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== Background == | == Background == | ||
The goal of the proposal is to find ECRH launching configurations for which the amplitude of | |||
NBI-driven Alfvén Eigenmodes (AEs) is mitigated. Many different scenarios making use of different "control" parameters | |||
have already been tested in past experimental sessions, showing always strong changes in AEs activity. | |||
Plasma density variations and changes of the rotational transform profile due to the | |||
many contributions to the total plasma current (NBCD, ECCD, Bootstrap current) are the parameters | |||
with the higher impact. However, although inducing modifications in the general spectrum of the excited modes, | |||
none of the investigated scenarios show a clear possibility to suppress AEs without inducing large | |||
changes in plasma parameters. In this particular case we intend to investigate the effect of off-axis ECCD at different | |||
plasma radius. | |||
In this particular case we intend to investigate the effect of off-axis ECCD at different | |||
plasma radius. The heating power set-up shown in figure 1 will allows us to investigate the effect of ECCD with different combinations of power and ECCD efficiency. Studies of coupling between NBI-driven AEs and low frequency zonal flows will benefit from scenario in which AEs activity can be altered without inducing large changes in plasma conditions. | plasma radius. The heating power set-up shown in figure 1 will allows us to investigate the effect of ECCD with different combinations of power and ECCD efficiency. Studies of coupling between NBI-driven AEs and low frequency zonal flows will benefit from scenario in which AEs activity can be altered without inducing large changes in plasma conditions. | ||
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