
TIME DEPENDENCE
TURBULENCE
DATA
DIFFUSION
INFORMATION
INSTABILITY
NUMERICAL DATA
PINCH EFFECT
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
VARIATIONS
700340* - Plasma Waves
Oscillations
& Instabilities- (1992-)
700320 - Plasma Diagnostic Techniques & Instrumentation- (1992-)