  Dynamic mitigation is presented for filamentation instability and magnetic
reconnection in a plasm driven by a wobbling electron sheet current. The
wobbling current introduces an oscillating perturbation and smooths the
perturbation. The sheet current creates an anti-parallel magnetic field in
plasma. The initial small perturbation induces the electron beam filamentation
and the magnetic reconnection. When the wobbling or oscillation motion is added
to the sheet electron beam along the sheet current surface, the perturbation
phase is mixed and consequently the instability growth is delayed remarkably.
Normally plasma instabilities are discussed by the growth rate, because it
would be difficult to measure or detect the phase of the perturbations in
plasmas. However, the phase of perturbation can be controlled externally, for
example, by the driver wobbling motion. The superimposition of perturbations
introduced actively results in the perturbation smoothing, and the instability
growth can be reduced, like feed-forward control.
