Energetic ion transport by microturbulence is insignificant in tokamaks
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Author(s)
Pace, David C.
Austin, M. E.
Bass, E. M.
Budny, R. V.
Heidbrink, W. W.
Hillesheim, J. C.
Holcomb, C. T.
Gorelenkova, M.
Grierson, B. A.
McCune, D. C.
Date Issued
2013
Journal
Physics of Plasmas
Publisher
American Institute of Physics (AIP)
Citation
Pace, D. C., M. E. Austin, E. M. Bass, R. V. Budny, W. W. Heidbrink, J. C. Hillesheim, C. T. Holcomb, et al. “Energetic Ion Transport by Microturbulence Is Insignificant in Tokamaks.” Phys. Plasmas 20, no. 5 (2013): 056108.
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Final published version
Abstract
Energetic ion transport due to microturbulence is investigated in magnetohydrodynamic-quiescent plasmas by way of neutral beam injection in the DIII-D tokamak [J. L. Luxon, Nucl. Fusion 42, 614 (2002)]. A range of on-axis and off-axis beam injection scenarios are employed to vary relevant parameters such as the character of the background microturbulence and the value of Eb/Te , where Eb is the energetic ion energy and Te the electron temperature. In all cases, it is found that any transport enhancement due to microturbulence is too small to observe experimentally. These transport effects are modeled using numerical and analytic expectations that calculate the energetic ion diffusivity due to microturbulence. It is determined that energetic ion transport due to coherent fluctuations (e.g., Alfvén eigenmodes) is a considerably larger effect and should therefore be considered more important for ITER.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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DOI of Published Version
https://doi.org/10.1063/1.4803930
