Abstract
Abstract—By means of particle-in-cell numerical simulations, we find the possibility of the formation andlong-term coexistence of orthogonal current structures in adjacent layers of an inhomogeneous cold plasmapenetrated by a hot electron flow. The formationof these structures is shown to occur in a wide range ofparameters specifying collisionless expansion of high-energy electrons out of a dense plasma into a rarefiedplasma. These structures originate due to the development of Weibel instabilities of two different types thatare associated with qualitatively different anisotropic electron velocity distributions. Experiments with a laserplasma produced in the course of target ablation by means of quasi-cylindrical focusing of a high-power femtosecond-laser radiation beam are proposed in order to observe the predicted phenomenon
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