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The safe operation of most tokamaks, especially the largen sized ones, relyon the feedback control of the vertical displacement events (VDEs). However,most these feedback control systems are based on the axisymmetric VDE models.In this work, we use NIMROD simulations to study the roles of non-axisymmetricperturbations in free drift vertical displacement events on EAST. The high-$n$modes in non-axisymmetric VDE grow first, which drive the formation of high-$n$magnetic island chains. Subsequently, the magnetic island chains grow andoverlap with each other, leading to the destruction of the magnetic fluxsurface, which induces a minor disruption and accelerates the start of thefollowing major disruption. The magnetic island and the stochastic magneticfield allow the toroidally asymmetric poloidal plasma current to jet towardsthe hoop force direction, forming the finger and filamentary structures. Such aplasma current asymmetry strongly depends on the anisotropy in thermaltransport coefficients.

Roles of non-axisymmetric perturbations in free drift vertical displacement events on EAST