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Turbulent impurity transport modeling for Alcator C-Mod

Published online by Cambridge University Press:  03 June 2013

X. R. FU ,
W. HORTON ,
I. O. BESPAMYATNOV ,
W. L. ROWAN ,
S. BENKADDA ,
C. L. FIORE ,
S. FUTATANI  and
K. T. LIAO
X. R. FU
Affiliation:
Institute for Fusion Studies, The University of Texas at Austin, Austin, TX 78712, USA (xrfu@utexas.edu)
W. HORTON
Affiliation:
Institute for Fusion Studies, The University of Texas at Austin, Austin, TX 78712, USA (xrfu@utexas.edu) Mediterranean Institute of Advanced Research, Aix Marseille Université, Marseille, France
I. O. BESPAMYATNOV
Affiliation:
Institute for Fusion Studies, The University of Texas at Austin, Austin, TX 78712, USA (xrfu@utexas.edu)
W. L. ROWAN
Affiliation:
Institute for Fusion Studies, The University of Texas at Austin, Austin, TX 78712, USA (xrfu@utexas.edu)
S. BENKADDA
Affiliation:
Aix-Marseille Université, CNRS, PIIM UMR7345, Campus St Jérôme Case 321, 13397, Marseille Cedex 20, France
C. L. FIORE
Affiliation:
MIT Plasma Science and Fusion Center, Cambridge, MA 02139, USA
S. FUTATANI
Affiliation:
Institute for Fusion Studies, The University of Texas at Austin, Austin, TX 78712, USA (xrfu@utexas.edu)
K. T. LIAO
Affiliation:
Institute for Fusion Studies, The University of Texas at Austin, Austin, TX 78712, USA (xrfu@utexas.edu)
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Abstract

Turbulent particle transport is investigated with a quasilinear theory that is motivated by the boron impurity transport experiments in the Alcator C-Mod. Eigenvalue problems for sets of reduced fluid equations for multi-component plasmas are solved for the self-consistent fluctuating field vectors composed of the electric potential φ, the main ion density δni, the impurity density δnz and the ion temperature fluctuation δTi. For Alcator C-Mod parameters, we investigate two drift wave models: (1) the density-gradient-driven impurity drift wave and (2) the ion-temperature-gradient-driven ion temperature gradient (ITG) mode. Analytic and numerical results for particle transport coefficients are derived and compared with the transport data and the neoclassical theory. We explore the ability of the model to explain impurity density profiles in three confinement regimes: H-mode, I-mode and internal transport barrier (ITB) regime in C-Mod. Related experiments reported on the Large Helical Device are briefly discussed.

Type
Papers
Information
Journal of Plasma Physics , Volume 79 , Issue 5 , October 2013 , pp. 837 - 846
Copyright
Copyright © Cambridge University Press 2013 

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