The connection between impurity ion heating and other physical processes in the plasma is evaluated by studying variations in the amount of ion heating at reconnection events in the Madison Symmetric Torus (MST). Correlation of the change in ion temperature with individual tearing mode amplitudes indicates that the edge-resonant modes are better predictors for the amount of global ion heating than the core-resonant modes. There is also a strong correlation between ion heating and current profile relaxation. Simultaneous measurements of the ion temperature at different toroidal locations reveal, for the first time, a toroidal asymmetry to the ion heating in MST. These results present challenges for existing heating theories and suggest a stronger connection between edge-resonant tearing modes, current profile relaxation, and ion heating than has been previously thought.
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January 2014
Research Article|
January 15 2014
Statistical analysis of variations in impurity ion heating at reconnection events in the Madison Symmetric Torus
M. S. Cartolano;
M. S. Cartolano
1
Wheaton College
, Wheaton, Illinois 60187, USA
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D. Craig;
D. Craig
a)
1
Wheaton College
, Wheaton, Illinois 60187, USA
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D. J. Den Hartog;
D. J. Den Hartog
2
University of Wisconsin-Madison
, Madison, Wisconsin 53706, USA
3Center for Magnetic Self-Organization in Laboratory and Astrophysical Plasmas, Madison, Wisconsin 53706,
USA
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S. T. A. Kumar;
S. T. A. Kumar
2
University of Wisconsin-Madison
, Madison, Wisconsin 53706, USA
3Center for Magnetic Self-Organization in Laboratory and Astrophysical Plasmas, Madison, Wisconsin 53706,
USA
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M. D. Nornberg
M. D. Nornberg
2
University of Wisconsin-Madison
, Madison, Wisconsin 53706, USA
3Center for Magnetic Self-Organization in Laboratory and Astrophysical Plasmas, Madison, Wisconsin 53706,
USA
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a)
Electronic mail: darren.craig@wheaton.edu
Phys. Plasmas 21, 012510 (2014)
Article history
Received:
August 13 2013
Accepted:
December 17 2013
Citation
M. S. Cartolano, D. Craig, D. J. Den Hartog, S. T. A. Kumar, M. D. Nornberg; Statistical analysis of variations in impurity ion heating at reconnection events in the Madison Symmetric Torus. Phys. Plasmas 1 January 2014; 21 (1): 012510. https://doi.org/10.1063/1.4861254
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