Enhanced resonant acceleration of electrons from intense laser interaction with density-attenuating plasma

Niu, H. Y.; He, X. T.; Zhou, C. T.; Qiao, Bin
January 2009
Physics of Plasmas;Jan2009, Vol. 16 Issue 1, pN.PAG
Academic Journal
An enhanced resonant acceleration scheme for electrons by intense circularly polarized laser pulse in a plasma with slowly attenuating density is proposed. As it propagates, the phase velocity and Doppler-shifted frequency of the laser both gradually decrease, so that the electrons moving in the combined laser and spontaneous fields can retain betatron resonance for a rather long time and effectively acquire energy from the laser. The theoretical analysis is verified by test-particle numerical calculations. It is shown that well-collimated GeV electron beams with very low beam divergence can be produced.


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