Pullback transformation in gyrokinetic electromagnetic simulations

It is shown that a considerable improvement in the global gyrokinetic electromagnetic simulations can be achieved by a slight modification of the simulation scheme. The new scheme is verified, simulating a Toroidal Alfv'en Eigenmode in tokamak geometry at low perpendicular mode numbers, the so-called “MHD limit”. Also, an electromagnetic drift mode has been successfully simulated in a stellarator.