Nonlinear theory of trapped electron temperature gradient driven turbulence in flat density H-mode plasmas

Technical Report · Sat Dec 01 04:00:00 EST 1990

DOI:https://doi.org/10.2172/6309638· OSTI ID:6309638

Hahm, T S

Ion temperature gradient turbulence based transport models have difficulties reconciling the recent DIII-D H-mode results where the density profile is flat, but {chi}{sub e} > {chi}{sub i} in the core region. In this work, a nonlinear theory is developed for recently discovered ion temperature gradient trapped electron modes propagating in the electron diamagnetic direction. This instability is predicted to be linearly unstable for L{sub Ti}/R {approx lt} {kappa}{sub {theta}}{rho}{sub s} {approx lt} (L{sub Ti}/R){sup 1/4}. They are also found to be strongly dispersive even at these long wavelengths, thereby suggesting the importance of the wave-particle-wave interactions in the nonlinear saturation phase. The fluctuation spectrum and anomalous fluxes are calculated. In accordance with the trends observed in DIII-D, the predicted electron thermal diffusivity can be larger than the ion thermal diffusivity. 17 refs., 3 figs.

• Research Organization: Princeton Univ., NJ (USA). Plasma Physics Lab.
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 6309638
• Report Number(s): PPPL-2734; ON: DE91005995
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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CONFINEMENT
DOUBLET REACTORS
ELECTRON TEMPERATURE
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
FLUCTUATIONS
H-MODE PLASMA CONFINEMENT
ION TEMPERATURE
LEPTONS
NONLINEAR PROBLEMS
PHYSICAL PROPERTIES
PLASMA CONFINEMENT
TEMPERATURE GRADIENTS
THERMAL DIFFUSIVITY
THERMODYNAMIC PROPERTIES
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
TRAPPED ELECTRONS
TURBULENCE
VARIATIONS