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A new diagnostic has been developed to investigate the wave-particleinteraction in the phase-space in gyrokinetic particle-in-cell codes. Based onthe projection of energy transfer terms onto the velocity space, the techniquehas been implemented and tested in the global code ORB5 and it gives anopportunity to localise velocity domains of maximum wave-plasma energy exchangefor separate species. Moreover, contribution of different species andresonances can be estimated as well, by integrating the energy transfer termsin corresponding velocity domains. This Mode-Plasma-Resonance (MPR) diagnostichas been applied to study the dynamics of the Energetic-particle-inducedGeodesic Acoustic Modes (EGAMs) in an ASDEX Upgrade shot, by analysing theinfluence of different species on the mode time evolution. Since the equationson which the diagnostic is based, are valid in both linear and nonlinear cases,this approach can be applied to study nonlinear plasma effects. As a possiblefuture application, the technique can be used, for instance, to investigate thenonlinear EGAM frequency chirping, or the plasma heating due to the damping ofthe EGAMs.

Implementation of energy transfer technique in ORB5 to study collisionless wave-particle interactions in phase-space