Sawtooth Stabilization by Beam Ions.^1

Details Sawtooth Stabilization by Beam Ions.^1 Sawtooth Stabilization by Beam Ions.^1

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dpphp1013g&link_type=abstract

American Physical Society, 42nd Annual Meeting of the APS Division of Plasma Physics combined with the 10th International Congre

Physics

Plasma Physics

Scientific paper

Thefootnotetext[1]This work is supported by US DoE contract DE-AC02-76-CHO-3073. sawtooth stabilization by NBI ions is not clearly understood, since NBI ions are usually not ``fast'' enough to stabilise the ( m=1 ) internal kink mode which is believed to cause the sawtooth crash. The internal kink ( m=1 ) mode stability is modelled using two versions of the code NOVA and the code M3D. The NOVA-K version includes fast ion finite orbit width and Larmor radius effects in evaluating the kinetic contribution from the various fast particle groups to the MHD quadratic form of the mode energy. The NOVA-2 code is a non-perturbative code, which calculates the mode structure with fast particles included in the quadratic form. M3D is a non-linear code, used here in the linear regime with fast particles included. The three codes were benchmarked and produce good agreement for one baseline tokamak equilibrium. We also analyse JET ELM-free Deuterium and Deuterium-Tritium (DT) and TFTR plasmas with inly NBI. In addition, we have introduced plasma sheared rotation in calculations. With rotation included, the evaluated NBI ion contribution to the quadratic form of the ( m=1 ) mode stabilize this mode, in qualitative agreement with observations of long sawtooth periods in JET high performance plasmas.

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