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The influence of the self-consistent mode structure on the Coriolis pinch effect
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Peeters, A. G., Angioni, C., Camenen, Y., Casson, F. J. (Francis James), Hornsby, W. A., Snodin, A. P. and Strintzi, D. (2009) The influence of the self-consistent mode structure on the Coriolis pinch effect. Physics of Plasmas, Vol.16 (No.6). Article no. 062311. doi:10.1063/1.3124133 ISSN 1070-664X.
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Official URL: http://dx.doi.org/10.1063/1.3124133
Abstract
This paper discusses the effect of the mode structure on the Coriolis pinch effect [A. G. Peeters, C. Angioni, and D. Strintzi, Phys. Rev. Lett. 98, 265003 (2007)]. It is shown that the Coriolis drift effect can be compensated for by a finite parallel wave vector, resulting in a reduced momentum pinch velocity. Gyrokinetic simulations in full toroidal geometry reveal that parallel dynamics effectively removes the Coriolis pinch for the case of adiabatic electrons, while the compensation due to the parallel dynamics is incomplete for the case of kinetic electrons, resulting in a finite pinch velocity. The finite flux in the case of kinetic electrons is interpreted to be related to the electron trapping, which prevents a strong asymmetry in the electrostatic potential with respect to the low field side position. The physics picture developed here leads to the discovery and explanation of two unexpected effects: First the pinch velocity scales with the trapped particle fraction (root of the inverse aspect ratio), and second there is no strong collisionality dependence. The latter is related to the role of the trapped electrons, which retain some symmetry in the eigenmode, but play no role in the perturbed parallel velocity.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Physics of Plasmas | ||||
| Publisher: | American Institute of Physics | ||||
| ISSN: | 1070-664X | ||||
| Official Date: | June 2009 | ||||
| Dates: |
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| Volume: | Vol.16 | ||||
| Number: | No.6 | ||||
| Number of Pages: | 8 | ||||
| Page Range: | Article no. 062311 | ||||
| DOI: | 10.1063/1.3124133 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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