One of the main purposes of the Alfvén Eigenmodes (AEs) [1] studies on JET is to validate the existing theoretical models and identify the dominant damping mechanisms for global AEs, with the aim to obtain accurate predictions for future burning plasma experiments. As an example of this work, the dependence of the measured damping rate upon the normalized Larmor radius has been analyzed in the conventional tokamak scenario, with a monotonic q-profile, to test the predictions of the NOVA-K code [2]. The AE stability properties have been studied in the presence of the fast ion drive provided by resonant Neutral Beam Injected (NBI) ions with velocities |u||NBI| uA. We have investigated the role of the high central safety factor, q0 2, on the AE stability in the advanced tokamak regimes, such as the JET Reversed Shear (RS) experiments with non-monotonic q-profile and internal transport barriers, where the ion diamagnetic drift frequency approaches the AE frequency, w*i / wTAE 2nq2r*2 (Rwpi / c) and w*i / wAE > 0.1.