Abstract
Kinetic effects associated with the nonlinear electromagnetic drift mode are studied using the drift-kinetic description for electrons and fluid ions. We construct a fully nonlinear stationary solution which represents a quasi three-dimensional chain of electron holes. The localization of the electron holes in the perpendicular direction arises from their coupling with the sheared magnetic field via hydrodynamic vortical motion. This stationary structure is enabled by the removal of the sources of both the linear and nonlinear collisionless magnetic reconnection instabilities. The linear stability is achieved by setting up a plateau in the electron distribution function followed by the trapping and consecutive depletion of resonant particles. Likewise, the nonlinear stability is realized by the short-circuiting of singular current layers by the electron gyrations. This new coherent structure is expected to play an important role in collisionless reconnection in toroidal plasma experiments.
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