Studies of impurity mode and ITG mode in toroidal plasmas

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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 ... continued below

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37 p.

Creation Information

Dong, J.Q. & Horton, W. April 1, 1995.

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  • Dong, J.Q. Southwest Inst. of Physics, Chengdu, SC (China)
  • Horton, W. Texas Univ., Austin, TX (United States). Inst. for Fusion Studies

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Description

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.

Physical Description

37 p.

Notes

INIS; OSTI as DE95012134

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  • Other Information: PBD: Apr 1995

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  • Other: DE95012134
  • Report No.: DOE/ET/53088--703
  • Report No.: IFSR--703
  • Grant Number: FG05-80ET53088
  • DOI: 10.2172/68998 | External Link
  • Office of Scientific & Technical Information Report Number: 68998
  • Archival Resource Key: ark:/67531/metadc708877

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Creation Date

  • April 1, 1995

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Aug. 10, 2016, 2:15 p.m.

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Dong, J.Q. & Horton, W. Studies of impurity mode and ITG mode in toroidal plasmas, report, April 1, 1995; Austin, Texas. (digital.library.unt.edu/ark:/67531/metadc708877/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.