Pushforward Transformation Of Gyrokinetic Moments Under Electromagnetic Fluctuations

Pushforward transformation is one of the two important transformations in modern nonlinear gyrokinetic theory. In this work, a gyrokinetic system under electromagnetic fluctuations has been derived using a purely pushforward transformation, where the finite Larmor radius (FLR) effect is fully retained. From the perspective of polarization and magnetization, clear physical pictures of macroscopic equilibrium flow are presented, and the generation of macroscopic perturbed flow is discussed with the incorporation of the full FLR effect using the systematical analysis of the gyrocenter gyroradius and the decoupling of particle velocity. Published by AIP Publishing.