10.7910/DVN/EGVIGL P.J. Catto, F.I. Parra, I. Pusztai Harvard Dataverse 2018 Physics electromagnetic perturbations spatial perturbations turbulence zonal flow zonal flow residual calculation 2018-12-07 10.7910/DVN/EGVIGL/YFXTBT 263371 application/pdf 1.0 Custom terms specific to this dataset The collisionless axisymmetric zonal flow residual calculation for a tokamak plasma is generalized to include electromagnetic perturbations. We formulate and solve the complete initial value zonal flow problem by retaining the fully self-consistent axisymmetric spatial perturbations in the electric and magnetic fields. Simple expressions for the electromagnetic test of the zonal flow residual in gyrokinetic codes. Unlike the electrostatic potential, the parallel vector potential and the parallel magnetic field perturbations need not relax to flux functions for all possible initial conditions. <a href="http://library.psfc.mit.edu/catalog/reports/2010/17ja/17ja013/abstract.php">PSFC REPORT PSFC/JA-17-13</a><br /><br />This work was supported by US Department of Energy, Chicago, Grant Number DE-FG02-91ER54109.