Direct Laser-Driven Electron Acceleration and Energy Gain in Helical Beams

Figure 5

The logarithmic scale histogram of net energy gained and the polar angle histogram of electrons after interaction with a circularly polarized laser pulse with  fs, beam waist, and  PW power. (a0, b0) The energy gained from a Gaussian pulse and the corresponding angular distribution of electrons. (a1, b1) The energy gain and angular distribution in case of the helical beam, for helical beams (a2, b2) and (a3, b3), and for helical beams (a4, b4) and (a5, b5).