High and low frequency Alfven modes in tokamaks

S. Briguglio, L. Chen, Jiaqi Dong, G. Fogaccia, R.A. Santoro, G. Vlad, F. Zonca

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Abstract

An analysis of the typical features of shear Alfven waves in tokamak plasmas in a frequency domain ranging from the high frequencies of the toroidal gap to the low frequencies is presented. The frequencies are comparable with the thermal ion diamagnetic frequency ω-*pi$/ and/or the thermal ion transit frequency ω-ti$/ = vti/qR0 where vti is the ion thermal speed. Line bending can explain the finite β stabilization of the electrostatic ITG. For increasing α (β), the coupling to the electromagnetic shear Alfven branch also increases while the stabilizing influence of line bending diminishes. As a consequence, the stabilizing influence of the electrostatic ITG is expected to be strongest somewhere between α = 0 and α = αcrit.
Original languageEnglish
Pages (from-to)701 - 706
Number of pages6
JournalNuclear Fusion
Volume40
Issue numberSPEC. ISS. 3
DOIs
Publication statusPublished - 2000
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Nuclear and High Energy Physics

Cite this

Briguglio, S., Chen, L., Dong, J., Fogaccia, G., Santoro, R. A., Vlad, G., & Zonca, F. (2000). High and low frequency Alfven modes in tokamaks. Nuclear Fusion, 40(SPEC. ISS. 3), 701 - 706. https://doi.org/10.1088/0029-5515/40/3Y/334