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The dependence of the damping rate of medium-n toroidal Alfvén eigenmodes on the edge plasma elongation in JET
Testa, Duccio ...
This paper reports the first quantitative analysis of the measurements of the damping rate (ŽžŽ) for stable Alfvén eigenmodes (AEs) with toroidal mode number (n) in the range |n| = 3-15 as a function ...of the edge plasma elongation(Ž95). We find that the damping rate ŽžŽ versus Ž95 for medium-n toroidal AEs (TAEs), with n = 3 and n = 7, increases for increasing elongation, i.e. its scaling versus Ž95 follows the same trend previously measured and explained theoretically for the n = 1 and n = 2 TAEs. Theoreticalanalysis of the measurements for the n = 3 TAEs has been performed using the LEMan code. The results are in good agreement (within a factor of two) for all the magnetic configurations where there is only a very minor upždown asymmetry in the poloidal cross-section of the plasma. These experimental results further confirm the possibility of using the edge shape parameters as a real-time actuator for control of the stability of alpha-particle driven AEs in burning plasma experiments, such as ITER.
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