Studies of impurity mode and ITG mode in toroidal plasmas

Technical Report · Sat Apr 01 04:00:00 EST 1995

DOI:https://doi.org/10.2172/68998· OSTI ID:68998

Dong, J Q ^[1]; Horton, W ^[2]

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1. Southwest Inst. of Physics, Chengdu, SC (China)
2. Texas Univ., Austin, TX (United States). Inst. for Fusion Studies

The impurity mode and {eta}{sub i} mode driven by impurity ions with outwardly peaked density profiles, just as it is at 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 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 axe strong enough to drive the corresponding mode unstable independently. The correlation of the results with nonlinear simulations and the experimental observations are discussed.

• Research Organization: Texas Univ., Austin, TX (United States). Inst. for Fusion Studies
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG05-80ET53088
• OSTI ID: 68998
• Report Number(s): DOE/ET/53088--703; IFSR--703; ON: DE95012134
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
NONLINEAR PROBLEMS
PLASMA
PLASMA IMPURITIES
PLASMA RADIAL PROFILES
PLASMA SIMULATION
TEMPERATURE GRADIENTS