Dynamic Stabilization of Filamentation Instability*

The paper presents a study on dynamic stabilization of filamentation instability driven by an electron beam in a plasma. The results show that the filamentation instability is stabilized by the dynamic stabilization mechanism, in which the electron beam axis oscillates. The dynamic stabilization mechanism for plasma instabilities was proposed in the paper [PoP 19, 024503 (2012)]. Instabilities emerge from the perturbations. Normally the perturbation phase is unknown so that the instability growth rate is discussed. If the perturbation phase is known, the instability growth can be controlled by a superimposition of perturbations: if the perturbation is introduced by, for example, a driving beam axis oscillation, the perturbation phase can be controlled and the instability growth is mitigated. When the electron beam axis oscillates in a plasma, the perturbations carried by the electron beam also oscillate. The superimposition of the perturbations mitigates the filamentation growth [PoP 25, 011601 (2018)].