Studies of impurity mode and ion temperature gradient mode in toroidal plasmas

Journal Article · Fri Sep 01 04:00:00 EDT 1995 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871123· OSTI ID:115895

Dong, J Q ^[1]; Horton, W ^[2]

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1. Southwestern Institute of Physics, P.O. Box 432, Chengdu, Sichuan 610041 (China)
2. Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712 (United States)

The impurity mode and {eta}{sub {ital i}} mode driven by impurity ions with outwardly peaked density profiles, near the boundary of tokamak plasmas, and the ion temperature gradient, respectively, are studied in high-temperature toroidal plasmas. The gyrokinetic theory is applied and finite Larmor radius effects of both hydrogenic and impurity ions are included. It is found that the impurity mode is enhanced by the ion temperature gradient. In addition, the impurity ions with outwardly peaked density profiles are demonstrated to have destabilizing effects on the {eta}{sub {ital i}} mode. These two modes are strongly coupled to each other so that it is impossible to distinguish between them when both the driving mechanisms are strong enough to drive the corresponding mode unstable independently. The correlation of the results with nonlinear simulations and the experimental observations are discussed. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

• Research Organization: University of Texas
• DOE Contract Number: FG05-80ET53088
• OSTI ID: 115895
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 9 Vol. 2; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
HOT PLASMA
HYDROGEN IONS
ION DENSITY
ION TEMPERATURE
LARMOR RADIUS
PLASMA IMPURITIES
TOKAMAK DEVICES