Dynamical self-focusing of high-power free electron laser radiation in a magnetized plasma

Lontano, M.; Sergeev, A. M.; Cardinali, A.
April 1989
Physics of Fluids B: Plasma Physics;Apr89, Vol. 1 Issue 4, p901
Academic Journal
Under the action of very intense free electron laser (FEL) radiation, a homogeneous plasma can manifest nonlinear behavior and dramatically change the spatial distribution of the incident electromagnetic beam. The dominant mechanism is the constriction depletion of the plasma due to an averaged ponderomotive force. The unstable character of the FEL-beam plasma system and the consequent self-focusing are studied in the dynamical ‘‘supersonic limit.’’ The self-similar structure of the high-frequency field and density distributions is computed and the form of a ‘‘trace,’’ left by a moving ‘‘focus’’ in the plasma is determined.


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