The generation of azimuthal magnetic field in laser-induced plasma bubbles

Zhou, Suyun; Yu, Wei; Yuan, Xiao; Xu, Han; Wang, Xin; Ma, Guangjing
November 2010
Physics of Plasmas;Nov2010, Vol. 17 Issue 11, p113101
Academic Journal
A two-dimensional (2D) analytical model for a laser-induced bubble is rebuilt by taking into account the generation of azimuthal magnetic field. It is shown that the azimuthal magnetic field surrounds the bubble transversely, whose amplitude peaks at the bubble edge and vanishes at laser axis. In a laser wakefield acceleration scheme, the longitudinal electric field accelerates the electrons injected from the rear of the bubble, while the azimuthal magnetic field makes the resulting energetic-electron beam converge. The analytical model is justified by a 2D Particle in Cell (PIC) simulation.


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