Reversed shear Alfvén eigenmodes associated with the ellipticity and triangularity Alfvén gaps

Details Reversed shear Alfvén eigenmodes associated with the ellipticity and triangularity Alfvén gaps Reversed shear Alfvén eigenmodes associated with the ellipticity and triangularity Alfvén gaps

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ppcf...48.1285k&link_type=abstract

Plasma Physics and Controlled Fusion, Volume 48, Issue 9, pp. 1285-1295 (2006).

Physics

Plasma Physics

6

Scientific paper

Based on numerical simulations with the magnetohydrodynamic code NOVA, reversed shear Alfvén eigenmodes (RSAE) associated with the ellipticity-induced and non-circular triangularity-induced Alfvén eigenmode gaps were found. An analytical model for large aspect ratio plasmas confirms the existence of those modes with a pressure gradient threshold that agrees very well with the NOVA calculations. It is predicted that these higher gap RSAEs might be observed in existing large tokamaks in the early phase of reversed shear discharges when the minimum value of the magnetic safety factor is high (larger than two) and in ITER advanced scenario discharges.

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