Self-induced magnetic focusing of proton beams by Weibel-like instability in the laser foil-plasma interactions

Yan, X. Q.; Chen, M.; Sheng, Z. M.; Chen, J. E.
April 2009
Physics of Plasmas;Apr2009, Vol. 16 Issue 4, p044501
Academic Journal
In the laser foil-plasma interaction the effects of Weibel-like instability have been explored. The self-induced magnetic fields result in the merging of filaments formed at the earlier stage of the instability and subsequent formation of a plasma clump close to the laser propagation axis. A photon cavity is formed in the laser plasma interactions, which can accelerate and focus the proton bunch efficiently, as identified by multidimensional particle-in-cell simulations. These processes are helpful to realize the stable acceleration of hundreds of MeV proton beams with a very low energy spread with circularly polarized intense laser pulses.


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